Bump version to 2026.7.0-beta.4

* fix(frontend): 画像の上をタップした状態でPull to Refreshを行うと画像も開かれてしまう問題を修正

* attempt to fix

* revert

* revert

.claude/THIRD_PARTY_LICENSES.md

@@ -19,7 +19,7 @@
 |---|---|---|---|
 | `skills/context-budget/SKILL.md` | `skills/context-budget/SKILL.md` | ECC | description を日本語化、Misskey 固有メモを追記 |
 | `commands/harness-audit.md` | `commands/harness-audit.md` | ECC | scripts 依存の自動採点を、Claude が `pnpm`/`git`/`grep` で手動採点する版に書き換え。Misskey 固有の評価軸 (SPDX / endpoint-list / migration / locales) を組み込み |
-| `commands/quality-gate.md` | `commands/quality-gate.md` | ECC | 言語自動判定を排除し Misskey 固定 pipeline (`pnpm` + tsgo + ESLint + Vitest) に。Prettier/Biome フェーズを削除 |
+| `commands/quality-gate.md` | `commands/quality-gate.md` | ECC | 言語自動判定を排除し Misskey 固定 pipeline (`pnpm` + tsc + ESLint + Vitest) に。Prettier/Biome フェーズを削除 |
 
 ### MIT License (full text)
 

.claude/commands/quality-gate.md

@@ -12,9 +12,9 @@ upstream path: commands/quality-gate.md
 upstream license: MIT — https://github.com/affaan-m/everything-claude-code/blob/main/LICENSE
 project-level notice: see .claude/THIRD_PARTY_LICENSES.md (Misskey 内サードパーティ一覧 + MIT 全文)
 
-Imported into Misskey .claude/ on 2026-05-10. Pipeline 概念 (lint → typecheck → test) は upstream ECC 版から借用 (MIT)。実コマンド層は Misskey の pnpm + tsgo + ESLint + Vitest に固定し、formatter (Prettier/Biome) フェーズは削除した。
+Imported into Misskey .claude/ on 2026-05-10. Pipeline 概念 (lint → typecheck → test) は upstream ECC 版から借用 (MIT)。実コマンド層は Misskey の pnpm + tsc + ESLint + Vitest に固定し、formatter (Prettier/Biome) フェーズは削除した。
 
-note: 元 ECC 版は言語自動判定 + format/lint/type のジェネリック版だったが、Misskey 専用に pnpm + tsgo + ESLint + Vitest の組み合わせに固定。重い test:e2e / test:fed は含まない (CI 側で実行される)。
+note: 元 ECC 版は言語自動判定 + format/lint/type のジェネリック版だったが、Misskey 専用に pnpm + tsc + ESLint + Vitest の組み合わせに固定。重い test:e2e / test:fed は含まない (CI 側で実行される)。
 -->
 
 # /quality-gate — Misskey 軽量品質ゲート
@@ -50,7 +50,7 @@ pnpm --filter frontend test
 lint がまとめて失敗していて typecheck の結果だけ単独で見たい場合は、以下を個別に回す。**通常は不要** (lint の出力を読めば足りる):
 
 ```bash
-pnpm --filter backend typecheck    # tsgo 単体
+pnpm --filter backend typecheck    # tsc 単体
 pnpm --filter frontend typecheck   # vue-tsc 単体 (Vue SFC の型を見るため)
 ```
 
@@ -63,7 +63,7 @@ pnpm --filter backend lint
 pnpm --filter backend test
 ```
 
-`tsgo` の出力を単独で見たい時のみ optional で `pnpm --filter backend typecheck` を別途回す。
+`tsc` の出力を単独で見たい時のみ optional で `pnpm --filter backend typecheck` を別途回す。
 
 ### Frontend scope
 

.claude/skills/working-on-backend/references/knowledge/nestjs-di.md

@@ -6,7 +6,7 @@ Misskey の backend は NestJS 11 + Fastify 5 + TypeORM 1 (PostgreSQL) + Redis
 
 - **DI コンテナ**: NestJS の `@Injectable()` サービス + Repository (TypeORM) パターン
 - **DI トークン**: [`@/di-symbols.js`](../../../../../packages/backend/src/di-symbols.ts) の `DI` から `@Inject(DI.xxx)` で注入
-- **ビルド**: `rolldown -c` で `built/` にバンドル。型チェックは `tsgo`
+- **ビルド**: `rolldown -c` で `built/` にバンドル。型チェックは `tsc`
 
 ## エンドポイント内での DI
 

.claude/skills/working-on-backend/references/tasks/adding-api-endpoint.md

@@ -236,7 +236,7 @@ pnpm --filter backend test:e2e
 ```bash
 # 個別ファイルを高速にチェック
 pnpm exec eslint --fix packages/backend/src/server/api/endpoints/<category>/<name>.ts
-pnpm --filter backend typecheck      # tsgo --noEmit (backend のみ)
+pnpm --filter backend typecheck      # tsc --noEmit (backend のみ)
 
 # 一括 (PR 提出前)
 pnpm --filter backend lint

.coderabbit.yaml

@@ -0,0 +1,34 @@
+language: "ja-JP"
+tone_instructions: "常に丁寧語（です・ます調）を用い、敬意のある表現で応答してください。人格や能力への評価、皮肉、威圧的・高圧的・命令的な表現は避けてください。指摘では問題点と影響を明確にし、理由を簡潔に説明したうえで、具体的な改善案を提案してください。不確実な事項は推測と明示し、確認を促してください。重大なバグやセキュリティ上の懸念は重要度と根拠を明確に伝えてください。"
+reviews:
+  profile: "chill"
+  high_level_summary: false
+  poem: true
+  auto_review:
+    enabled: true
+    drafts: false
+    base_branches:
+      - "develop"
+    ignore_title_keywords:
+      - "New Crowdin updates"
+    ignore_usernames:
+      - "dependabot[bot]"
+      - "renovate[bot]"
+      - "github-actions[bot]"
+  path_instructions:
+    - path: "**/*"
+      instructions: |
+        【レビュー対象外】
+        - フォーマット違反、型エラー、SPDXヘッダーの記載漏れ等、静的解析で検出可能な問題については、別Workflow（CI/CD）でチェックされるため、レビュー対象外として無視してください。
+
+        【特別な対応を要するレビュー】
+        - プルリクエストで変更されていない部分において、プルリクエストのタイトルや説明文に照らしてスコープ外であるが修正すべき点を見つけた場合は、このプルリクエストで修正させるのではなく、別のプルリクエストを開いてそれを修正するように指示してください。\
+          なお、当該プルリクエストで行が追加/削除されたことによりスコープ外の問題が起こりうる場合は、例外的にこのプルリクエストで修正させてください。
+        
+        【注力してほしい観点】
+        - ビジネスロジックの不備、セキュリティ、パフォーマンス、設計パターンの適切性などに焦点を当ててレビューしてください。
+        - プルリクエストのタイトルや説明文に照らしてスコープ外の変更が含まれていないかをレビューしてください。なお、明らかにスコープ外であると確信できるもの（例: 全く関係ないファイルを編集している等）のみを対象とし、スコープ外かどうかの判断に困る場合は指摘しないでください。\
+          スコープ外の変更が含まれていた場合は指摘し、その部分について、このプルリクエストに含めずに別のプルリクエストを開いて変更するように指示してください。
+  path_filters:
+    - "!CHANGELOG.md"
+    - "!**/__snapshots__/**"

.config/docker_example.yml

@@ -233,15 +233,37 @@ proxyBypassHosts:
 # For security reasons, uploading attachments from the intranet is prohibited,
 # but exceptions can be made from the following settings. Default value is "undefined".
 # Read changelog to learn more (Improvements of 12.90.0 (2021/09/04)).
-#allowedPrivateNetworks: [
-#  '127.0.0.1/32'
-#]
+#allowedPrivateNetworks:
+#  - '127.0.0.1/32'
 
 # Upload or download file size limits (bytes)
 #maxFileSize: 262144000
 
 # Log settings
 # logging:
+#   # Log output format. "json" outputs one-line JSON; defaults to "pretty".
+#   format: pretty
+#   # Minimum level for all loggers. Defaults to info in production and debug otherwise.
+#   level: info
+#   # The longest matching logger domain takes precedence over the global level.
+#   domains:
+#     core.boot: info
+#     queue: error
+#     queue.deliver: debug
+#     db.sql: off
+#   # HTTP status classes to record in the access log. No output when unspecified.
+#   access:
+#     statusClasses:
+#       - '2xx'
+#       - '3xx'
+#       - '4xx'
+#       - '5xx'
+#     # Enable body logging explicitly only during development.
+#     bodies:
+#       request: false
+#       response: false
+#       # 16 KiB by default, up to 128 KiB.
+#       maxBytes: 16384
 #   sql:
 #     # Outputs query parameters during SQL execution to the log.
 #     # default: false

.config/example.yml

@@ -329,6 +329,63 @@ id: 'aidx'
 #    #tracePropagationTargets:
 #    #  - 'internal-service.example'
 
+#   ┌─────────┐
+#───┘ Tracing └────────────────────────────────────────────────
+# OpenTelemetry distributed tracing (Traces only, opt-in).
+# Existing API and Queue spans are exported to an OTLP http/protobuf endpoint.
+#
+# Standard OTEL_* environment variables are honored for values omitted below:
+# OTEL_EXPORTER_OTLP_TRACES_ENDPOINT, OTEL_EXPORTER_OTLP_ENDPOINT,
+# OTEL_EXPORTER_OTLP_HEADERS, OTEL_TRACES_SAMPLER, OTEL_TRACES_SAMPLER_ARG, etc.
+#
+# When this is enabled together with sentryForBackend, Misskey shares Sentry's
+# TracerProvider and adds an OTLP SpanProcessor to it. In that mode:
+# - sampleRate below is ignored; sampling follows sentryForBackend.options
+#   tracesSampleRate / tracesSampler.
+# - resourceAttributes below is ignored; set OTEL_SERVICE_NAME and
+#   OTEL_RESOURCE_ATTRIBUTES in the environment if you need to override them.
+# - spans produced by Sentry integrations are exported to both Sentry and OTLP.
+# - sentry-trace / baggage propagation to outbound remote requests is disabled
+#   by default while OTel is enabled. Set propagateTraceToRemote: true only if
+#   you intentionally want Sentry trace propagation for your deployment.
+
+#otelForBackend:
+#  endpoint: 'http://localhost:4318/v1/traces'
+#  #headers:
+#  #  authorization: 'Bearer xxxxx'
+#  #sampleRate: 1.0
+#  # Record PostgreSQL query spans. Disabled by default to avoid instrumentation
+#  # overhead when database-level diagnostics are not needed.
+#  #capturePgSpans: false
+#  # Include raw SQL text in PostgreSQL spans. Requires capturePgSpans and is
+#  # disabled by default because non-parameterized queries can expose values to
+#  # the OTLP Collector.
+#  #capturePgStatement: false
+#  # Include PostgreSQL connection-pool spans with an existing parent span.
+#  # Requires capturePgSpans and is disabled by default to avoid noisy spans
+#  # from connection churn.
+#  #capturePgConnectionSpans: false
+#  # Record Redis command spans. Disabled by default because subscribing to the
+#  # ioredis diagnostics channel adds work to every Redis command, including
+#  # commands without a parent span. Enable for development diagnostics or when
+#  # the added overhead is acceptable in production.
+#  #captureRedisCommandSpans: false
+#  # Include Redis startup/reconnect spans. Disabled by default to avoid noisy
+#  # connection churn; these spans are recorded even without an HTTP or job
+#  # parent span.
+#  #captureRedisConnectionSpans: false
+#  # Record Redis commands without an HTTP or job parent span. Disabled by
+#  # default because queue polling and background work can produce many root
+#  # traces; only applies when captureRedisCommandSpans is enabled.
+#  #captureRedisRootSpans: false
+#  #resourceAttributes:
+#  #  deployment.environment: 'production'
+#  #propagateTraceToRemote: false
+#  # Queue worker spans are independent traces linked to their enqueuer by default.
+#  # Set to 'parent' to make them child spans instead. This can create very large
+#  # traces for high-fan-out queues such as federation delivery.
+#  #jobTraceContextMode: 'link'
+
 #sentryForFrontend:
 #  vueIntegration:
 #    tracingOptions:
@@ -406,9 +463,8 @@ proxyBypassHosts:
 # For security reasons, uploading attachments from the intranet is prohibited,
 # but exceptions can be made from the following settings. Default value is "undefined".
 # Read changelog to learn more (Improvements of 12.90.0 (2021/09/04)).
-#allowedPrivateNetworks: [
-#  '127.0.0.1/32'
-#]
+#allowedPrivateNetworks:
+#  - '127.0.0.1/32'
 
 # Upload or download file size limits (bytes)
 #maxFileSize: 262144000
@@ -418,6 +474,29 @@ proxyBypassHosts:
 
 # Log settings
 # logging:
+#   # Log output format. "json" outputs one-line JSON; defaults to "pretty".
+#   format: pretty
+#   # Minimum level for all loggers. Defaults to info in production and debug otherwise.
+#   level: info
+#   # The longest matching logger domain takes precedence over the global level.
+#   domains:
+#     core.boot: info
+#     queue: error
+#     queue.deliver: debug
+#     db.sql: off
+#   # HTTP status classes to record in the access log. No output when unspecified.
+#   access:
+#     statusClasses:
+#       - '2xx'
+#       - '3xx'
+#       - '4xx'
+#       - '5xx'
+#     # Enable body logging explicitly only during development.
+#     bodies:
+#       request: false
+#       response: false
+#       # 16 KiB by default, up to 128 KiB.
+#       maxBytes: 16384
 #   sql:
 #     # Outputs query parameters during SQL execution to the log.
 #     # default: false

.config/playwright-devcontainer.yml

@@ -218,9 +218,8 @@ proxyBypassHosts:
 # Media Proxy
 #mediaProxy: https://example.com/proxy
 
-allowedPrivateNetworks: [
-  '127.0.0.1/32'
-]
+allowedPrivateNetworks:
+ - '127.0.0.1/32'
 
 # Upload or download file size limits (bytes)
 #maxFileSize: 262144000

.devcontainer/devcontainer.yml

@@ -205,9 +205,8 @@ proxyBypassHosts:
 # Media Proxy
 #mediaProxy: https://example.com/proxy
 
-allowedPrivateNetworks: [
-  '127.0.0.1/32'
-]
+allowedPrivateNetworks:
+ - '127.0.0.1/32'
 
 # Upload or download file size limits (bytes)
 #maxFileSize: 262144000

.github/scripts/backend-js-footprint-loader.mjs

@@ -1,46 +0,0 @@
-/*
- * SPDX-FileCopyrightText: syuilo and misskey-project
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-import { appendFileSync, statSync } from 'node:fs';
-import { extname } from 'node:path';
-import { fileURLToPath } from 'node:url';
-
-const traceFile = process.env.MK_BACKEND_JS_FOOTPRINT_TRACE;
-const jsExtensions = new Set(['.js', '.mjs', '.cjs']);
-
-function recordLoadedFile(kind, url, format) {
-	if (traceFile == null || !url.startsWith('file:')) return;
-
-	let filePath;
-	try {
-		filePath = fileURLToPath(url);
-	} catch {
-		return;
-	}
-
-	const extension = extname(filePath);
-	if (!jsExtensions.has(extension)) return;
-
-	let size = null;
-	try {
-		size = statSync(filePath).size;
-	} catch {
-		return;
-	}
-
-	appendFileSync(traceFile, `${JSON.stringify({
-		kind,
-		format,
-		path: filePath,
-		size,
-		timestamp: Date.now(),
-	})}\n`);
-}
-
-export async function load(url, context, nextLoad) {
-	const result = await nextLoad(url, context);
-	recordLoadedFile('esm', url, result.format ?? context.format ?? null);
-	return result;
-}

.github/scripts/backend-js-footprint-require.cjs

@@ -1,46 +0,0 @@
-/*
- * SPDX-FileCopyrightText: syuilo and misskey-project
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-'use strict';
-
-const { appendFileSync, statSync } = require('node:fs');
-const Module = require('node:module');
-const { extname } = require('node:path');
-
-const traceFile = process.env.MK_BACKEND_JS_FOOTPRINT_TRACE;
-const jsExtensions = new Set(['.js', '.mjs', '.cjs']);
-
-function recordLoadedFile(kind, filePath, request) {
-	if (traceFile == null || typeof filePath !== 'string') return;
-
-	const extension = extname(filePath);
-	if (!jsExtensions.has(extension) && extension !== '.node') return;
-
-	let size = null;
-	try {
-		size = statSync(filePath).size;
-	} catch {
-		return;
-	}
-
-	appendFileSync(traceFile, `${JSON.stringify({
-		kind,
-		format: extension === '.node' ? 'native' : 'commonjs',
-		path: filePath,
-		request,
-		size,
-		timestamp: Date.now(),
-	})}\n`);
-}
-
-const originalLoad = Module._load;
-const originalResolveFilename = Module._resolveFilename;
-
-Module._load = function load(request, parent, isMain) {
-	const resolved = originalResolveFilename.call(this, request, parent, isMain);
-	const result = originalLoad.apply(this, arguments);
-	recordLoadedFile('cjs', resolved, request);
-	return result;
-};

.github/scripts/backend-js-footprint.mjs

@@ -1,473 +0,0 @@
-/*
- * SPDX-FileCopyrightText: syuilo and misskey-project
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-import { fork, spawn } from 'node:child_process';
-import { createRequire } from 'node:module';
-import { cpus, tmpdir } from 'node:os';
-import { dirname, extname, join, relative, resolve, sep } from 'node:path';
-import { setTimeout } from 'node:timers/promises';
-import { fileURLToPath, pathToFileURL } from 'node:url';
-import { gzipSync } from 'node:zlib';
-import * as fs from 'node:fs/promises';
-import * as fsSync from 'node:fs';
-import * as http from 'node:http';
-import * as util from './utility.mts';
-
-const __filename = fileURLToPath(import.meta.url);
-const __dirname = dirname(__filename);
-
-const [repoDirArg, outputFileArg] = process.argv.slice(2);
-
-const STARTUP_TIMEOUT = util.readIntegerEnv('MK_JS_FOOTPRINT_STARTUP_TIMEOUT_MS', 120000, 1);
-const SETTLE_TIME = util.readIntegerEnv('MK_JS_FOOTPRINT_SETTLE_TIME_MS', 10000, 0);
-const REQUEST_COUNT = util.readIntegerEnv('MK_JS_FOOTPRINT_REQUEST_COUNT', 10, 0);
-
-const repoDir = resolve(repoDirArg);
-const outputFile = resolve(outputFileArg);
-const backendDir = join(repoDir, 'packages/backend');
-const backendBuiltDir = join(backendDir, 'built');
-const traceFile = join(tmpdir(), `misskey-backend-js-footprint-${process.pid}-${Date.now()}.jsonl`);
-const require = createRequire(join(repoDir, 'package.json'));
-const ts = require('typescript');
-const jsExtensions = new Set(['.js', '.mjs', '.cjs']);
-const fileMetricCache = new Map();
-const packageInfoCache = new Map();
-const nativePackageNames = new Set();
-
-function isInside(parent, child) {
-	const rel = relative(parent, child);
-	return rel === '' || (!rel.startsWith('..') && !rel.includes(`..${sep}`));
-}
-
-function bytesToKiB(value) {
-	return Math.round(value / 1024);
-}
-
-async function resetState() {
-	const backendRequire = createRequire(join(backendDir, 'package.json'));
-	const pg = backendRequire('pg');
-	const Redis = backendRequire('ioredis');
-
-	const postgres = new pg.Client({
-		host: '127.0.0.1',
-		port: 54312,
-		database: 'postgres',
-		user: 'postgres',
-	});
-
-	await postgres.connect();
-	try {
-		await postgres.query('DROP DATABASE IF EXISTS "test-misskey" WITH (FORCE)');
-		await postgres.query('CREATE DATABASE "test-misskey"');
-	} finally {
-		await postgres.end();
-	}
-
-	const redis = new Redis({ host: '127.0.0.1', port: 56312 });
-	try {
-		await redis.flushall();
-	} finally {
-		redis.disconnect();
-	}
-}
-
-function createRequest() {
-	return new Promise((resolvePromise, reject) => {
-		const req = http.request({
-			host: 'localhost',
-			port: 61812,
-			path: '/api/meta',
-			method: 'POST',
-		}, res => {
-			res.on('data', () => { });
-			res.on('end', () => resolvePromise());
-		});
-		req.on('error', reject);
-		req.end();
-	});
-}
-
-async function waitForServerReady(serverProcess) {
-	let serverReady = false;
-	serverProcess.on('message', message => {
-		if (message === 'ok') serverReady = true;
-	});
-
-	const startupStartTime = Date.now();
-	while (!serverReady) {
-		if (Date.now() - startupStartTime > STARTUP_TIMEOUT) {
-			serverProcess.kill('SIGTERM');
-			throw new Error('Server startup timeout');
-		}
-		await setTimeout(100);
-	}
-}
-
-async function stopServer(serverProcess) {
-	serverProcess.kill('SIGTERM');
-
-	let exited = false;
-	await new Promise(resolvePromise => {
-		serverProcess.on('exit', () => {
-			exited = true;
-			resolvePromise(undefined);
-		});
-
-		setTimeout(10000).then(() => {
-			if (!exited) serverProcess.kill('SIGKILL');
-			resolvePromise(undefined);
-		});
-	});
-}
-
-function getPackageNameFromPath(filePath) {
-	const normalized = util.normalizePath(filePath);
-	const marker = '/node_modules/';
-	const index = normalized.lastIndexOf(marker);
-	if (index === -1) return null;
-
-	const rest = normalized.slice(index + marker.length).split('/');
-	if (rest[0] === '.pnpm') {
-		const nestedNodeModulesIndex = rest.indexOf('node_modules');
-		if (nestedNodeModulesIndex === -1) return null;
-		const packageParts = rest.slice(nestedNodeModulesIndex + 1);
-		if (packageParts.length === 0) return null;
-		return packageParts[0].startsWith('@') ? packageParts.slice(0, 2).join('/') : packageParts[0];
-	}
-
-	return rest[0]?.startsWith('@') ? rest.slice(0, 2).join('/') : rest[0] ?? null;
-}
-
-function findPackageDir(filePath, packageName) {
-	const normalizedPackageName = packageName.split('/').join(sep);
-	let current = dirname(filePath);
-
-	while (current !== dirname(current)) {
-		if (current.endsWith(`${sep}${normalizedPackageName}`) && fsSync.existsSync(join(current, 'package.json'))) {
-			return current;
-		}
-
-		const parent = dirname(current);
-		if (parent === current) break;
-		current = parent;
-	}
-
-	return null;
-}
-
-function readPackageInfo(filePath) {
-	const externalPackageName = getPackageNameFromPath(filePath);
-	if (externalPackageName != null) {
-		const packageDir = findPackageDir(filePath, externalPackageName);
-		const cacheKey = packageDir ?? externalPackageName;
-		if (packageInfoCache.has(cacheKey)) return packageInfoCache.get(cacheKey);
-
-		let version = null;
-		if (packageDir != null) {
-			try {
-				const packageJson = JSON.parse(fsSync.readFileSync(join(packageDir, 'package.json'), 'utf8'));
-				version = typeof packageJson.version === 'string' ? packageJson.version : null;
-			} catch { }
-		}
-
-		const info = {
-			category: 'external',
-			name: externalPackageName,
-			version,
-			dir: packageDir,
-		};
-		packageInfoCache.set(cacheKey, info);
-		return info;
-	}
-
-	if (isInside(backendBuiltDir, filePath)) {
-		return {
-			category: 'internal',
-			name: 'backend',
-			version: null,
-			dir: backendDir,
-		};
-	}
-
-	return {
-		category: 'internal',
-		name: 'workspace',
-		version: null,
-		dir: repoDir,
-	};
-}
-
-function analyzeSource(filePath, source) {
-	const sourceFile = ts.createSourceFile(filePath, source, ts.ScriptTarget.Latest, true, ts.ScriptKind.JS);
-	const metrics = {
-		astNodeCount: 0,
-		functionCount: 0,
-		classCount: 0,
-		stringLiteralBytes: 0,
-	};
-
-	function visit(node) {
-		metrics.astNodeCount += 1;
-
-		if (
-			ts.isFunctionDeclaration(node) ||
-			ts.isFunctionExpression(node) ||
-			ts.isArrowFunction(node) ||
-			ts.isMethodDeclaration(node) ||
-			ts.isConstructorDeclaration(node) ||
-			ts.isGetAccessorDeclaration(node) ||
-			ts.isSetAccessorDeclaration(node)
-		) {
-			metrics.functionCount += 1;
-		} else if (ts.isClassDeclaration(node) || ts.isClassExpression(node)) {
-			metrics.classCount += 1;
-		} else if (ts.isStringLiteral(node) || ts.isNoSubstitutionTemplateLiteral(node)) {
-			metrics.stringLiteralBytes += Buffer.byteLength(node.text);
-		}
-
-		ts.forEachChild(node, visit);
-	}
-
-	visit(sourceFile);
-	return metrics;
-}
-
-function readFileMetrics(filePath) {
-	if (fileMetricCache.has(filePath)) return fileMetricCache.get(filePath);
-
-	const source = fsSync.readFileSync(filePath);
-	const sourceText = source.toString('utf8');
-	const astMetrics = analyzeSource(filePath, sourceText);
-	const packageInfo = readPackageInfo(filePath);
-	const metric = {
-		path: filePath,
-		displayPath: util.normalizePath(relative(repoDir, filePath)),
-		sourceBytes: source.byteLength,
-		gzipBytes: gzipSync(source).byteLength,
-		...astMetrics,
-		package: packageInfo,
-	};
-
-	fileMetricCache.set(filePath, metric);
-	return metric;
-}
-
-async function readTraceRecords() {
-	let content = '';
-	try {
-		content = await fs.readFile(traceFile, 'utf8');
-	} catch (err) {
-		if (err.code === 'ENOENT') return [];
-		throw err;
-	}
-
-	const records = [];
-	for (const line of content.split('\n')) {
-		if (line.trim() === '') continue;
-		try {
-			records.push(JSON.parse(line));
-		} catch { }
-	}
-	return records;
-}
-
-function emptyTotals() {
-	return {
-		loadedJsModules: 0,
-		loadedJsSourceBytes: 0,
-		loadedJsGzipBytes: 0,
-		astNodeCount: 0,
-		functionCount: 0,
-		classCount: 0,
-		stringLiteralBytes: 0,
-		externalPackageCount: 0,
-		nativeAddonPackageCount: 0,
-	};
-}
-
-function addFileMetrics(target, metric) {
-	target.loadedJsModules += 1;
-	target.loadedJsSourceBytes += metric.sourceBytes;
-	target.loadedJsGzipBytes += metric.gzipBytes;
-	target.astNodeCount += metric.astNodeCount;
-	target.functionCount += metric.functionCount;
-	target.classCount += metric.classCount;
-	target.stringLiteralBytes += metric.stringLiteralBytes;
-}
-
-function summarizeRecords(records, phase) {
-	const jsPaths = new Set();
-	const nativePaths = new Set();
-
-	for (const record of records) {
-		if (typeof record.path !== 'string') continue;
-
-		const extension = extname(record.path);
-		if (jsExtensions.has(extension)) {
-			jsPaths.add(resolve(record.path));
-		} else if (extension === '.node') {
-			nativePaths.add(resolve(record.path));
-		}
-	}
-
-	for (const nativePath of nativePaths) {
-		const packageInfo = readPackageInfo(nativePath);
-		if (packageInfo.category === 'external') nativePackageNames.add(packageInfo.name);
-	}
-
-	const totals = emptyTotals();
-	const packages = new Map();
-	const modules = [];
-
-	for (const filePath of [...jsPaths].toSorted()) {
-		let metric;
-		try {
-			metric = readFileMetrics(filePath);
-		} catch (err) {
-			process.stderr.write(`Failed to analyze ${filePath}: ${err.message}\n`);
-			continue;
-		}
-
-		addFileMetrics(totals, metric);
-
-		const packageKey = metric.package.name;
-		if (!packages.has(packageKey)) {
-			packages.set(packageKey, {
-				name: metric.package.name,
-				version: metric.package.version,
-				category: metric.package.category,
-				sourceBytes: 0,
-				gzipBytes: 0,
-				modules: 0,
-				astNodeCount: 0,
-				functionCount: 0,
-				classCount: 0,
-				stringLiteralBytes: 0,
-				nativeAddon: false,
-			});
-		}
-
-		const packageSummary = packages.get(packageKey);
-		packageSummary.sourceBytes += metric.sourceBytes;
-		packageSummary.gzipBytes += metric.gzipBytes;
-		packageSummary.modules += 1;
-		packageSummary.astNodeCount += metric.astNodeCount;
-		packageSummary.functionCount += metric.functionCount;
-		packageSummary.classCount += metric.classCount;
-		packageSummary.stringLiteralBytes += metric.stringLiteralBytes;
-
-		modules.push({
-			path: metric.displayPath,
-			package: metric.package.name,
-			category: metric.package.category,
-			sourceBytes: metric.sourceBytes,
-			gzipBytes: metric.gzipBytes,
-			astNodeCount: metric.astNodeCount,
-			functionCount: metric.functionCount,
-			classCount: metric.classCount,
-			stringLiteralBytes: metric.stringLiteralBytes,
-		});
-	}
-
-	for (const packageName of nativePackageNames) {
-		const packageSummary = packages.get(packageName);
-		if (packageSummary != null) packageSummary.nativeAddon = true;
-	}
-
-	const externalPackages = [...packages.values()].filter(packageSummary => packageSummary.category === 'external');
-	totals.externalPackageCount = externalPackages.length;
-	totals.nativeAddonPackageCount = externalPackages.filter(packageSummary => packageSummary.nativeAddon).length;
-
-	return {
-		totals: {
-			...totals,
-			loadedJsSourceKiB: bytesToKiB(totals.loadedJsSourceBytes),
-			loadedJsGzipKiB: bytesToKiB(totals.loadedJsGzipBytes),
-			stringLiteralKiB: bytesToKiB(totals.stringLiteralBytes),
-		},
-		packages: [...packages.values()].toSorted((a, b) => b.sourceBytes - a.sourceBytes),
-		modules: modules.toSorted((a, b) => b.sourceBytes - a.sourceBytes),
-	};
-}
-
-async function measureFootprint() {
-	await fs.writeFile(traceFile, '');
-
-	process.stderr.write('Resetting database and Redis\n');
-	await resetState();
-
-	process.stderr.write('Running migrations\n');
-	await util.run('pnpm', ['--filter', 'backend', 'migrate'], {
-		cwd: repoDir,
-		env: process.env,
-		logStdout: true,
-	});
-
-	const serverProcess = fork(join(backendBuiltDir, 'entry.js'), [], {
-		cwd: backendDir,
-		env: {
-			...process.env,
-			NODE_ENV: 'production',
-			MK_DISABLE_CLUSTERING: '1',
-			MK_ONLY_SERVER: '1',
-			MK_NO_DAEMONS: '1',
-			MK_BACKEND_JS_FOOTPRINT_TRACE: traceFile,
-		},
-		stdio: ['pipe', 'pipe', 'pipe', 'ipc'],
-		execArgv: [
-			'--require',
-			join(__dirname, 'backend-js-footprint-require.cjs'),
-			'--experimental-loader',
-			pathToFileURL(join(__dirname, 'backend-js-footprint-loader.mjs')).href,
-		],
-	});
-
-	serverProcess.stdout?.on('data', data => {
-		process.stderr.write(`[server stdout] ${data}`);
-	});
-
-	serverProcess.stderr?.on('data', data => {
-		process.stderr.write(`[server stderr] ${data}`);
-	});
-
-	serverProcess.on('error', err => {
-		process.stderr.write(`[server error] ${err}\n`);
-	});
-
-	try {
-		await waitForServerReady(serverProcess);
-		await setTimeout(SETTLE_TIME);
-
-		//const startup = summarizeRecords(await readTraceRecords(), 'startup');
-
-		await Promise.all(
-			Array.from({ length: REQUEST_COUNT }).map(() => createRequest()),
-		);
-		await setTimeout(1000);
-
-		const afterRequest = summarizeRecords(await readTraceRecords(), 'afterRequest');
-
-		return {
-			timestamp: new Date().toISOString(),
-			measurement: {
-				strategy: 'runtime-loader-trace',
-				startupTimeoutMs: STARTUP_TIMEOUT,
-				settleTimeMs: SETTLE_TIME,
-				requestCount: REQUEST_COUNT,
-				cpus: cpus().length,
-			},
-			phases: {
-				//startup,
-				afterRequest,
-			},
-		};
-	} finally {
-		await stopServer(serverProcess);
-		await fs.rm(traceFile, { force: true });
-	}
-}
-
-const result = await measureFootprint();
-await fs.writeFile(outputFile, `${JSON.stringify(result, null, 2)}\n`);

.github/scripts/backend-memory-report.mts

@@ -1,429 +0,0 @@
-/*
- * SPDX-FileCopyrightText: syuilo and misskey-project
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-import { readFile, writeFile } from 'node:fs/promises';
-import * as util from './utility.mts';
-import * as heapSnapshotUtil from './heap-snapshot-util.mts';
-import type { MemoryReport } from './measure-backend-memory-comparison.mts';
-
-const [baseFile, headFile, outputFile, baseJsFootprintFile, headJsFootprintFile] = process.argv.slice(2);
-
-type RuntimeLoadedJsFootprintReport = {
-	phases: Record<'afterRequest', {
-		totals: {
-			loadedJsModules: number;
-			loadedJsSourceBytes: number;
-			loadedJsGzipBytes: number;
-			astNodeCount: number;
-			functionCount: number;
-			classCount: number;
-			stringLiteralBytes: number;
-			externalPackageCount: number;
-			nativeAddonPackageCount: number;
-		};
-		modules: {
-			path: string;
-			package: string;
-			category: string;
-			sourceBytes: number;
-			gzipBytes: number;
-			astNodeCount: number;
-			functionCount: number;
-			classCount: number;
-			stringLiteralBytes: number;
-		}[];
-	}>;
-};
-
-const memoryReportPhases = [
-	{
-		key: 'afterGc',
-		title: 'After GC',
-	},
-] as const;
-
-const metrics = [
-	'HeapUsed',
-	'Pss',
-	'Private_Dirty',
-	'VmRSS',
-	'External',
-] as const;
-
-function formatMemoryMb(valueKiB: number | null | undefined) {
-	if (valueKiB == null) return '-';
-	return `${util.formatNumber(valueKiB / 1000)} MB`;
-}
-
-function getMemoryValue(report: MemoryReport, phase: typeof memoryReportPhases[number]['key'], metric: typeof metrics[number]) {
-	return report.summary[phase].memoryUsage[metric];
-}
-
-function getMemoryValueFromSample(sample: MemoryReport['samples'][number], phase: typeof memoryReportPhases[number]['key'], metric: typeof metrics[number]) {
-	return sample.phases[phase].memoryUsage[metric];
-}
-
-function getSampleSpread(report: MemoryReport, phase: typeof memoryReportPhases[number]['key'], metric: typeof metrics[number]) {
-	const values = report.samples.map(sample => getMemoryValueFromSample(sample, phase, metric));
-	if (values.length < 2) return null;
-
-	const center = util.median(values);
-	return util.median(values.map(value => Math.abs(value - center)));
-}
-
-function renderMainTableForPhase(base: MemoryReport, head: MemoryReport, phase: typeof memoryReportPhases[number]['key']) {
-	const lines = [
-		'| Metric | Base | Head | Δ median | Δ MAD | Δ min | Δ max |',
-		'| --- | ---: | ---: | ---: | ---: | ---: | ---: |',
-	];
-
-	function formatDeltaMemory(deltaKiB: number) {
-		return util.formatColoredDelta(deltaKiB, v => formatMemoryMb(v), 100); // 0.1 MB threshold
-	}
-
-	for (const metric of metrics) {
-		const baseValue = getMemoryValue(base, phase, metric);
-		const headValue = getMemoryValue(head, phase, metric);
-
-		const baseSpread = getSampleSpread(base, phase, metric);
-		const headSpread = getSampleSpread(head, phase, metric);
-		const summary = util.pairedDeltaSummary(base.samples, head.samples, (sample) => getMemoryValueFromSample(sample, phase, metric));
-		const percent = summary.median * 100 / baseValue;
-		const deltaMedian = summary == null ? '-' : `${formatDeltaMemory(summary.median)}<br>${util.formatDeltaPercent(percent, 0.1).replaceAll('\\%', '\\\\%')}`;
-
-		lines.push(`| **${metric}** | ${formatMemoryMb(baseValue)} <br> ± ${formatMemoryMb(baseSpread)} | ${formatMemoryMb(headValue)} <br> ± ${formatMemoryMb(headSpread)} | ${deltaMedian} | ${summary?.mad == null ? '-' : formatMemoryMb(summary.mad)} | ${summary == null ? '-' : formatDeltaMemory(summary.min)} | ${summary == null ? '-' : formatDeltaMemory(summary.max)} |`);
-	}
-
-	return lines.join('\n');
-}
-
-/*
-function measurementSummary(base, head) {
-	const baseCount = base?.sampleCount;
-	const headCount = head?.sampleCount;
-	const strategy = base?.comparison?.strategy;
-	if (baseCount == null || headCount == null) return null;
-
-	if (strategy === 'interleaved-pairs') {
-		const rounds = base?.comparison?.rounds ?? baseCount;
-		const warmupRounds = base?.comparison?.warmupRounds ?? 0;
-		return `_Measured as ${rounds} interleaved base/head pairs after ${warmupRounds} warmup pair(s). Values are medians; ± is median absolute deviation._`;
-	}
-
-	return `_Sample count: base ${baseCount}, head ${headCount}. Values are medians; ± is median absolute deviation._`;
-}
-*/
-
-function renderHeapSnapshotSection(base: MemoryReport, head: MemoryReport) {
-	const baseHeapSnapshotReport = {
-		summary: base.summary.afterGc.heapSnapshot!,
-		samples: base.samples.map(sample => ({
-			round: sample.round,
-			data: sample.phases.afterGc.heapSnapshot!,
-		})),
-	};
-
-	const headHeapSnapshotReport = {
-		summary: head.summary.afterGc.heapSnapshot!,
-		samples: head.samples.map(sample => ({
-			round: sample.round,
-			data: sample.phases.afterGc.heapSnapshot!,
-		})),
-	};
-
-	const table = heapSnapshotUtil.renderHeapSnapshotTable(baseHeapSnapshotReport, headHeapSnapshotReport);
-	if (table == null) return null;
-
-	const lines = [
-		'### V8 Heap Snapshot Statistics',
-		'',
-		table,
-		'',
-	];
-
-	for (const graph of [
-		//heapSnapshotUtil.renderHeapSnapshotSankey(baseHeapSnapshotReport, 'Base'),
-		heapSnapshotUtil.renderHeapSnapshotSankey(headHeapSnapshotReport, 'Head'),
-	]) {
-		if (graph == null) continue;
-		lines.push(graph);
-		lines.push('');
-	}
-
-	return lines.join('\n');
-}
-
-function getJsFootprintValue(report: RuntimeLoadedJsFootprintReport, phase: 'afterRequest', key: keyof RuntimeLoadedJsFootprintReport['phases'][typeof phase]['totals']) {
-	const value = report.phases[phase].totals[key];
-	return Number.isFinite(value) ? value : null;
-}
-
-function renderJsFootprintMetricTable(base: RuntimeLoadedJsFootprintReport, head: RuntimeLoadedJsFootprintReport) {
-	const metricRows = [
-		['Loaded JS modules', 'loadedJsModules', util.formatNumber],
-		['Loaded JS source', 'loadedJsSourceBytes', util.formatBytes],
-		//['Loaded JS gzip estimate', 'loadedJsGzipBytes', util.formatBytes],
-		//['AST nodes', 'astNodeCount', util.formatNumber],
-		//['Functions', 'functionCount', util.formatNumber],
-		//['Classes', 'classCount', util.formatNumber],
-		//['String literals', 'stringLiteralBytes', util.formatBytes],
-		['External packages loaded', 'externalPackageCount', util.formatNumber],
-		['Native addon packages', 'nativeAddonPackageCount', util.formatNumber],
-	] as const;
-
-	const lines = [
-		'| Metric | Base | Head | Δ | Δ (%) |',
-		'| --- | ---: | ---: | ---: | ---: |',
-	];
-
-	for (const [title, key, formatter] of metricRows) {
-		const baseValue = getJsFootprintValue(base, 'afterRequest', key);
-		const headValue = getJsFootprintValue(head, 'afterRequest', key);
-		if (baseValue == null || headValue == null) continue;
-
-		lines.push(`| **${title}** | ${formatter(baseValue)} | ${formatter(headValue)} | ${util.formatColoredDelta(headValue - baseValue, v => formatter(v))} | ${util.calcAndFormatDeltaPercent(baseValue, headValue).replaceAll('\\%', '\\\\%')} |`);
-	}
-
-	return lines.join('\n');
-}
-
-/*
-function renderJsFootprintPhaseTable(base, head) {
-	const lines = [
-		'| Phase | Base modules | Head modules | Δ modules | Base source | Head source | Δ source |',
-		'| --- | ---: | ---: | ---: | ---: | ---: | ---: |',
-	];
-
-	for (const [phase, title] of [['startup', 'Startup'], ['afterRequest', 'After warmup requests']]) {
-		const baseModules = getJsFootprintValue(base, phase, 'loadedJsModules');
-		const headModules = getJsFootprintValue(head, phase, 'loadedJsModules');
-		const baseSource = getJsFootprintValue(base, phase, 'loadedJsSourceBytes');
-		const headSource = getJsFootprintValue(head, phase, 'loadedJsSourceBytes');
-		if (baseModules == null || headModules == null || baseSource == null || headSource == null) continue;
-
-		lines.push(`| ${title} | ${util.formatNumber(baseModules)} | ${util.formatNumber(headModules)} | ${formatPlainDelta(baseModules, headModules)} | ${util.formatBytes(baseSource)} | ${util.formatBytes(headSource)} | ${formatPlainDelta(baseSource, headSource, util.formatBytes)} |`);
-	}
-
-	return lines.join('\n');
-}
-*/
-
-function packageMap(report: RuntimeLoadedJsFootprintReport) {
-	const map = new Map();
-	for (const packageSummary of report.phases.afterRequest.packages) {
-		if (packageSummary?.category !== 'external' || typeof packageSummary.name !== 'string') continue;
-		map.set(packageSummary.name, packageSummary);
-	}
-	return map;
-}
-
-function packageDisplayName(packageSummary: { name: string; version?: string | null }) {
-	if (packageSummary.version == null) return packageSummary.name;
-	return `${packageSummary.name} ${packageSummary.version}`;
-}
-
-function renderNewExternalPackages(base: RuntimeLoadedJsFootprintReport, head: RuntimeLoadedJsFootprintReport) {
-	const basePackages = packageMap(base);
-	const headPackages = packageMap(head);
-	const newPackages = [...headPackages.values()]
-		.filter(packageSummary => !basePackages.has(packageSummary.name))
-		.toSorted((a, b) => b.sourceBytes - a.sourceBytes)
-		.slice(0, 10);
-
-	if (newPackages.length === 0) return null;
-
-	const lines = [
-		'#### Newly Loaded External Packages',
-		'',
-		'| Package | Loaded JS | Modules | Notes |',
-		'| --- | ---: | ---: | --- |',
-	];
-
-	for (const packageSummary of newPackages) {
-		lines.push(`| ${packageDisplayName(packageSummary)} | ${util.formatBytes(packageSummary.sourceBytes)} | ${util.formatNumber(packageSummary.modules)} | ${packageSummary.nativeAddon ? 'native addon' : ''} |`);
-	}
-
-	return lines.join('\n');
-}
-
-function renderLargestPackageIncreases(base: RuntimeLoadedJsFootprintReport, head: RuntimeLoadedJsFootprintReport) {
-	const basePackages = packageMap(base);
-	const headPackages = packageMap(head);
-	const increases = [...headPackages.values()]
-		.map(headPackage => {
-			const basePackage = basePackages.get(headPackage.name);
-			const baseSourceBytes = basePackage?.sourceBytes ?? 0;
-			const baseModules = basePackage?.modules ?? 0;
-			return {
-				...headPackage,
-				baseSourceBytes,
-				baseModules,
-				sourceDiff: headPackage.sourceBytes - baseSourceBytes,
-				moduleDiff: headPackage.modules - baseModules,
-			};
-		})
-		.filter(packageSummary => packageSummary.sourceDiff > 0)
-		.toSorted((a, b) => b.sourceDiff - a.sourceDiff)
-		.slice(0, 10);
-
-	if (increases.length === 0) return null;
-
-	const lines = [
-		'#### Largest Package Increases',
-		'',
-		'| Package | Base | Head | Δ | Modules Δ |',
-		'| --- | ---: | ---: | ---: | ---: |',
-	];
-
-	for (const packageSummary of increases) {
-		lines.push(`| ${packageDisplayName(packageSummary)} | ${util.formatBytes(packageSummary.baseSourceBytes)} | ${util.formatBytes(packageSummary.sourceBytes)} | ${util.formatColoredDelta(packageSummary.sourceBytes - packageSummary.baseSourceBytes, v => util.formatBytes(v))} | ${util.formatColoredDelta(packageSummary.modules - packageSummary.baseModules, v => util.formatNumber(v))} |`);
-	}
-
-	return lines.join('\n');
-}
-
-function renderNewLoadedModules(base: RuntimeLoadedJsFootprintReport, head: RuntimeLoadedJsFootprintReport) {
-	function moduleMap(report: RuntimeLoadedJsFootprintReport) {
-		const map = new Map();
-		for (const moduleSummary of report.phases.afterRequest.modules) {
-			if (typeof moduleSummary.path !== 'string') continue;
-			map.set(moduleSummary.path, moduleSummary);
-		}
-		return map;
-	}
-
-	const baseModules = moduleMap(base);
-	const headModules = moduleMap(head);
-	const newModules = [...headModules.values()]
-		.filter(moduleSummary => !baseModules.has(moduleSummary.path))
-		.toSorted((a, b) => b.sourceBytes - a.sourceBytes)
-		.slice(0, 10);
-
-	if (newModules.length === 0) return null;
-
-	const lines = [
-		'#### Largest Newly Loaded Modules',
-		'',
-		'| Module | Package | Loaded JS |',
-		'| --- | --- | ---: |',
-	];
-
-	for (const moduleSummary of newModules) {
-		lines.push(`| \`${moduleSummary.path}\` | ${moduleSummary.package} | ${util.formatBytes(moduleSummary.sourceBytes)} |`);
-	}
-
-	return lines.join('\n');
-}
-
-function renderJsFootprintSection(base: RuntimeLoadedJsFootprintReport, head: RuntimeLoadedJsFootprintReport) {
-	const lines = [
-		'### Runtime Loaded JS Footprint',
-		'',
-		'<details><summary>Click to show</summary>',
-		'',
-		renderJsFootprintMetricTable(base, head),
-		'',
-		//'#### Load Phase Breakdown',
-		//'',
-		//renderJsFootprintPhaseTable(base, head),
-		//'',
-	];
-
-	for (const block of [
-		renderNewExternalPackages(base, head),
-		renderLargestPackageIncreases(base, head),
-		renderNewLoadedModules(base, head),
-	]) {
-		if (block == null) continue;
-		lines.push(block);
-		lines.push('');
-	}
-
-	lines.push('</details>');
-	lines.push('');
-
-	return lines.join('\n');
-}
-
-const base = JSON.parse(await readFile(baseFile, 'utf8')) as MemoryReport;
-const head = JSON.parse(await readFile(headFile, 'utf8')) as MemoryReport;
-const baseJsFootprint = JSON.parse(await readFile(baseJsFootprintFile, 'utf8')) as RuntimeLoadedJsFootprintReport;
-const headJsFootprint = JSON.parse(await readFile(headJsFootprintFile, 'utf8')) as RuntimeLoadedJsFootprintReport;
-const lines = [
-	'## ⚙️ Backend Memory Usage Report',
-	'',
-];
-
-//const summary = measurementSummary(base, head);
-//if (summary != null) {
-//	lines.push(summary);
-//	lines.push('');
-//}
-
-for (const phase of memoryReportPhases) {
-	lines.push(`### ${phase.title}`);
-	lines.push(renderMainTableForPhase(base, head, phase.key));
-	lines.push('');
-}
-
-const heapSnapshotSection = renderHeapSnapshotSection(base, head);
-if (heapSnapshotSection != null) {
-	lines.push(heapSnapshotSection);
-	lines.push('');
-}
-
-const artifactUrl = process.env.MK_MEMORY_HEAP_SNAPSHOT_ARTIFACT_URL_HEAD!.trim();
-lines.push(`[Download representative V8 heap snapshot (head)](${artifactUrl})`);
-lines.push('');
-
-const jsFootprintSection = renderJsFootprintSection(baseJsFootprint, headJsFootprint);
-if (jsFootprintSection != null) {
-	lines.push(jsFootprintSection);
-	lines.push('');
-}
-
-function getWarningMetric(base: MemoryReport, head: MemoryReport) {
-	for (const metric of ['Pss', 'Private_Dirty', 'VmRSS'] as const) {
-		if (getMemoryValue(base, 'afterGc', metric) != null && getMemoryValue(head, 'afterGc', metric) != null) {
-			return metric;
-		}
-	}
-	return null;
-}
-
-function getDiffPercent(base: MemoryReport, head: MemoryReport, phase: typeof memoryReportPhases[number]['key'], metric: typeof metrics[number]) {
-	const baseValue = getMemoryValue(base, phase, metric);
-	const headValue = getMemoryValue(head, phase, metric);
-	if (baseValue == null || headValue == null || baseValue <= 0) return null;
-
-	return ((headValue - baseValue) * 100) / baseValue;
-}
-
-function isBeyondSampleNoise(base: MemoryReport, head: MemoryReport, phase: typeof memoryReportPhases[number]['key'], metric: typeof metrics[number]) {
-	const baseValue = getMemoryValue(base, phase, metric);
-	const headValue = getMemoryValue(head, phase, metric);
-	if (baseValue == null || headValue == null) return false;
-
-	const delta = headValue - baseValue;
-	if (delta <= 0) return false;
-
-	const baseSpread = getSampleSpread(base, phase, metric);
-	const headSpread = getSampleSpread(head, phase, metric);
-	if (baseSpread == null || headSpread == null) return true;
-
-	const combinedSpread = Math.hypot(baseSpread, headSpread);
-	return delta > combinedSpread * 3;
-}
-
-const warningMetric = getWarningMetric(base, head);
-const warningDiffPercent = warningMetric == null ? null : getDiffPercent(base, head, 'afterGc', warningMetric);
-if (warningMetric != null && warningDiffPercent != null && warningDiffPercent > 5 && isBeyondSampleNoise(base, head, 'afterGc', warningMetric)) {
-	lines.push(`⚠️ **Warning**: Memory usage (${warningMetric}) has increased by more than 5% and exceeds the observed sample noise. Please verify this is not an unintended change.`);
-	lines.push('');
-}
-
-//lines.push(`[See workflow logs for details](https://github.com/${process.env.GITHUB_REPOSITORY}/actions/runs/${process.env.GITHUB_RUN_ID})`);
-
-await writeFile(outputFile, `${lines.join('\n')}\n`);

.github/scripts/frontend-js-size.mts

@@ -1,503 +0,0 @@
-/*
- * SPDX-FileCopyrightText: syuilo and misskey-project
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-import { promises as fs } from 'node:fs';
-import path from 'node:path';
-import * as util from './utility.mts';
-
-const marker = '<!-- misskey-frontend-js-size -->';
-
-const locale = process.env.FRONTEND_JS_SIZE_LOCALE ?? 'ja-JP';
-
-//function sharePercent(value, total) {
-//	if (total === 0) return '0%';
-//	return Math.round((value / total) * 100) + '%';
-//}
-
-function escapeCell(value: string) {
-	return String(value).replaceAll('|', '\\|').replaceAll('\n', '<br>');
-}
-
-//function tableCell(value) {
-//	return String(value).replaceAll('|', '\\|').replaceAll('\r', ' ').replaceAll('\n', ' ');
-//}
-
-//function code(value) {
-//	const sanitized = String(value).replaceAll('\r', ' ').replaceAll('\n', ' ');
-//	const backtickRuns = sanitized.match(/`+/g) ?? [];
-//	const fenceLength = Math.max(1, ...backtickRuns.map((run) => run.length + 1));
-//	const fence = '`'.repeat(fenceLength);
-//	const padding = sanitized.startsWith('`') || sanitized.endsWith('`') ? ' ' : '';
-//
-//	return `${fence}${padding}${sanitized}${padding}${fence}`;
-//}
-
-//function tableCode(value) {
-//	return tableCell(code(value));
-//}
-
-type Manifest = Record<string, { file?: string; src?: string; name?: string; isEntry?: boolean; imports?: string[] }>;
-
-type FileEntry = {
-	key: string;
-	displayName: string;
-	file: string;
-	size: number;
-};
-
-function entryDisplayName(entry: FileEntry) {
-	if (!entry) return '';
-	return entry.displayName || entry.file;
-}
-
-function findEntryKey(manifest: Manifest) {
-	const entries = Object.entries(manifest);
-	return entries.find(([key, chunk]) => key === 'src/_boot_.ts' || chunk.src === 'src/_boot_.ts')?.[0]
-		?? entries.find(([, chunk]) => chunk.name === 'entry' && chunk.isEntry)?.[0]
-		?? entries.find(([, chunk]) => chunk.isEntry)?.[0]
-		?? null;
-}
-
-function stableChunkKey(manifestKey: string, chunk: Manifest[string]) {
-	return chunk.src ?? (chunk.name ? `chunk:${chunk.name}` : manifestKey);
-}
-
-function collectStartupKeys(manifest: Manifest) {
-	const entryKey = findEntryKey(manifest);
-	const keys = new Set<string>();
-	if (entryKey == null) return keys;
-
-	function visit(key: string) {
-		if (keys.has(key)) return;
-		const chunk = manifest[key];
-		if (!chunk || !chunk.file?.endsWith('.js')) return;
-		keys.add(stableChunkKey(key, chunk));
-		for (const importKey of chunk.imports ?? []) {
-			visit(importKey);
-		}
-	}
-
-	visit(entryKey);
-	return keys;
-}
-
-async function resolveBuiltFile(outDir: string, file: string) {
-	if (file.startsWith('scripts/')) {
-		const localizedFile = file.slice('scripts/'.length);
-		const localizedPath = path.join(outDir, locale, localizedFile);
-		if (await util.fileExists(localizedPath)) {
-			return {
-				absolutePath: localizedPath,
-				relativePath: `${locale}/${localizedFile}`,
-			};
-		}
-
-		throw new Error(`Expected ${locale} localized chunk for ${file}, but ${localizedPath} was not found.`);
-	}
-	return {
-		absolutePath: path.join(outDir, file),
-		relativePath: file,
-	};
-}
-
-async function collectReport(repoDir: string) {
-	const outDir = path.join(repoDir, 'built/_frontend_vite_');
-	const manifestPath = path.join(outDir, 'manifest.json');
-	const manifest = JSON.parse(await fs.readFile(manifestPath, 'utf8')) as Manifest;
-	const byKey = new Map<string, FileEntry>();
-	const byFile = new Set<string>();
-
-	for (const [key, chunk] of Object.entries(manifest)) {
-		if (!chunk.file?.endsWith('.js')) continue;
-		const builtFile = await resolveBuiltFile(outDir, chunk.file);
-		const size = await util.fileSize(builtFile.absolutePath);
-		const stableKey = stableChunkKey(key, chunk);
-		const displayName = chunk.src ?? chunk.name ?? key;
-		byKey.set(stableKey, {
-			key: stableKey,
-			displayName,
-			file: builtFile.relativePath,
-			size,
-		});
-		byFile.add(builtFile.relativePath);
-	}
-
-	const localeDir = path.join(outDir, locale);
-	if (await util.fileExists(localeDir)) {
-		for await (const fullPath of util.traverseDirectory(localeDir)) {
-			if (!fullPath.endsWith('.js')) continue;
-			const relativePath = util.normalizePath(path.relative(outDir, fullPath));
-			if (byFile.has(relativePath)) continue;
-			const size = await util.fileSize(fullPath);
-			byKey.set(relativePath, {
-				key: relativePath,
-				displayName: relativePath,
-				file: relativePath,
-				size,
-			});
-		}
-	}
-
-	return {
-		manifest,
-		chunks: Object.fromEntries(byKey),
-		startupKeys: [...collectStartupKeys(manifest)],
-	};
-}
-
-type VisualizerReport = {
-	nodeParts?: Record<string, {
-		renderedLength: number;
-		gzipLength: number;
-		brotliLength: number;
-	}>;
-	nodeMetas?: Record<string, {
-		id: string;
-		isEntry?: boolean;
-		isExternal?: boolean;
-		importedBy?: string[];
-		imported?: { id: string; dynamic?: boolean }[];
-		moduleParts?: Record<string, string>;
-		renderedLength: number;
-		gzipLength: number;
-		brotliLength: number;
-	}>;
-	options?: Record<string, unknown>;
-};
-
-
-function collectVisualizerReport(data: VisualizerReport) {
-	const nodeParts = data.nodeParts ?? {};
-	const nodeMetas = Object.values(data.nodeMetas ?? {});
-	const moduleRows = [];
-	const bundleMap = new Map();
-
-	for (const meta of nodeMetas) {
-		const row = {
-			id: meta.id,
-			bundles: 0,
-			renderedLength: 0,
-			gzipLength: 0,
-			brotliLength: 0,
-			importedByCount: meta.importedBy?.length ?? 0,
-			importedCount: meta.imported?.length ?? 0,
-		};
-
-		for (const [bundleId, partUid] of Object.entries(meta.moduleParts ?? {})) {
-			const part = nodeParts[partUid];
-			if (part == null) continue;
-
-			row.bundles += 1;
-			row.renderedLength += part.renderedLength;
-			row.gzipLength += part.gzipLength;
-			row.brotliLength += part.brotliLength;
-
-			const bundle = bundleMap.get(bundleId) ?? {
-				id: bundleId,
-				modules: 0,
-				renderedLength: 0,
-				gzipLength: 0,
-				brotliLength: 0,
-			};
-			bundle.modules += 1;
-			bundle.renderedLength += part.renderedLength;
-			bundle.gzipLength += part.gzipLength;
-			bundle.brotliLength += part.brotliLength;
-			bundleMap.set(bundleId, bundle);
-		}
-
-		if (row.bundles > 0) {
-			moduleRows.push(row);
-		}
-	}
-
-	let staticImports = 0;
-	let dynamicImports = 0;
-	for (const meta of nodeMetas) {
-		for (const imported of meta.imported ?? []) {
-			if (imported.dynamic) {
-				dynamicImports += 1;
-			} else {
-				staticImports += 1;
-			}
-		}
-	}
-
-	const bundleRows = [...bundleMap.values()].sort((a, b) => b.renderedLength - a.renderedLength);
-	const hotModules = [...moduleRows].sort((a, b) => b.renderedLength - a.renderedLength);
-	const totalRendered = moduleRows.reduce((sum, row) => sum + row.renderedLength, 0);
-	const totalGzip = moduleRows.reduce((sum, row) => sum + row.gzipLength, 0);
-	const totalBrotli = moduleRows.reduce((sum, row) => sum + row.brotliLength, 0);
-
-	return {
-		options: data.options ?? {},
-		summary: {
-			bundles: bundleRows.length,
-			modules: moduleRows.length,
-			entries: nodeMetas.filter((meta) => meta.isEntry).length,
-			externals: nodeMetas.filter((meta) => meta.isExternal).length,
-			staticImports,
-			dynamicImports,
-		},
-		metrics: {
-			renderedLength: totalRendered,
-			gzipLength: totalGzip,
-			brotliLength: totalBrotli,
-		},
-		hotModules,
-	};
-}
-
-function renderVisualizerSummaryTable(before: ReturnType<typeof collectVisualizerReport>, after: ReturnType<typeof collectVisualizerReport>) {
-	const summary = [
-		'bundles',
-		'modules',
-		'entries',
-		//'externals',
-		'staticImports',
-		'dynamicImports',
-	] as const;
-
-	const metrics = [
-		'renderedLength',
-		'gzipLength',
-		'brotliLength',
-	] as const;
-
-	return [
-		`<table>`,
-		`<thead>`,
-		`<tr>`,
-		`<th rowspan="2"></th>`,
-		`<th rowspan="2">Bundles</th>`,
-		`<th rowspan="2">Modules</th>`,
-		`<th rowspan="2">Entries</th>`,
-		`<th colspan="2">Imports</th>`,
-		`<th colspan="3">Size</th>`,
-		`</tr>`,
-		`<tr>`,
-		`<th>Static</th>`,
-		`<th>Dynamic</th>`,
-		`<th>Rendered</th>`,
-		`<th>Gzip</th>`,
-		`<th>Brotli</th>`,
-		`</tr>`,
-		`</thead>`,
-		`<tbody>`,
-		`<tr>`,
-		`<th><b>Before</b></th>`,
-		...summary.map((key) => `<td>${util.formatNumber(before.summary[key])}</td>`),
-		...metrics.map((key) => `<td>${util.formatBytes(before.metrics[key])}</td>`),
-		`</tr>`,
-		`<tr>`,
-		`<th><b>After</b></th>`,
-		...summary.map((key) => `<td>${util.formatNumber(after.summary[key])}</td>`),
-		...metrics.map((key) => `<td>${util.formatBytes(after.metrics[key])}</td>`),
-		`</tr>`,
-		`<tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr>`,
-		`<tr>`,
-		`<th><b>Δ</b></th>`,
-		...summary.map((key) => `<td>${util.calcAndFormatDeltaNumber(before.summary[key], after.summary[key], 0)}</td>`),
-		...metrics.map((key) => `<td>${util.calcAndFormatDeltaBytes(before.metrics[key], after.metrics[key], 1000)}</td>`),
-		`</tr>`,
-		`<tr>`,
-		`<th><b>Δ (%)</b></th>`,
-		...summary.map((key) => `<td>${util.calcAndFormatDeltaPercent(before.summary[key], after.summary[key], 0.1)}</td>`),
-		...metrics.map((key) => `<td>${util.calcAndFormatDeltaPercent(before.metrics[key], after.metrics[key], 0.1)}</td>`),
-		`</tr>`,
-		`</tbody>`,
-		`</table>`,
-	];
-}
-
-function getChunkComparisonRows(keys: string[], before: Awaited<ReturnType<typeof collectReport>>, after: Awaited<ReturnType<typeof collectReport>>) {
-	return keys.map((key) => {
-		const beforeEntry = before.chunks[key];
-		const afterEntry = after.chunks[key];
-		const beforeSize = beforeEntry?.size ?? 0;
-		const afterSize = afterEntry?.size ?? 0;
-		return {
-			key,
-			name: entryDisplayName(beforeEntry ?? afterEntry),
-			chunkFile: beforeEntry?.file ?? afterEntry?.file,
-			beforeSize,
-			afterSize,
-			changeType: beforeEntry == null ? 'added' : afterEntry == null ? 'removed' : beforeSize !== afterSize ? 'updated' : 'unchanged',
-			sortSize: Math.max(beforeSize, afterSize),
-		};
-	});
-}
-
-function summarizeChunkChanges(rows: ReturnType<typeof getChunkComparisonRows>) {
-	return {
-		updated: rows.filter((row) => row.changeType === 'updated').length,
-		added: rows.filter((row) => row.changeType === 'added').length,
-		removed: rows.filter((row) => row.changeType === 'removed').length,
-	};
-}
-
-function formatChunkChangeSummary(label: string, summary: ReturnType<typeof summarizeChunkChanges>) {
-	return `${label} (${summary.updated} updated, ${summary.added} added, ${summary.removed} removed)`;
-}
-
-function compareChunkComparisonRows(a: ReturnType<typeof getChunkComparisonRows>[number], b: ReturnType<typeof getChunkComparisonRows>[number]) {
-	return Math.abs(b.afterSize - b.beforeSize) - Math.abs(a.afterSize - a.beforeSize)
-		|| (b.afterSize - b.beforeSize) - (a.afterSize - a.beforeSize)
-		|| b.sortSize - a.sortSize
-		|| a.name.localeCompare(b.name);
-}
-
-function chunkMarkdownTable(rows: ReturnType<typeof getChunkComparisonRows>, total?: { beforeSize: number; afterSize: number }) {
-	if (rows.length === 0) return '_No data_';
-
-	const lines = [
-		'| Chunk | Before | After | Δ | Δ (%) |',
-		'| --- | ---: | ---: | ---: | ---: |',
-	];
-	if (total != null) {
-		lines.push(`| (total) | ${util.formatBytes(total.beforeSize)} | ${util.formatBytes(total.afterSize)} | ${util.calcAndFormatDeltaBytes(total.beforeSize, total.afterSize, 1000)} | ${util.calcAndFormatDeltaPercent(total.beforeSize, total.afterSize, 0.1).replaceAll('\\%', '\\\\%')} |`);
-		lines.push('| | | | | |');
-	}
-	for (const row of rows) {
-		if (row.changeType === 'added') {
-			lines.push(`| <details><summary>\`${escapeCell(row.name)}\`</summary> \`${escapeCell(row.chunkFile)}\` </details> | ${util.formatBytes(row.beforeSize)} | ${util.formatBytes(row.afterSize)} | ${util.calcAndFormatDeltaBytes(row.beforeSize, row.afterSize, 1000)} | $\\color{orange}{\\text{( + )}}$ |`);
-		} else if (row.changeType === 'removed') {
-			lines.push(`| <details><summary>\`${escapeCell(row.name)}\`</summary> \`${escapeCell(row.chunkFile)}\` </details> | ${util.formatBytes(row.beforeSize)} | ${util.formatBytes(row.afterSize)} | ${util.calcAndFormatDeltaBytes(row.beforeSize, row.afterSize, 1000)} | $\\color{green}{\\text{( - )}}$ |`);
-		} else {
-			lines.push(`| <details><summary>\`${escapeCell(row.name)}\`</summary> \`${escapeCell(row.chunkFile)}\` </details> | ${util.formatBytes(row.beforeSize)} | ${util.formatBytes(row.afterSize)} | ${util.calcAndFormatDeltaBytes(row.beforeSize, row.afterSize, 1000)} | ${util.calcAndFormatDeltaPercent(row.beforeSize, row.afterSize, 0.1).replaceAll('\\%', '\\\\%')} |`);
-		}
-	}
-	return lines.join('\n');
-}
-
-function renderFrontendChunkReport(before: Awaited<ReturnType<typeof collectReport>>, after: Awaited<ReturnType<typeof collectReport>>) {
-	const commonChunkKeys = Object.keys(before.chunks).filter((key) => after.chunks[key] != null);
-	const addedChunkKeys = Object.keys(after.chunks).filter((key) => before.chunks[key] == null);
-	const removedChunkKeys = Object.keys(before.chunks).filter((key) => after.chunks[key] == null);
-	const allChunkKeys = [
-		...commonChunkKeys,
-		...addedChunkKeys,
-		...removedChunkKeys,
-	];
-	//const comparisonRows = getChunkComparisonRows(commonChunkKeys, before, after);
-	const allComparisonRows = getChunkComparisonRows(allChunkKeys, before, after);
-
-	const changedRows = allComparisonRows.filter((row) => row.changeType !== 'unchanged');
-	const diffSummary = summarizeChunkChanges(changedRows);
-	const diffTotal = {
-		beforeSize: allComparisonRows.reduce((sum, row) => sum + row.beforeSize, 0),
-		afterSize: allComparisonRows.reduce((sum, row) => sum + row.afterSize, 0),
-	};
-	const diffRows = changedRows.sort(compareChunkComparisonRows).slice(0, 30); // TODO: 実際に30を超えて切り捨てられたrowがあった場合はその旨をmarkdown内に表示するようにする
-
-	const startupKeys = new Set([
-		...before.startupKeys,
-		...after.startupKeys,
-	]);
-	const startupComparisonRows = getChunkComparisonRows([...startupKeys], before, after);
-	const startupRows = startupComparisonRows.sort(compareChunkComparisonRows);
-	const startupSummary = summarizeChunkChanges(startupComparisonRows);
-	const startupTotal = {
-		beforeSize: startupComparisonRows.reduce((sum, row) => sum + row.beforeSize, 0),
-		afterSize: startupComparisonRows.reduce((sum, row) => sum + row.afterSize, 0),
-	};
-
-	//const largeRows = comparisonRows
-	//	.sort((a, b) => b.sortSize - a.sortSize || a.name.localeCompare(b.name))
-	//	.slice(0, 30);
-
-	return [
-		'<details open>',
-		`<summary>${formatChunkChangeSummary('Chunk size diff', diffSummary)}</summary>`,
-		'',
-		chunkMarkdownTable(diffRows, diffTotal),
-		'',
-		'</details>',
-		'',
-		'<details>',
-		`<summary>${formatChunkChangeSummary('Startup chunk size', startupSummary)}</summary>`,
-		'',
-		chunkMarkdownTable(startupRows, startupTotal),
-		'',
-		`_Startup chunks are the Vite entry for \`src/_boot_.ts\` and its static imports._`,
-		'',
-		'</details>',
-		'',
-		//'<details>',
-		//`<summary>Largest</summary>`,
-		//'',
-		//markdownTable(largeRows),
-		//'',
-		//'</details>',
-		//'',
-	].join('\n');
-}
-
-function renderFrontendBundleReport(before: ReturnType<typeof collectVisualizerReport>, after: ReturnType<typeof collectVisualizerReport>) {
-	const lines = [
-		...renderVisualizerSummaryTable(before, after),
-		'',
-		//'<details>',
-		//'<summary>Top 10</summary>',
-		//'',
-	];
-
-	/*
-	for (const row of after.hotModules.slice(0, 10)) {
-		lines.push(`- ${code(row.id)}: ${sharePercent(row.renderedLength, after.metrics.renderedLength)} (${formatBytes(row.renderedLength)})`);
-	}
-
-	lines.push(
-		'',
-		'</details>',
-	);
-
-	lines.push(
-		'',
-		'<details>',
-		'<summary>Hot Modules (Self Size)</summary>',
-		'',
-		'| Module | Bundles | Rendered | Share | Gzip | Brotli | Imports | Imported By |',
-		'|---|---:|---:|---:|---:|---:|---:|---:|',
-	);
-
-	for (const row of after.hotModules.slice(0, 15)) {
-		lines.push(`| ${tableCode(row.id)} | ${row.bundles} | ${formatBytes(row.renderedLength)} | ${sharePercent(row.renderedLength, after.metrics.renderedLength)} | ${formatBytes(row.gzipLength)} | ${formatBytes(row.brotliLength)} | ${row.importedCount} | ${row.importedByCount} |`);
-	}
-
-	lines.push(
-		'',
-		'</details>',
-	);
-	*/
-
-	return lines.join('\n');
-}
-
-const args = process.argv.slice(2);
-const [beforeDir, afterDir, beforeStatsFile, afterStatsFile, outFile] = args;
-const before = await collectReport(beforeDir);
-const after = await collectReport(afterDir);
-const beforeStats = JSON.parse(await fs.readFile(beforeStatsFile, 'utf8')) as VisualizerReport;
-const afterStats = JSON.parse(await fs.readFile(afterStatsFile, 'utf8')) as VisualizerReport;
-const beforeVisualizerReport = collectVisualizerReport(beforeStats);
-const afterVisualizerReport = collectVisualizerReport(afterStats);
-const visualizerArtifactLink = `[Open treemap HTML](${process.env.FRONTEND_BUNDLE_REPORT_ARTIFACT_URL})`;
-
-const body = [
-	marker,
-	'',
-	`## 📦 Frontend Bundle Report`,
-	'',
-	renderFrontendChunkReport(before, after),
-	'',
-	'## Bundle Stats',
-	'',
-	renderFrontendBundleReport(beforeVisualizerReport, afterVisualizerReport),
-	'',
-	visualizerArtifactLink,
-].join('\n');
-
-await fs.writeFile(outFile, body);

.github/scripts/heap-snapshot-util.mts

@@ -1,200 +0,0 @@
-/*
- * SPDX-FileCopyrightText: syuilo and misskey-project
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-// NOTE: このファイルはworkflow上でバックエンドからも参照されるため、side effectがあってはならない
-
-import * as util from './utility.mts';
-
-export const heapSnapshotCategory = {
-	total: { label: 'Total', color: 'gray', colorHex: '#888888' },
-	code: { label: 'Code', color: 'orange', colorHex: '#f28e2c' },
-	strings: { label: 'Strings', color: 'red', colorHex: '#e15759' },
-	jsArrays: { label: 'JS arrays', color: 'cyan', colorHex: '#76b7b2' },
-	typedArrays: { label: 'Typed arrays', color: 'green', colorHex: '#59a14f' },
-	systemObjects: { label: 'System objects', color: 'yellow', colorHex: '#edc949' },
-	otherJsObjects: { label: 'Other JS objs', color: 'violet', colorHex: '#af7aa1' },
-	otherNonJsObjects: { label: 'Other non-JS objs', color: 'pink', colorHex: '#ff9da7' },
-} as const satisfies Record<string, { label: string; color: string; colorHex: string }>;
-
-export type HeapSnapshotData = {
-	categories: Record<keyof typeof heapSnapshotCategory, number>;
-	nodeCounts: Record<keyof typeof heapSnapshotCategory, number>;
-	breakdowns?: Record<keyof typeof heapSnapshotCategory, Record<string, number>>;
-};
-
-export type HeapSnapshotReport = {
-	summary: HeapSnapshotData;
-	samples: {
-		round: number;
-		data: HeapSnapshotData;
-	}[];
-};
-
-function getHeapSnapshotCategoryValue(report: HeapSnapshotReport, category: keyof typeof heapSnapshotCategory) {
-	return report.summary.categories[category];
-}
-
-export function renderHeapSnapshotTable(base: HeapSnapshotReport, head: HeapSnapshotReport) {
-	const lines = [
-		'| Metric | Base | Head | Δ median | Δ MAD | Δ min | Δ max |',
-		'| --- | ---: | ---: | ---: | ---: | ---: | ---: |',
-	];
-	const baseTotal = getHeapSnapshotCategoryValue(base, 'total');
-	const headTotal = getHeapSnapshotCategoryValue(head, 'total');
-
-	function getHeapSnapshotSampleSpread(report: HeapSnapshotReport, category: keyof typeof heapSnapshotCategory) {
-		const values = report.samples
-			.map(sample => sample.data.categories[category])
-			.filter(value => Number.isFinite(value)) as number[];
-		if (values.length < 2) throw new Error(`Not enough samples for category ${category}`);
-
-		const center = util.median(values);
-		return util.median(values.map(value => Math.abs(value - center)));
-	}
-
-	for (const category of Object.keys(heapSnapshotCategory) as (keyof typeof heapSnapshotCategory)[]) {
-		const baseValue = getHeapSnapshotCategoryValue(base, category);
-		const headValue = getHeapSnapshotCategoryValue(head, category);
-		const baseSpread = getHeapSnapshotSampleSpread(base, category);
-		const headSpread = getHeapSnapshotSampleSpread(head, category);
-		const summary = util.pairedDeltaSummary(base.samples, head.samples, (sample) => sample.data.categories[category]);
-		const percent = summary.median * 100 / baseValue;
-
-		if (category === 'total') {
-			const deltaMedian = `${util.formatDeltaBytes(summary.median, 100000)}<br>${util.formatDeltaPercent(percent, 0.1).replaceAll('\\%', '\\\\%')}`;
-			const baseText = `${util.formatBytes(baseValue)} <br> ± ${util.formatBytes(baseSpread)}`;
-			const headText = `${util.formatBytes(headValue)} <br> ± ${util.formatBytes(headSpread)}`;
-			const metricText = `$\\color{${heapSnapshotCategory[category].color}}{\\rule{8pt}{8pt}}$ **${heapSnapshotCategory[category].label}**`;
-			lines.push(`| ${metricText} | ${baseText} | ${headText} | ${deltaMedian} | ${util.formatBytes(summary.mad)} | ${util.formatDeltaBytes(summary.min, 100000)} | ${util.formatDeltaBytes(summary.max, 100000)} |`);
-			lines.push('| | | | | | | |');
-		} else {
-			const deltaMedian = util.formatDeltaBytes(summary.median, 100000);
-			const baseText = util.formatBytes(baseValue);
-			const headText = util.formatBytes(headValue);
-			const basePercent = util.formatPercent((baseValue * 100) / baseTotal);
-			const headPercent = util.formatPercent((headValue * 100) / headTotal);
-			const metricText = `<details><summary>$\\color{${heapSnapshotCategory[category].color}}{\\rule{8pt}{8pt}}$ **${heapSnapshotCategory[category].label}**</summary>${basePercent} → ${headPercent}</details>`;
-			lines.push(`| ${metricText} | ${baseText} | ${headText} | ${deltaMedian} | ${util.formatBytes(summary.mad)} | ${util.formatDeltaBytes(summary.min, 100000)} | ${util.formatDeltaBytes(summary.max, 100000)} |`);
-		}
-	}
-
-	if (lines.length === 2) return null;
-	return lines.join('\n');
-}
-
-const heapSnapshotSankeyChildMinRatio = 0.3;
-const heapSnapshotSankeyParentMinPercent = 10;
-
-function escapeCsvValue(value: string) {
-	return `"${String(value).replaceAll('"', '""')}"`;
-}
-
-export function renderHeapSnapshotSankey(report: HeapSnapshotReport, title: string) {
-	const total = getHeapSnapshotCategoryValue(report, 'total');
-	if (total == null || total <= 0) return null;
-
-	function getHeapSnapshotBreakdownEntries(category: keyof typeof heapSnapshotCategory) {
-		const breakdown = report.summary.breakdowns?.[category];
-		if (breakdown == null || typeof breakdown !== 'object') return [];
-
-		return Object.entries(breakdown)
-			.filter(([, value]) => Number.isFinite(value) && value > 0)
-			.toSorted((a, b) => b[1] - a[1]);
-	}
-
-	function formatHeapSnapshotSankeyChildLabel(label: string) {
-		return String(label).replace(/^[^:]+:\s*/, '');
-	}
-
-	function formatSankeyPercentValue(value: number) {
-		const rounded = Math.round(value * 100) / 100;
-		if (rounded === 0 && value > 0) return '0.01';
-		if (Number.isInteger(rounded)) return String(rounded);
-		return rounded.toFixed(2).replace(/0+$/, '').replace(/\.$/, '');
-	}
-
-	const categories = (Object.keys(heapSnapshotCategory) as (keyof typeof heapSnapshotCategory)[])
-		.filter(category => category !== 'total')
-		.map(category => {
-			const value = getHeapSnapshotCategoryValue(report, category);
-			if (value == null || value <= 0) return null;
-			const breakdownEntries = getHeapSnapshotBreakdownEntries(category);
-			const breakdownTotal = breakdownEntries.reduce((sum, [, childValue]) => sum + childValue, 0);
-			const percent = (value * 100) / total;
-			const childEntries = [];
-			let otherPercent = 0;
-
-			if (breakdownTotal > 0 && percent > heapSnapshotSankeyParentMinPercent) {
-				for (const [childName, childValue] of breakdownEntries) {
-					const childRatio = childValue / breakdownTotal;
-					const childPercent = percent * childRatio;
-					if (childRatio >= heapSnapshotSankeyChildMinRatio) {
-						childEntries.push([formatHeapSnapshotSankeyChildLabel(childName), childPercent]);
-					} else {
-						otherPercent += childPercent;
-					}
-				}
-
-				if (childEntries.length > 0 && otherPercent > 0) {
-					childEntries.push(['Other', otherPercent]);
-				}
-			}
-
-			return {
-				category,
-				percent,
-				childEntries,
-			};
-		})
-		.filter(value => value != null);
-
-	if (categories.length === 0) return null;
-
-	const nodeColors = {
-		[title]: heapSnapshotCategory.total.colorHex,
-	} as Record<string, string>;
-	for (const { category, childEntries } of categories) {
-		const categoryColor = heapSnapshotCategory[category].colorHex;
-		nodeColors[category] = categoryColor;
-
-		for (const [childName] of childEntries) {
-			nodeColors[childName] = categoryColor;
-		}
-	}
-
-	const lines = [
-		`<details><summary>${title} heap snapshot composition</summary>`,
-		'',
-		'```mermaid',
-		`%%{init: ${JSON.stringify({
-			sankey: {
-				showValues: false,
-				linkColor: 'target',
-				labelStyle: 'outlined',
-				nodeAlignment: 'center',
-				nodePadding: 10,
-				nodeColors: {
-					...nodeColors,
-					'Other': '#888888',
-				},
-			},
-		})}}%%`,
-		'sankey-beta',
-	];
-
-	for (const { category, percent, childEntries } of categories) {
-		lines.push(`${escapeCsvValue(title)},${escapeCsvValue(heapSnapshotCategory[category].label)},${formatSankeyPercentValue(percent)}`);
-
-		for (const [childName, childPercent] of childEntries) {
-			lines.push(`${escapeCsvValue(heapSnapshotCategory[category].label)},${escapeCsvValue(childName)},${formatSankeyPercentValue(childPercent)}`);
-		}
-	}
-
-	lines.push('```');
-	lines.push('');
-	lines.push('</details>');
-
-	return lines.join('\n');
-}

.github/scripts/measure-backend-memory-comparison.mts

@@ -1,309 +0,0 @@
-/*
- * SPDX-FileCopyrightText: syuilo and misskey-project
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-import { createRequire } from 'node:module';
-import { copyFile, rm, writeFile } from 'node:fs/promises';
-import { join, resolve } from 'node:path';
-import * as util from './utility.mts';
-import * as heapSnapshotUtil from './heap-snapshot-util.mts';
-import type { MemoryReportRaw } from '../../packages/backend/scripts/measure-memory.mts';
-
-const phases = ['afterGc'] as const;
-
-export type MemoryReport = {
-	timestamp: string;
-	sampleCount: any;
-	aggregation: string;
-	measurement: {
-		startupTimeoutMs: any;
-		memorySettleTimeMs: any;
-		ipcTimeoutMs: any;
-		requestCount: any;
-		heapSnapshot: {
-			enabled: any;
-			timeoutMs: any;
-			breakdownTopN: any;
-		};
-	};
-	summary: Record<typeof phases[number], {
-		memoryUsage: Record<string, number>;
-		heapSnapshot?: heapSnapshotUtil.HeapSnapshotData;
-	}>;
-	samples: (MemoryReportRaw['samples'][number] & {
-		round: number;
-	})[];
-};
-
-const [baseDirArg, headDirArg, baseOutputArg, headOutputArg] = process.argv.slice(2);
-
-const HEAP_SNAPSHOT_BREAKDOWN_TOP_N = util.readIntegerEnv('MK_MEMORY_HEAP_SNAPSHOT_BREAKDOWN_TOP_N', 6, 1);
-const HEAD_HEAP_SNAPSHOT_WORK_DIR = resolve('head-heap-snapshots');
-const HEAD_HEAP_SNAPSHOT_OUTPUT_PATH = resolve('head-heap-snapshot.heapsnapshot');
-
-async function resetState(repoDir: string) {
-	const require = createRequire(join(repoDir, 'packages/backend/package.json'));
-	const pg = require('pg');
-	const Redis = require('ioredis');
-
-	const postgres = new pg.Client({
-		host: '127.0.0.1',
-		port: 54312,
-		database: 'postgres',
-		user: 'postgres',
-	});
-
-	await postgres.connect();
-	try {
-		await postgres.query('DROP DATABASE IF EXISTS "test-misskey" WITH (FORCE)');
-		await postgres.query('CREATE DATABASE "test-misskey"');
-	} finally {
-		await postgres.end();
-	}
-
-	const redis = new Redis({ host: '127.0.0.1', port: 56312 });
-	try {
-		await redis.flushall();
-	} finally {
-		redis.disconnect();
-	}
-}
-
-function summarizeHeapSnapshotBreakdowns(samples: MemoryReport['samples'], phase: typeof phases[number]) {
-	const breakdowns = {} as Record<keyof typeof heapSnapshotUtil.heapSnapshotCategory, Record<string, number>>;
-
-	for (const category of Object.keys(heapSnapshotUtil.heapSnapshotCategory) as (keyof typeof heapSnapshotUtil.heapSnapshotCategory)[]) {
-		if (category === 'total') continue;
-
-		const childKeys = new Set<string>();
-		for (const sample of samples) {
-			for (const childKey of Object.keys(sample.phases[phase].heapSnapshot?.breakdowns?.[category] ?? {})) {
-				childKeys.add(childKey);
-			}
-		}
-
-		const categoryBreakdown = {} as Record<string, number>;
-		for (const childKey of childKeys) {
-			const values = samples
-				.map(sample => sample.phases[phase].heapSnapshot?.breakdowns?.[category]?.[childKey])
-				.filter(value => Number.isFinite(value)) as number[];
-
-			if (values.length > 0) categoryBreakdown[childKey] = util.median(values);
-		}
-
-		if (Object.keys(categoryBreakdown).length > 0) {
-			breakdowns[category] = collapseHeapSnapshotBreakdown(categoryBreakdown);
-		}
-	}
-
-	return breakdowns;
-}
-
-function collapseHeapSnapshotBreakdown(breakdown: Record<string, number>) {
-	const entries = Object.entries(breakdown)
-		.filter(([, value]) => value > 0)
-		.toSorted((a, b) => b[1] - a[1]);
-
-	const topEntries = entries.slice(0, HEAP_SNAPSHOT_BREAKDOWN_TOP_N);
-	const otherValue = entries
-		.slice(HEAP_SNAPSHOT_BREAKDOWN_TOP_N)
-		.reduce((sum, [, value]) => sum + value, 0);
-
-	const collapsed = Object.fromEntries(topEntries);
-	if (otherValue > 0) collapsed.Other = otherValue;
-	return collapsed;
-}
-
-function summarizeSamples(samples: MemoryReport['samples']) {
-	const summary = {} as MemoryReport['summary'];
-
-	for (const phase of phases) {
-		summary[phase] = {
-			memoryUsage: {},
-		};
-
-		const metricKeys = new Set<string>();
-		for (const sample of samples) {
-			for (const key of Object.keys(sample.phases[phase].memoryUsage)) {
-				metricKeys.add(key);
-			}
-		}
-
-		for (const key of metricKeys) {
-			const values = samples.map(sample => sample.phases[phase].memoryUsage[key]);
-			summary[phase].memoryUsage[key] = util.median(values);
-		}
-
-		const heapSnapshotCategoryValues = {} as Record<keyof typeof heapSnapshotUtil.heapSnapshotCategory, number>;
-		for (const category of Object.keys(heapSnapshotUtil.heapSnapshotCategory) as (keyof typeof heapSnapshotUtil.heapSnapshotCategory)[]) {
-			const values = samples
-				.map(sample => sample.phases[phase].heapSnapshot?.categories?.[category])
-				.filter(value => Number.isFinite(value)) as number[];
-
-			if (values.length > 0) heapSnapshotCategoryValues[category] = util.median(values);
-		}
-
-		const heapSnapshotNodeCountValues = {} as Record<keyof typeof heapSnapshotUtil.heapSnapshotCategory, number>;
-		for (const category of Object.keys(heapSnapshotUtil.heapSnapshotCategory) as (keyof typeof heapSnapshotUtil.heapSnapshotCategory)[]) {
-			const values = samples
-				.map(sample => sample.phases[phase].heapSnapshot?.nodeCounts?.[category])
-				.filter(value => Number.isFinite(value)) as number[];
-
-			if (values.length > 0) heapSnapshotNodeCountValues[category] = util.median(values);
-		}
-
-		if (Object.keys(heapSnapshotCategoryValues).length > 0) {
-			const heapSnapshotBreakdowns = summarizeHeapSnapshotBreakdowns(samples, phase);
-
-			summary[phase].heapSnapshot = {
-				categories: heapSnapshotCategoryValues,
-				nodeCounts: heapSnapshotNodeCountValues,
-				...(Object.keys(heapSnapshotBreakdowns).length > 0 ? { breakdowns: heapSnapshotBreakdowns } : {}),
-			};
-		}
-	}
-
-	return summary;
-}
-
-async function measureRepo(label: string, repoDir: string, round: number, options: { heapSnapshotSavePath?: string } = {}) {
-	process.stderr.write(`[${label}] Resetting database and Redis\n`);
-	await resetState(repoDir);
-
-	process.stderr.write(`[${label}] Running migrations\n`);
-	await util.run('pnpm', ['--filter', 'backend', 'migrate'], {
-		cwd: repoDir,
-		env: process.env,
-		logStdout: true,
-	});
-
-	process.stderr.write(`[${label}] Measuring memory\n`);
-	const measureEnv = {
-		...process.env,
-		MK_MEMORY_SAMPLE_COUNT: '1',
-	} as NodeJS.ProcessEnv;
-	if (round <= 0) measureEnv.MK_MEMORY_HEAP_SNAPSHOT = '0';
-	if (options.heapSnapshotSavePath != null) measureEnv.MK_MEMORY_HEAP_SNAPSHOT_SAVE_PATH = options.heapSnapshotSavePath;
-
-	const stdout = await util.run('node', ['packages/backend/scripts/measure-memory.mts'], {
-		cwd: repoDir,
-		env: measureEnv,
-	});
-
-	const report = JSON.parse(stdout) as MemoryReportRaw;
-	const sample = report.samples[0];
-
-	return sample;
-}
-
-function headHeapSnapshotPath(round: number) {
-	return join(HEAD_HEAP_SNAPSHOT_WORK_DIR, `round-${round}.heapsnapshot`);
-}
-
-function selectRepresentativeHeadHeapSnapshotRound(samples: MemoryReport['samples'], summary: MemoryReport['summary']) {
-	const medianTotal = summary.afterGc.heapSnapshot?.categories?.total;
-	if (medianTotal == null || !Number.isFinite(medianTotal)) return null;
-
-	let selected: { round: number; distance: number } | null = null;
-	for (const sample of samples) {
-		const total = sample.phases.afterGc.heapSnapshot?.categories?.total;
-		if (total == null || !Number.isFinite(total)) continue;
-
-		const distance = Math.abs(total - medianTotal);
-		if (selected == null || distance < selected.distance || (distance === selected.distance && sample.round < selected.round)) {
-			selected = {
-				round: sample.round,
-				distance,
-			};
-		}
-	}
-
-	return selected?.round ?? null;
-}
-
-async function saveRepresentativeHeadHeapSnapshot(samples: MemoryReport['samples'], summary: MemoryReport['summary']) {
-	const round = selectRepresentativeHeadHeapSnapshotRound(samples, summary);
-	if (round == null) return;
-
-	await copyFile(headHeapSnapshotPath(round), HEAD_HEAP_SNAPSHOT_OUTPUT_PATH);
-	process.stderr.write(`Selected head heap snapshot round ${round} for artifact\n`);
-	await rm(HEAD_HEAP_SNAPSHOT_WORK_DIR, { recursive: true, force: true });
-}
-
-async function main() {
-	const baseDir = resolve(baseDirArg);
-	const headDir = resolve(headDirArg);
-	const baseOutput = resolve(baseOutputArg);
-	const headOutput = resolve(headOutputArg);
-	const rounds = util.readIntegerEnv('MK_MEMORY_COMPARE_ROUNDS', 5, 1);
-	const warmupRounds = util.readIntegerEnv('MK_MEMORY_COMPARE_WARMUP_ROUNDS', 1, 0);
-	const startedAt = new Date().toISOString();
-
-	await rm(HEAD_HEAP_SNAPSHOT_WORK_DIR, { recursive: true, force: true });
-	await rm(HEAD_HEAP_SNAPSHOT_OUTPUT_PATH, { force: true });
-
-	const reports = {
-		base: {
-			dir: baseDir,
-			samples: [] as MemoryReport['samples'],
-		},
-		head: {
-			dir: headDir,
-			samples: [] as MemoryReport['samples'],
-		},
-	};
-
-	for (let round = 1; round <= warmupRounds; round++) {
-		process.stderr.write(`Starting warmup round ${round}/${warmupRounds}\n`);
-		for (const label of ['base', 'head'] as const) {
-			await measureRepo(label, reports[label].dir, -round);
-		}
-	}
-
-	for (let round = 1; round <= rounds; round++) {
-		const order = round % 2 === 1 ? ['base', 'head'] as const : ['head', 'base'] as const;
-		process.stderr.write(`Starting measurement round ${round}/${rounds}: ${order.join(' -> ')}\n`);
-
-		for (const label of order) {
-			const shouldSaveHeadHeapSnapshot = label === 'head';
-			const options = shouldSaveHeadHeapSnapshot
-				? { heapSnapshotSavePath: headHeapSnapshotPath(round) }
-				: {};
-			const sample = await measureRepo(label, reports[label].dir, round, options);
-			reports[label].samples.push({
-				...sample,
-				round,
-			});
-		}
-	}
-
-	const summaries = {
-		base: summarizeSamples(reports.base.samples),
-		head: summarizeSamples(reports.head.samples),
-	};
-	await saveRepresentativeHeadHeapSnapshot(reports.head.samples, summaries.head);
-
-	for (const label of ['base', 'head'] as const) {
-		const report = {
-			timestamp: new Date().toISOString(),
-			sampleCount: reports[label].samples.length,
-			aggregation: 'median',
-			comparison: {
-				strategy: 'interleaved-pairs',
-				rounds,
-				warmupRounds,
-				startedAt,
-			},
-			summary: summaries[label],
-			samples: reports[label].samples,
-		};
-
-		await writeFile(label === 'base' ? baseOutput : headOutput, `${JSON.stringify(report, null, 2)}\n`);
-	}
-}
-
-main().catch(err => {
-	console.error(err);
-	process.exit(1);
-});

.github/scripts/utility.mts

@@ -1,204 +0,0 @@
-/*
- * SPDX-FileCopyrightText: syuilo and misskey-project
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-// NOTE: このファイルはworkflow上でバックエンドからも参照されるため、side effectがあってはならない
-
-import { spawn } from 'node:child_process';
-import { promises as fs } from 'node:fs';
-import path from 'node:path';
-
-export function median(values: number[]) {
-	const sorted = values.toSorted((a, b) => a - b);
-	const center = Math.floor(sorted.length / 2);
-	if (sorted.length % 2 === 1) return sorted[center];
-	return Math.round((sorted[center - 1] + sorted[center]) / 2);
-}
-
-export function mad(values: number[]) {
-	if (values.length < 2) throw new Error('Not enough samples to calculate MAD');
-
-	const center = median(values);
-	return median(values.map(value => Math.abs(value - center)));
-}
-
-function getSamplesByRound<T extends { round: number; }[]>(samples: T) {
-	const samplesByRound = new Map<number, T[number]>();
-	for (const sample of samples) {
-		if (sample.round <= 0) continue;
-		samplesByRound.set(sample.round, sample);
-	}
-	return samplesByRound;
-}
-
-export function pairedDeltaSummary<T extends { round: number; }[]>(baseSamples: T, headSamples: T, getValue: (sample: T[number]) => number | null) {
-	const baseSamplesByRound = getSamplesByRound(baseSamples);
-	const headSamplesByRound = getSamplesByRound(headSamples);
-	const values = [];
-
-	for (const [round, baseSample] of baseSamplesByRound) {
-		const headSample = headSamplesByRound.get(round);
-		if (headSample == null) continue;
-
-		const baseValue = getValue(baseSample);
-		const headValue = getValue(headSample);
-		if (baseValue == null || headValue == null) continue;
-
-		values.push(headValue - baseValue);
-	}
-
-	return {
-		median: median(values),
-		mad: mad(values),
-		min: Math.min(...values),
-		max: Math.max(...values),
-		samples: values.length,
-	};
-}
-
-export function normalizePath(filePath: string) {
-	return filePath.split(path.sep).join('/');
-}
-
-export async function fileExists(filePath: string) {
-	try {
-		await fs.access(filePath);
-		return true;
-	} catch {
-		return false;
-	}
-}
-
-export async function fileSize(filePath: string) {
-	const stat = await fs.stat(filePath);
-	return stat.size;
-}
-
-export async function* traverseDirectory(dir: string): AsyncGenerator<string> {
-	for (const entry of await fs.readdir(dir, { withFileTypes: true })) {
-		const fullPath = path.join(dir, entry.name);
-		if (entry.isDirectory()) {
-			yield* traverseDirectory(fullPath);
-		} else if (entry.isFile()) {
-			yield fullPath;
-		}
-	}
-}
-
-export function escapeLatex(text: string) {
-	return text
-		.replaceAll('\\', '\\\\')
-		.replaceAll('{', '\\{')
-		.replaceAll('}', '\\}')
-		.replaceAll('%', '\\%');
-}
-
-export function formatColoredDelta(delta: number, text: (value: number) => string, colorThreshold = 0) {
-	if (delta === 0) return text(0);
-	const sign = delta > 0 ? '+' : '-';
-	if (Math.abs(delta) < colorThreshold) return `$\\text{${sign}${escapeLatex(text(Math.abs(delta)))}}$`;
-	const color = delta > 0 ? 'orange' : 'green';
-	return `$\\color{${color}}{\\text{${sign}${escapeLatex(text(Math.abs(delta)))}}}$`;
-}
-
-const numberFormatter = new Intl.NumberFormat('en-US', {
-	maximumFractionDigits: 1,
-});
-
-export function formatNumber(value: number) {
-	return numberFormatter.format(value);
-}
-
-export function formatBytes(value: number) {
-	if (value === 0) return '0 B';
-	const units = ['B', 'KB', 'MB', 'GB'];
-	let unitIndex = 0;
-	let size = value;
-	while (size >= 1000 && unitIndex < units.length - 1) {
-		size /= 1000;
-		unitIndex += 1;
-	}
-
-	const maximumFractionDigits = size >= 10 || unitIndex === 0 ? 0 : 1;
-	return `${numberFormatter.format(Number(size.toFixed(maximumFractionDigits)))} ${units[unitIndex]}`;
-}
-
-export function calcAndFormatDeltaNumber(before: number, after: number, colorThreshold = 0) {
-	if (before == null || after == null) return '-';
-	const delta = after - before;
-	return formatColoredDelta(delta, v => formatNumber(v), colorThreshold);
-}
-
-export function formatDeltaBytes(deltaBytes: number, colorThreshold = 0) {
-	return formatColoredDelta(deltaBytes, v => formatBytes(v), colorThreshold);
-}
-
-export function calcAndFormatDeltaBytes(before: number, after: number, colorThreshold = 0) {
-	if (before == null || after == null) return '-';
-	const delta = after - before;
-	return formatDeltaBytes(delta, colorThreshold);
-}
-
-export function formatPercent(value: number) {
-	return `${formatNumber(value)}%`;
-}
-
-export function formatDeltaPercent(deltaPercent: number, colorThreshold = 0) {
-	return formatColoredDelta(deltaPercent, v => formatPercent(v), colorThreshold);
-}
-
-export function calcAndFormatDeltaPercent(before: number, after: number, colorThreshold = 0) {
-	if (before == null || before === 0 || after == null || after === 0) return '-';
-	const delta = after - before;
-	return formatDeltaPercent(delta / before * 100, colorThreshold);
-}
-
-export function commandName(command: string) {
-	if (process.platform !== 'win32') return command;
-	if (command === 'pnpm') return 'pnpm.cmd';
-	return command;
-}
-
-export function readIntegerEnv(name: string, defaultValue: number, min: number) {
-	const rawValue = process.env[name];
-	if (rawValue == null || rawValue === '') return defaultValue;
-	if (!/^\d+$/.test(rawValue)) throw new Error(`${name} must be an integer`);
-
-	const value = Number(rawValue);
-	if (!Number.isSafeInteger(value) || value < min) throw new Error(`${name} must be >= ${min}`);
-	return value;
-}
-
-export function run(command: string, args: string[], options: { cwd?: string; env?: NodeJS.ProcessEnv; logStdout?: boolean } = {}) {
-	return new Promise<string>((resolvePromise, reject) => {
-		const child = spawn(commandName(command), args, {
-			cwd: options.cwd,
-			env: options.env,
-			stdio: ['ignore', 'pipe', 'pipe'],
-		});
-
-		let stdout = '';
-		let stderr = '';
-
-		child.stdout.on('data', data => {
-			stdout += data;
-			if (options.logStdout) process.stderr.write(data);
-		});
-
-		child.stderr.on('data', data => {
-			stderr += data;
-			process.stderr.write(data);
-		});
-
-		child.on('error', reject);
-
-		child.on('close', code => {
-			if (code === 0) {
-				resolvePromise(stdout);
-			} else {
-				reject(new Error(`${command} ${args.join(' ')} failed with exit code ${code}\n${stderr}`));
-			}
-		});
-	});
-}

.github/workflows/backend-diagnostics.comment.yml

@@ -1,10 +1,10 @@
-name: Report backend memory
+name: Backend diagnostics (comment)
 
 on:
   workflow_run:
     types: [completed]
     workflows:
-      - Get backend memory usage # get-backend-memory.yml
+      - Backend diagnostics (inspect) # backend-diagnostics.inspect.yml
 
 jobs:
   compare-memory:
@@ -19,6 +19,16 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v6.0.3
 
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v6.0.9
+      - name: Use Node.js
+        uses: actions/setup-node@v6.4.0
+        with:
+          node-version-file: '.node-version'
+          cache: 'pnpm'
+      - name: Install dependencies
+        run: pnpm --filter diagnostics-backend... install --frozen-lockfile
+
       - name: Download artifacts
         uses: actions/download-artifact@v8
         with:
@@ -33,9 +43,9 @@ jobs:
       - name: Load PR Number
         id: load-pr-num
         run: echo "pr-number=$(cat artifacts/pr_number)" >> "$GITHUB_OUTPUT"
-      - name: Find head heap snapshot artifact
-        id: find-heap-snapshot-artifact
-        uses: actions/github-script@v8
+      - name: Find heap snapshot artifacts
+        id: find-heap-snapshot-artifacts
+        uses: actions/github-script@v9
         with:
           script: |
             const { owner, repo } = context.repo;
@@ -45,15 +55,26 @@ jobs:
               repo,
               run_id,
             });
-            const artifact = artifacts.find(artifact => artifact.name === 'backend-memory-head-heap-snapshot');
-            if (artifact == null) return;
-            core.setOutput('url', `https://github.com/${owner}/${repo}/actions/runs/${run_id}/artifacts/${artifact.id}`);
+            const artifactNames = {
+              base: 'base-heap-snapshot.heapsnapshot',
+              head: 'head-heap-snapshot.heapsnapshot',
+            };
+            for (const [label, artifactName] of Object.entries(artifactNames)) {
+              const artifact = artifacts.find(artifact => artifact.name === artifactName);
+              if (artifact == null) throw new Error(`Artifact not found: ${artifactName}`);
+              core.setOutput(`${label}-url`, `https://github.com/${owner}/${repo}/actions/runs/${run_id}/artifacts/${artifact.id}`);
+            }
 
       - id: build-comment
         name: Build memory comment
         env:
-          MK_MEMORY_HEAP_SNAPSHOT_ARTIFACT_URL_HEAD: ${{ steps.find-heap-snapshot-artifact.outputs.url }}
-        run: node .github/scripts/backend-memory-report.mts ./artifacts/memory-base.json ./artifacts/memory-head.json ./output.md ./artifacts/js-footprint-base.json ./artifacts/js-footprint-head.json
+          MK_MEMORY_HEAP_SNAPSHOT_ARTIFACT_URL_BASE: ${{ steps.find-heap-snapshot-artifacts.outputs.base-url }}
+          MK_MEMORY_HEAP_SNAPSHOT_ARTIFACT_URL_HEAD: ${{ steps.find-heap-snapshot-artifacts.outputs.head-url }}
+        run: >-
+          pnpm --filter diagnostics-backend run render-md
+          "$GITHUB_WORKSPACE/artifacts/memory-base.json"
+          "$GITHUB_WORKSPACE/artifacts/memory-head.json"
+          "$GITHUB_WORKSPACE/output.md"
       - uses: thollander/actions-comment-pull-request@v3
         with:
           pr-number: ${{ steps.load-pr-num.outputs.pr-number }}
@@ -64,6 +85,6 @@ jobs:
         if: failure() && steps.load-pr-num.outputs.pr-number
         with:
           pr-number: ${{ steps.load-pr-num.outputs.pr-number }}
-          comment-tag: show_memory_diff_error
+          comment-tag: show_memory_diff
           message: |
             An error occurred while comparing backend memory usage. See [workflow logs](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}) for details.

.github/workflows/backend-diagnostics.inspect.yml

@@ -1,5 +1,5 @@
-# this name is used in report-backend-memory.yml so be careful when change name
-name: Get backend memory usage
+# this name is used in backend-diagnostics.comment.yml so be careful when change name
+name: Backend diagnostics (inspect)
 
 on:
   pull_request:
@@ -9,14 +9,10 @@ on:
     paths:
       - packages/backend/**
       - packages/misskey-js/**
-      - .github/scripts/utility.mts
-      - .github/scripts/backend-memory-report.mts
-      - .github/scripts/measure-backend-memory-comparison.mts
-      - .github/scripts/backend-js-footprint.mjs
-      - .github/scripts/backend-js-footprint-loader.mjs
-      - .github/scripts/backend-js-footprint-require.cjs
-      - .github/workflows/get-backend-memory.yml
-      - .github/workflows/report-backend-memory.yml
+      - packages-private/diagnostics-shared/**
+      - packages-private/diagnostics-backend/**
+      - .github/workflows/backend-diagnostics.inspect.yml
+      - .github/workflows/backend-diagnostics.comment.yml
 
 jobs:
   get-memory-usage:
@@ -91,22 +87,32 @@ jobs:
       working-directory: head
       run: pnpm build
     - name: Measure backend memory usage
+      working-directory: head
       env:
-        MK_MEMORY_COMPARE_ROUNDS: 5
+        MK_MEMORY_COMPARE_ROUNDS: 15
         MK_MEMORY_COMPARE_WARMUP_ROUNDS: 1
         MK_MEMORY_HEAP_SNAPSHOT: 1
-      run: node head/.github/scripts/measure-backend-memory-comparison.mts base head memory-base.json memory-head.json
+        MK_MEMORY_HEAP_SNAPSHOT_ROUNDS: 3
+        # 計測ハーネスはhead側のものを両方に使うが、成果物はrunnerのworkspace直下に出す
+        MK_MEMORY_HEAP_SNAPSHOT_OUTPUT_DIR: ${{ github.workspace }}
+      run: >-
+        pnpm --filter diagnostics-backend run inspect
+        "$GITHUB_WORKSPACE/base" "$GITHUB_WORKSPACE/head"
+        "$GITHUB_WORKSPACE/memory-base.json" "$GITHUB_WORKSPACE/memory-head.json"
+    - name: Upload base heap snapshot
+      uses: actions/upload-artifact@v7
+      with:
+        path: base-heap-snapshot.heapsnapshot
+        archive: false
+        if-no-files-found: error
+        retention-days: 7
     - name: Upload head heap snapshot
       uses: actions/upload-artifact@v7
       with:
-        name: backend-memory-head-heap-snapshot
         path: head-heap-snapshot.heapsnapshot
+        archive: false
         if-no-files-found: error
         retention-days: 7
-    - name: Measure backend loaded JS footprint
-      run: |
-        node head/.github/scripts/backend-js-footprint.mjs base js-footprint-base.json
-        node head/.github/scripts/backend-js-footprint.mjs head js-footprint-head.json
     - name: Upload Artifact
       uses: actions/upload-artifact@v7
       with:
@@ -114,8 +120,6 @@ jobs:
         path: |
           memory-base.json
           memory-head.json
-          js-footprint-base.json
-          js-footprint-head.json
 
   save-pr-number:
     runs-on: ubuntu-latest

.github/workflows/changelog-check.yml

@@ -13,10 +13,15 @@ jobs:
     steps:
       - name: Checkout head
         uses: actions/checkout@v6.0.3
-      - name: Setup Node.js
+
+      - name: setup pnpm
+        uses: pnpm/action-setup@v6
+
+      - name: setup node
         uses: actions/setup-node@v6.4.0
         with:
           node-version-file: '.node-version'
+          cache: pnpm
 
       - name: Checkout base
         run: |
@@ -27,17 +32,16 @@ jobs:
           git checkout origin/${{ github.base_ref }} CHANGELOG.md
 
       - name: Copy to Checker directory for CHANGELOG-base.md
-        run: cp _base/CHANGELOG.md scripts/changelog-checker/CHANGELOG-base.md
+        run: cp _base/CHANGELOG.md packages-private/changelog-checker/CHANGELOG-base.md
       - name: Copy to Checker directory for CHANGELOG-head.md
-        run: cp CHANGELOG.md scripts/changelog-checker/CHANGELOG-head.md
+        run: cp CHANGELOG.md packages-private/changelog-checker/CHANGELOG-head.md
       - name: diff
         continue-on-error: true
         run: diff -u CHANGELOG-base.md CHANGELOG-head.md
-        working-directory: scripts/changelog-checker
+        working-directory: packages-private/changelog-checker
+
+      - name: Install dependencies
+        run: pnpm --filter changelog-checker... install --frozen-lockfile
 
-      - name: Setup Checker
-        run: npm install
-        working-directory: scripts/changelog-checker
       - name: Run Checker
-        run: npm run run
-        working-directory: scripts/changelog-checker
+        run: pnpm --filter changelog-checker check

.github/workflows/frontend-bundle-report-comment.yml

@@ -1,318 +0,0 @@
-name: frontend-bundle-report-comment
-
-on:
-  workflow_run:
-    workflows:
-      - frontend-bundle-report
-    types:
-      - completed
-  pull_request_target:
-    types:
-      - opened
-      - synchronize
-      - reopened
-      - ready_for_review
-    paths:
-      - packages/frontend/**
-      - packages/frontend-shared/**
-      - packages/frontend-builder/**
-      - packages/i18n/**
-      - packages/icons-subsetter/**
-      - packages/misskey-js/**
-      - packages/misskey-reversi/**
-      - packages/misskey-bubble-game/**
-      - package.json
-      - pnpm-lock.yaml
-      - pnpm-workspace.yaml
-      - .node-version
-      - .github/scripts/utility.mts
-      - .github/scripts/frontend-js-size.mts
-      - .github/workflows/frontend-bundle-report.yml
-      - .github/workflows/frontend-bundle-report-comment.yml
-
-permissions:
-  actions: read
-  contents: read
-  issues: write
-  pull-requests: write
-
-jobs:
-  comment:
-    name: Comment frontend bundle report
-    if: github.event_name == 'pull_request_target' || (github.event.workflow_run.event == 'pull_request' && github.event.workflow_run.conclusion == 'success')
-    runs-on: ubuntu-latest
-    concurrency:
-      group: frontend-bundle-report-comment-${{ github.event.pull_request.number || github.event.workflow_run.id }}
-      cancel-in-progress: true
-    steps:
-      - name: Find bundle report run
-        if: github.event_name == 'pull_request_target'
-        id: find-report-run
-        uses: actions/github-script@v9
-        with:
-          script: |
-            const workflow_id = 'frontend-bundle-report.yml';
-            const artifactName = 'frontend-bundle-report';
-            const headSha = context.payload.pull_request.head.sha;
-            const prNumber = context.payload.pull_request.number;
-            const pollIntervalMs = 30_000;
-            const timeoutMs = 90 * 60_000;
-            const startedAt = Date.now();
-            const { owner, repo } = context.repo;
-
-            async function listReportWorkflowRuns() {
-              const runsForHead = await github.paginate(github.rest.actions.listWorkflowRuns, {
-                owner,
-                repo,
-                workflow_id,
-                event: 'pull_request',
-                head_sha: headSha,
-                per_page: 100,
-              });
-
-              if (runsForHead.length > 0) {
-                return runsForHead;
-              }
-
-              const recentRuns = await github.paginate(github.rest.actions.listWorkflowRuns, {
-                owner,
-                repo,
-                workflow_id,
-                event: 'pull_request',
-                per_page: 100,
-              });
-              return recentRuns.filter((run) =>
-                run.pull_requests?.some((pullRequest) => pullRequest.number === prNumber));
-            }
-
-            async function findReportRun() {
-              const runs = (await listReportWorkflowRuns())
-                .sort((a, b) => new Date(b.updated_at) - new Date(a.updated_at));
-
-              for (const run of runs) {
-                if (run.status !== 'completed') continue;
-                if (run.conclusion !== 'success') {
-                  core.warning(`Frontend bundle report run ${run.id} completed with conclusion: ${run.conclusion}`);
-                  return { done: true, run: null };
-                }
-
-                const artifacts = await github.paginate(github.rest.actions.listWorkflowRunArtifacts, {
-                  owner,
-                  repo,
-                  run_id: run.id,
-                  per_page: 100,
-                });
-                const report = artifacts.find((artifact) => artifact.name === artifactName && !artifact.expired);
-                if (report) return { done: true, run };
-
-                core.info(`Frontend bundle report run ${run.id} did not produce ${artifactName}.`);
-                return { done: true, run: null };
-              }
-
-              return { done: false, run: null };
-            }
-
-            while (Date.now() - startedAt < timeoutMs) {
-              const { done, run } = await findReportRun();
-              if (run) {
-                core.info(`Found frontend bundle report on workflow run ${run.id}.`);
-                core.setOutput('run-id', String(run.id));
-                return;
-              }
-              if (done) {
-                return;
-              }
-
-              core.info('Waiting for frontend bundle report artifact...');
-              await new Promise((resolve) => setTimeout(resolve, pollIntervalMs));
-            }
-
-            core.warning(`Timed out waiting for ${artifactName} from ${workflow_id} for ${headSha}.`);
-
-      - name: Find bundle report artifact
-        if: github.event_name == 'workflow_run'
-        id: find-report-artifact
-        uses: actions/github-script@v9
-        with:
-          script: |
-            const artifactName = 'frontend-bundle-report';
-            const { owner, repo } = context.repo;
-            const artifacts = await github.paginate(github.rest.actions.listWorkflowRunArtifacts, {
-              owner,
-              repo,
-              run_id: context.payload.workflow_run.id,
-              per_page: 100,
-            });
-            const report = artifacts.find((artifact) => artifact.name === artifactName && !artifact.expired);
-            if (report) {
-              core.setOutput('exists', 'true');
-            } else {
-              core.info(`Workflow run ${context.payload.workflow_run.id} did not produce ${artifactName}.`);
-              core.setOutput('exists', 'false');
-            }
-
-      - name: Download bundle report from workflow_run
-        if: github.event_name == 'workflow_run' && steps.find-report-artifact.outputs.exists == 'true'
-        uses: actions/download-artifact@v8
-        with:
-          name: frontend-bundle-report
-          path: ${{ runner.temp }}/frontend-bundle-report
-          github-token: ${{ github.token }}
-          repository: ${{ github.repository }}
-          run-id: ${{ github.event.workflow_run.id }}
-
-      - name: Download bundle report from pull_request_target
-        if: github.event_name == 'pull_request_target' && steps.find-report-run.outputs.run-id != ''
-        uses: actions/download-artifact@v8
-        with:
-          name: frontend-bundle-report
-          path: ${{ runner.temp }}/frontend-bundle-report
-          github-token: ${{ github.token }}
-          repository: ${{ github.repository }}
-          run-id: ${{ steps.find-report-run.outputs.run-id }}
-
-      - name: Comment on pull request
-        if: (github.event_name == 'workflow_run' && steps.find-report-artifact.outputs.exists == 'true') || steps.find-report-run.outputs.run-id != ''
-        uses: actions/github-script@v9
-        with:
-          github-token: ${{ secrets.FRONTEND_BUNDLE_REPORT_COMMENT_TOKEN || secrets.FRONTEND_JS_SIZE_COMMENT_TOKEN || secrets.FRONTEND_BUNDLE_VISUALIZER_COMMENT_TOKEN || github.token }}
-          script: |
-            const fs = require('node:fs');
-            const path = require('node:path');
-
-            const jsSizeMarker = '<!-- misskey-frontend-js-size -->';
-            const visualizerMarker = '<!-- misskey-frontend-bundle-visualizer -->';
-            const reportMarkers = [jsSizeMarker, visualizerMarker];
-            const reportDir = path.join(process.env.RUNNER_TEMP, 'frontend-bundle-report');
-            const jsSizeReportPath = path.join(reportDir, 'frontend-js-size-report.md');
-            const prNumberPath = path.join(reportDir, 'pr-number.txt');
-            const headShaPath = path.join(reportDir, 'head-sha.txt');
-            const workflowRun = context.payload.workflow_run;
-            const pullRequest = context.payload.pull_request;
-            const eventHeadSha = workflowRun?.head_sha ?? pullRequest?.head?.sha ?? null;
-            const { owner, repo } = context.repo;
-
-            if (!fs.existsSync(jsSizeReportPath)) {
-              core.setFailed('The frontend bundle report artifact does not contain frontend-js-size-report.md.');
-              return;
-            }
-
-            const artifactHeadSha = fs.existsSync(headShaPath)
-              ? fs.readFileSync(headShaPath, 'utf8').trim()
-              : null;
-            if (eventHeadSha != null && artifactHeadSha != null && artifactHeadSha !== eventHeadSha) {
-              core.info(`The artifact head SHA (${artifactHeadSha}) differs from the event head SHA (${eventHeadSha}). Using artifact metadata for PR validation.`);
-            }
-            const reportHeadSha = artifactHeadSha ?? eventHeadSha;
-
-            const artifactPrNumber = fs.existsSync(prNumberPath)
-              ? Number(fs.readFileSync(prNumberPath, 'utf8').trim())
-              : null;
-            let issue_number = null;
-            if (pullRequest != null) {
-              issue_number = pullRequest.number;
-              if (Number.isInteger(artifactPrNumber) && artifactPrNumber !== issue_number) {
-                core.setFailed(`The artifact pull request number (${artifactPrNumber}) does not match the event pull request number (${issue_number}).`);
-                return;
-              }
-            } else if (workflowRun != null) {
-              const associatedPullRequests = new Map();
-              for (const pullRequest of workflowRun.pull_requests ?? []) {
-                if (Number.isInteger(pullRequest.number)) {
-                  associatedPullRequests.set(pullRequest.number, pullRequest);
-                }
-              }
-
-              if (reportHeadSha != null) {
-                const pullRequestsForCommit = await github.paginate(github.rest.repos.listPullRequestsAssociatedWithCommit, {
-                  owner,
-                  repo,
-                  commit_sha: reportHeadSha,
-                  per_page: 100,
-                });
-                for (const pullRequest of pullRequestsForCommit) {
-                  associatedPullRequests.set(pullRequest.number, pullRequest);
-                }
-              }
-
-              if (Number.isInteger(artifactPrNumber) && associatedPullRequests.has(artifactPrNumber)) {
-                issue_number = artifactPrNumber;
-              } else if (Number.isInteger(artifactPrNumber) && associatedPullRequests.size === 0) {
-                issue_number = artifactPrNumber;
-              } else if (!Number.isInteger(artifactPrNumber) && associatedPullRequests.size === 1) {
-                issue_number = [...associatedPullRequests.keys()][0];
-              } else if (Number.isInteger(artifactPrNumber)) {
-                core.setFailed(`The artifact pull request number (${artifactPrNumber}) is not associated with ${reportHeadSha}.`);
-                return;
-              } else {
-                core.setFailed(`Could not determine the pull request associated with ${reportHeadSha}.`);
-                return;
-              }
-            } else {
-              core.setFailed('Could not determine the pull request event for this report.');
-              return;
-            }
-
-            const currentPullRequest = await github.rest.pulls.get({
-              owner,
-              repo,
-              pull_number: issue_number,
-            });
-            const currentHeadSha = currentPullRequest.data.head?.sha;
-            if (reportHeadSha != null && currentHeadSha != null && reportHeadSha !== currentHeadSha) {
-              core.info(`The report head SHA (${reportHeadSha}) is not the current pull request head SHA (${currentHeadSha}). Skipping stale frontend bundle report.`);
-              return;
-            }
-
-            const jsSizeReport = fs.readFileSync(jsSizeReportPath, 'utf8').trim();
-            if (!jsSizeReport.includes(jsSizeMarker)) {
-              core.setFailed('The frontend JS size report is missing the expected marker.');
-              return;
-            }
-            let body = `${jsSizeReport}\n`;
-
-            const maxCommentLength = 65_000;
-            if (body.length > maxCommentLength) {
-              const reportLocation = workflowRun?.html_url != null
-                ? `[workflow run](${workflowRun.html_url})`
-                : 'workflow artifact';
-              const footer = [
-                '',
-                '',
-                `_Report truncated because it exceeded ${maxCommentLength.toLocaleString('en-US')} characters. See the ${reportLocation} for the full report._`,
-              ].join('\n');
-              body = `${body.slice(0, maxCommentLength - footer.length)}${footer}`;
-            }
-
-            const comments = await github.paginate(github.rest.issues.listComments, {
-              owner,
-              repo,
-              issue_number,
-              per_page: 100,
-            });
-            const previousReports = comments.filter((comment) =>
-              comment.user?.type === 'Bot' && reportMarkers.some((reportMarker) => comment.body?.includes(reportMarker)));
-
-            if (previousReports.length > 0) {
-              const [previous, ...duplicates] = previousReports;
-              await github.rest.issues.updateComment({
-                owner,
-                repo,
-                comment_id: previous.id,
-                body,
-              });
-              for (const duplicate of duplicates) {
-                await github.rest.issues.deleteComment({
-                  owner,
-                  repo,
-                  comment_id: duplicate.id,
-                });
-              }
-            } else {
-              await github.rest.issues.createComment({
-                owner,
-                repo,
-                issue_number,
-                body,
-              });
-            }

.github/workflows/frontend-bundle-report.yml

@@ -1,170 +0,0 @@
-name: frontend-bundle-report
-
-on:
-  pull_request:
-    types:
-      - opened
-      - synchronize
-      - reopened
-      - ready_for_review
-    paths:
-      - packages/frontend/**
-      - packages/frontend-shared/**
-      - packages/frontend-builder/**
-      - packages/i18n/**
-      - packages/icons-subsetter/**
-      - packages/misskey-js/**
-      - packages/misskey-reversi/**
-      - packages/misskey-bubble-game/**
-      - package.json
-      - pnpm-lock.yaml
-      - pnpm-workspace.yaml
-      - .node-version
-      - .github/scripts/utility.mts
-      - .github/scripts/frontend-js-size.mts
-      - .github/workflows/frontend-bundle-report.yml
-      - .github/workflows/frontend-bundle-report-comment.yml
-
-permissions:
-  contents: read
-  pull-requests: read
-
-concurrency:
-  group: frontend-bundle-report-${{ github.event.pull_request.number }}
-  cancel-in-progress: true
-
-jobs:
-  report:
-    name: Build frontend bundle report
-    runs-on: ubuntu-latest
-    env:
-      FRONTEND_JS_SIZE_LOCALE: ja-JP
-    steps:
-      - name: Checkout base
-        uses: actions/checkout@v6.0.3
-        with:
-          repository: ${{ github.event.pull_request.base.repo.full_name }}
-          ref: ${{ github.event.pull_request.base.sha }}
-          path: before
-          submodules: true
-
-      - name: Checkout pull request
-        uses: actions/checkout@v6.0.3
-        with:
-          repository: ${{ github.event.pull_request.head.repo.full_name }}
-          ref: ${{ github.event.pull_request.head.sha }}
-          path: after
-          submodules: true
-
-      - name: Check base visualizer support
-        id: check-base-visualizer
-        shell: bash
-        run: |
-          if grep -q 'FRONTEND_BUNDLE_VISUALIZER' before/packages/frontend/vite.config.ts; then
-            echo 'supported=true' >> "$GITHUB_OUTPUT"
-          else
-            echo 'supported=false' >> "$GITHUB_OUTPUT"
-            echo 'Base commit does not support frontend bundle visualizer. Skipping frontend bundle report.' >> "$GITHUB_STEP_SUMMARY"
-          fi
-
-      - name: Setup pnpm
-        if: steps.check-base-visualizer.outputs.supported == 'true'
-        uses: pnpm/action-setup@v6.0.9
-        with:
-          package_json_file: after/package.json
-
-      - name: Setup Node.js
-        if: steps.check-base-visualizer.outputs.supported == 'true'
-        uses: actions/setup-node@v6.4.0
-        with:
-          node-version-file: after/.node-version
-          cache: pnpm
-          cache-dependency-path: |
-            before/pnpm-lock.yaml
-            after/pnpm-lock.yaml
-
-      - name: Install dependencies for base
-        if: steps.check-base-visualizer.outputs.supported == 'true'
-        working-directory: before
-        run: pnpm i --frozen-lockfile
-
-      - name: Build frontend dependencies for base
-        if: steps.check-base-visualizer.outputs.supported == 'true'
-        working-directory: before
-        run: pnpm --filter "frontend^..." run build
-
-      - name: Prepare report output
-        if: steps.check-base-visualizer.outputs.supported == 'true'
-        run: mkdir -p "$RUNNER_TEMP/frontend-bundle-report"
-
-      - name: Build frontend report for base
-        if: steps.check-base-visualizer.outputs.supported == 'true'
-        working-directory: before
-        env:
-          FRONTEND_BUNDLE_VISUALIZER: 'true'
-          FRONTEND_BUNDLE_VISUALIZER_FILE: ${{ runner.temp }}/frontend-bundle-report/before-stats.json
-        run: pnpm --filter frontend run build
-
-      - name: Install dependencies for pull request
-        if: steps.check-base-visualizer.outputs.supported == 'true'
-        working-directory: after
-        run: pnpm i --frozen-lockfile
-
-      - name: Build frontend dependencies for pull request
-        if: steps.check-base-visualizer.outputs.supported == 'true'
-        working-directory: after
-        run: pnpm --filter "frontend^..." run build
-
-      - name: Build frontend report for pull request
-        if: steps.check-base-visualizer.outputs.supported == 'true'
-        working-directory: after
-        env:
-          FRONTEND_BUNDLE_VISUALIZER: 'true'
-          FRONTEND_BUNDLE_VISUALIZER_FILE: ${{ runner.temp }}/frontend-bundle-report/after-stats.json
-          FRONTEND_BUNDLE_VISUALIZER_HTML_FILE: ${{ runner.temp }}/frontend-bundle-report/frontend-bundle-visualizer.html
-        run: pnpm --filter frontend run build
-
-      - name: Upload bundle visualizer
-        if: steps.check-base-visualizer.outputs.supported == 'true'
-        id: upload-bundle-visualizer
-        uses: actions/upload-artifact@v7
-        with:
-          name: frontend-bundle-visualizer
-          path: ${{ runner.temp }}/frontend-bundle-report/frontend-bundle-visualizer.html
-          if-no-files-found: error
-          archive: false
-          retention-days: 7
-
-      - name: Generate report markdown
-        if: steps.check-base-visualizer.outputs.supported == 'true'
-        shell: bash
-        env:
-          BASE_SHA: ${{ github.event.pull_request.base.sha }}
-          HEAD_SHA: ${{ github.event.pull_request.head.sha }}
-          PR_NUMBER: ${{ github.event.pull_request.number }}
-          FRONTEND_BUNDLE_REPORT_ARTIFACT_URL: ${{ steps.upload-bundle-visualizer.outputs.artifact-url }}
-        run: |
-          REPORT_DIR="$RUNNER_TEMP/frontend-bundle-report"
-          node after/.github/scripts/frontend-js-size.mts before after "$REPORT_DIR/before-stats.json" "$REPORT_DIR/after-stats.json" "$REPORT_DIR/frontend-js-size-report.md"
-          printf '%s\n' "$PR_NUMBER" > "$REPORT_DIR/pr-number.txt"
-          printf '%s\n' "$BASE_SHA" > "$REPORT_DIR/base-sha.txt"
-          printf '%s\n' "$HEAD_SHA" > "$REPORT_DIR/head-sha.txt"
-          printf '%s\n' "${{ github.event.pull_request.html_url }}" > "$REPORT_DIR/pr-url.txt"
-
-      - name: Check report
-        if: steps.check-base-visualizer.outputs.supported == 'true'
-        run: |
-          REPORT_DIR="$RUNNER_TEMP/frontend-bundle-report"
-          test -s "$REPORT_DIR/before-stats.json"
-          test -s "$REPORT_DIR/after-stats.json"
-          test -s "$REPORT_DIR/frontend-js-size-report.md"
-          cat "$REPORT_DIR/frontend-js-size-report.md" >> "$GITHUB_STEP_SUMMARY"
-
-      - name: Upload bundle report
-        if: steps.check-base-visualizer.outputs.supported == 'true'
-        uses: actions/upload-artifact@v7
-        with:
-          name: frontend-bundle-report
-          path: ${{ runner.temp }}/frontend-bundle-report/
-          if-no-files-found: error
-          retention-days: 7

.github/workflows/frontend-diagnostics.comment.yml

@@ -0,0 +1,75 @@
+name: Frontend diagnostics (comment)
+
+on:
+  workflow_run:
+    workflows:
+      - Frontend diagnostics (inspect)
+    types:
+      - completed
+
+permissions:
+  actions: read
+  contents: read
+  issues: write
+  pull-requests: write
+
+jobs:
+  comment:
+    name: Comment frontend diagnostics report
+    if: github.event.workflow_run.event == 'pull_request' && github.event.workflow_run.conclusion == 'success'
+    runs-on: ubuntu-latest
+    concurrency:
+      group: frontend-diagnostics-report-${{ github.event.workflow_run.id }}
+      cancel-in-progress: true
+    steps:
+      - name: Download frontend diagnostics report
+        uses: actions/download-artifact@v8
+        with:
+          name: frontend-diagnostics
+          path: ${{ runner.temp }}/frontend-diagnostics
+          github-token: ${{ github.token }}
+          repository: ${{ github.repository }}
+          run-id: ${{ github.event.workflow_run.id }}
+
+      - name: Resolve current pull request
+        id: resolve-pr
+        uses: actions/github-script@v9
+        env:
+          PR_NUMBER_FILE: ${{ runner.temp }}/frontend-diagnostics/pr-number.txt
+        with:
+          script: |
+            const fs = require('fs/promises');
+            const { owner, repo } = context.repo;
+            const workflowRun = context.payload.workflow_run;
+            const pullRequestNumberText = (await fs.readFile(process.env.PR_NUMBER_FILE, 'utf8')).trim();
+            if (!/^[1-9]\d*$/.test(pullRequestNumberText)) {
+              throw new Error('Invalid pull request number in frontend diagnostics artifact.');
+            }
+
+            const pullRequestNumber = Number(pullRequestNumberText);
+            if (!Number.isSafeInteger(pullRequestNumber)) {
+              throw new Error('Pull request number in frontend diagnostics artifact is not a safe integer.');
+            }
+
+            const { data: currentPullRequest } = await github.rest.pulls.get({
+              owner,
+              repo,
+              pull_number: pullRequestNumber,
+            });
+
+            if (currentPullRequest.state !== 'open' || currentPullRequest.head.sha !== workflowRun.head_sha) {
+              core.notice(`Skipping stale frontend diagnostics report for pull request #${pullRequestNumber}.`);
+              core.setOutput('is-current', 'false');
+              return;
+            }
+
+            core.setOutput('is-current', 'true');
+            core.setOutput('pr-number', String(pullRequestNumber));
+
+      - name: Comment on pull request
+        if: steps.resolve-pr.outputs.is-current == 'true'
+        uses: thollander/actions-comment-pull-request@v3
+        with:
+          pr-number: ${{ steps.resolve-pr.outputs.pr-number }}
+          comment-tag: frontend-diagnostics
+          file-path: ${{ runner.temp }}/frontend-diagnostics/frontend-diagnostics.md

.github/workflows/frontend-diagnostics.inspect.yml

@@ -0,0 +1,246 @@
+name: Frontend diagnostics (inspect)
+
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+      - ready_for_review
+    paths:
+      - packages/frontend/**
+      - packages/frontend-shared/**
+      - packages/frontend-builder/**
+      - packages/backend/**
+      - packages/i18n/**
+      - packages/icons-subsetter/**
+      - packages/misskey-js/**
+      - packages/misskey-reversi/**
+      - packages/misskey-bubble-game/**
+      - package.json
+      - pnpm-lock.yaml
+      - pnpm-workspace.yaml
+      - .node-version
+      - .github/misskey/test.yml
+      - packages-private/diagnostics-shared/**
+      - packages-private/diagnostics-frontend/**
+      - .github/workflows/frontend-diagnostics.inspect.yml
+      - .github/workflows/frontend-diagnostics.comment.yml
+
+permissions:
+  contents: read
+  pull-requests: read
+
+concurrency:
+  group: frontend-diagnostics-inspect-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
+jobs:
+  report:
+    name: Measure frontend diagnostics
+    runs-on: ubuntu-latest
+    timeout-minutes: 90
+
+    services:
+      postgres:
+        image: postgres:18
+        ports:
+          - 54312:5432
+        env:
+          POSTGRES_DB: test-misskey
+          POSTGRES_HOST_AUTH_METHOD: trust
+      redis:
+        image: redis:8
+        ports:
+          - 56312:6379
+
+    steps:
+      - name: Checkout base
+        uses: actions/checkout@v6.0.3
+        with:
+          persist-credentials: false
+          repository: ${{ github.event.pull_request.base.repo.full_name }}
+          ref: ${{ github.event.pull_request.base.sha }}
+          path: base
+          submodules: true
+
+      - name: Checkout head
+        uses: actions/checkout@v6.0.3
+        with:
+          persist-credentials: false
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
+          ref: ${{ github.event.pull_request.head.sha }}
+          path: head
+          submodules: true
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v6.0.9
+        with:
+          package_json_file: head/package.json
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v6.4.0
+        with:
+          node-version-file: head/.node-version
+          cache: pnpm
+          cache-dependency-path: |
+            base/pnpm-lock.yaml
+            head/pnpm-lock.yaml
+
+      - name: Prepare report output
+        shell: bash
+        run: mkdir -p "$RUNNER_TEMP/frontend-diagnostics"
+
+      - name: Install dependencies for base
+        working-directory: base
+        run: pnpm i --frozen-lockfile
+
+      - name: Configure base
+        working-directory: base
+        run: cp .github/misskey/test.yml .config
+
+      - name: Build base
+        working-directory: base
+        env:
+          FRONTEND_BUNDLE_VISUALIZER: 'true'
+          FRONTEND_BUNDLE_VISUALIZER_FILE: ${{ runner.temp }}/frontend-diagnostics/base-bundle-stats.json
+        run: pnpm build
+
+      - name: Install dependencies for head
+        working-directory: head
+        run: pnpm i --frozen-lockfile
+
+      - name: Configure head
+        working-directory: head
+        run: cp .github/misskey/test.yml .config
+
+      - name: Build head
+        working-directory: head
+        env:
+          FRONTEND_BUNDLE_VISUALIZER: 'true'
+          FRONTEND_BUNDLE_VISUALIZER_FILE: ${{ runner.temp }}/frontend-diagnostics/head-bundle-stats.json
+          FRONTEND_BUNDLE_VISUALIZER_HTML_FILE: ${{ runner.temp }}/frontend-diagnostics/frontend-bundle-visualizer.html
+        run: pnpm build
+
+      - name: Upload bundle visualizer
+        id: upload-bundle-visualizer
+        uses: actions/upload-artifact@v7
+        with:
+          name: frontend-bundle-visualizer
+          path: ${{ runner.temp }}/frontend-diagnostics/frontend-bundle-visualizer.html
+          if-no-files-found: error
+          archive: false
+          retention-days: 7
+
+      - name: Install Playwright browsers
+        working-directory: head/packages-private/diagnostics-frontend
+        run: pnpm exec playwright install --with-deps --no-shell chromium
+
+      - name: Measure frontend browser metrics
+        shell: bash
+        working-directory: head
+        env:
+          FRONTEND_BROWSER_METRICS_SAMPLE_COUNT: 5
+          MK_ENABLE_CROSS_ORIGIN_ISOLATION: "true"
+          # 計測ハーネスはhead側のものを両方に使うが、成果物はrunnerのworkspace直下に出す
+          FRONTEND_BROWSER_HEAP_SNAPSHOT_OUTPUT_DIR: ${{ github.workspace }}
+        run: |
+          REPORT_DIR="$RUNNER_TEMP/frontend-diagnostics"
+          pnpm --filter diagnostics-frontend run inspect-browser \
+            "$GITHUB_WORKSPACE/base" "$GITHUB_WORKSPACE/head" \
+            "$REPORT_DIR/base-browser.json" "$REPORT_DIR/head-browser.json"
+
+      - name: Upload browser base heap snapshot
+        id: upload-browser-base-heap-snapshot
+        uses: actions/upload-artifact@v7
+        with:
+          name: frontend-browser-base-heap-snapshot
+          path: base-heap-snapshot.heapsnapshot
+          archive: false
+          if-no-files-found: error
+          retention-days: 7
+
+      - name: Upload browser head heap snapshot
+        id: upload-browser-head-heap-snapshot
+        uses: actions/upload-artifact@v7
+        with:
+          name: frontend-browser-head-heap-snapshot
+          path: head-heap-snapshot.heapsnapshot
+          archive: false
+          if-no-files-found: error
+          retention-days: 7
+
+      - name: Generate browser detailed html
+        shell: bash
+        working-directory: head
+        run: |
+          REPORT_DIR="$RUNNER_TEMP/frontend-diagnostics"
+          test -s "$REPORT_DIR/base-browser.json"
+          test -s "$REPORT_DIR/head-browser.json"
+          pnpm --filter diagnostics-frontend run render-browser-html \
+            "$REPORT_DIR/base-browser.json" "$REPORT_DIR/head-browser.json" \
+            "$REPORT_DIR/frontend-browser-detailed-html.html"
+
+      - name: Upload browser detailed html
+        id: upload-browser-detailed-html
+        uses: actions/upload-artifact@v7
+        with:
+          name: frontend-browser-metrics-detailed-html
+          path: ${{ runner.temp }}/frontend-diagnostics/frontend-browser-detailed-html.html
+          if-no-files-found: error
+          archive: false
+          retention-days: 7
+
+      - name: Generate frontend diagnostics report
+        shell: bash
+        working-directory: head
+        env:
+          BASE_SHA: ${{ github.event.pull_request.base.sha }}
+          HEAD_SHA: ${{ github.event.pull_request.head.sha }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          FRONTEND_BUNDLE_REPORT_ARTIFACT_URL: ${{ steps.upload-bundle-visualizer.outputs.artifact-url }}
+          FRONTEND_BROWSER_BASE_HEAP_SNAPSHOT_ARTIFACT_URL: ${{ steps.upload-browser-base-heap-snapshot.outputs.artifact-url }}
+          FRONTEND_BROWSER_HEAD_HEAP_SNAPSHOT_ARTIFACT_URL: ${{ steps.upload-browser-head-heap-snapshot.outputs.artifact-url }}
+          FRONTEND_BROWSER_DETAILED_HTML_ARTIFACT_URL: ${{ steps.upload-browser-detailed-html.outputs.artifact-url }}
+        run: |
+          REPORT_DIR="$RUNNER_TEMP/frontend-diagnostics"
+          test -s "$REPORT_DIR/base-bundle-stats.json"
+          test -s "$REPORT_DIR/head-bundle-stats.json"
+          test -s "$REPORT_DIR/base-browser.json"
+          test -s "$REPORT_DIR/head-browser.json"
+          pnpm --filter diagnostics-frontend run render-md \
+            "$GITHUB_WORKSPACE/base" "$GITHUB_WORKSPACE/head" \
+            "$REPORT_DIR/base-bundle-stats.json" "$REPORT_DIR/head-bundle-stats.json" \
+            "$REPORT_DIR/base-browser.json" "$REPORT_DIR/head-browser.json" \
+            "$REPORT_DIR/frontend-diagnostics.md"
+          printf '%s\n' "$PR_NUMBER" > "$REPORT_DIR/pr-number.txt"
+          printf '%s\n' "$BASE_SHA" > "$REPORT_DIR/base-sha.txt"
+          printf '%s\n' "$HEAD_SHA" > "$REPORT_DIR/head-sha.txt"
+          printf '%s\n' "${{ github.event.pull_request.html_url }}" > "$REPORT_DIR/pr-url.txt"
+
+      - name: Check frontend diagnostics report
+        shell: bash
+        run: |
+          REPORT_DIR="$RUNNER_TEMP/frontend-diagnostics"
+          test -s "$REPORT_DIR/frontend-diagnostics.md"
+          test -s "$REPORT_DIR/frontend-browser-detailed-html.html"
+          test -s "$REPORT_DIR/pr-number.txt"
+          test -s "$REPORT_DIR/head-sha.txt"
+          cat "$REPORT_DIR/frontend-diagnostics.md" >> "$GITHUB_STEP_SUMMARY"
+
+      - name: Upload frontend diagnostics report
+        uses: actions/upload-artifact@v7
+        with:
+          name: frontend-diagnostics
+          path: |
+            ${{ runner.temp }}/frontend-diagnostics/base-bundle-stats.json
+            ${{ runner.temp }}/frontend-diagnostics/head-bundle-stats.json
+            ${{ runner.temp }}/frontend-diagnostics/base-browser.json
+            ${{ runner.temp }}/frontend-diagnostics/head-browser.json
+            ${{ runner.temp }}/frontend-diagnostics/frontend-diagnostics.md
+            ${{ runner.temp }}/frontend-diagnostics/pr-number.txt
+            ${{ runner.temp }}/frontend-diagnostics/base-sha.txt
+            ${{ runner.temp }}/frontend-diagnostics/head-sha.txt
+            ${{ runner.temp }}/frontend-diagnostics/pr-url.txt
+          if-no-files-found: error
+          retention-days: 7

.github/workflows/lint.yml

@@ -123,12 +123,12 @@ jobs:
     runs-on: ubuntu-latest
     continue-on-error: true
     steps:
-    - uses: actions/checkout@v6.0.2
+    - uses: actions/checkout@v6.0.3
       with:
         fetch-depth: 0
         submodules: true
     - name: Setup pnpm
-      uses: pnpm/action-setup@v6.0.3
+      uses: pnpm/action-setup@v6.0.9
     - uses: actions/setup-node@v6.4.0
       with:
         node-version-file: '.node-version'

.github/workflows/locale.yml

@@ -1,4 +1,4 @@
-name: Lint
+name: Locale
 
 on:
   push:

.github/workflows/packages-private.yml

@@ -0,0 +1,52 @@
+name: Lint and test packages-private
+
+on:
+  push:
+    branches:
+      - master
+      - develop
+    paths:
+      - packages-private/**
+      - packages/shared/eslint.config.js
+      - package.json
+      - pnpm-workspace.yaml
+      - pnpm-lock.yaml
+      - .github/workflows/packages-private.yml
+  pull_request:
+    paths:
+      - packages-private/**
+      - packages/shared/eslint.config.js
+      - package.json
+      - pnpm-workspace.yaml
+      - pnpm-lock.yaml
+      - .github/workflows/packages-private.yml
+
+permissions:
+  contents: read
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        workspace:
+          - diagnostics-shared
+          - diagnostics-backend
+          - diagnostics-frontend
+          - changelog-checker
+    steps:
+      - uses: actions/checkout@v6.0.3
+        with:
+          persist-credentials: false
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v6.0.9
+      - uses: actions/setup-node@v6.4.0
+        with:
+          node-version-file: '.node-version'
+          cache: 'pnpm'
+      - run: pnpm --filter ${{ matrix.workspace }}... install --frozen-lockfile
+      # lint = typecheck + eslint
+      - run: pnpm --filter ${{ matrix.workspace }} run lint
+      # 各パッケージは必ず test スクリプトを持たせる (無いと ERR_PNPM_RECURSIVE_RUN_NO_SCRIPT で落ちる)
+      - run: pnpm --filter ${{ matrix.workspace }} run test

.okteto/okteto-pipeline.yml

@@ -1,6 +0,0 @@
-build:
-  misskey:
-    args:
-      - NODE_ENV=development
-deploy:
-  - helm upgrade --install misskey chart --set image=${OKTETO_BUILD_MISSKEY_IMAGE} --set url="https://misskey-$(kubectl config view --minify -o jsonpath='{..namespace}').cloud.okteto.net" --set environment=development

CHANGELOG.md

@@ -29,22 +29,47 @@
   - Fix: 幅が狭い画面で動画の再生が困難な問題を修正
   - Fix: 一部の画像のみセンシティブなとき、ビューワー内で画像を切り替えるとセンシティブな画像がそのまま表示される問題を修正
   - Fix: 一部の画像をビューワーで読み込んだ際に正しく表示されない問題を修正
+- Enhance: タイムラインの読み込みパフォーマンスを改善
+- Enhance: タブがバックグラウンドの間は必要ない定期更新処理を停止するように
 - Fix: 「画像を新しいタブで開く」が機能しなくなっていた問題を修正
 - Fix: デバイスタイプをスマートフォンに固定している状態で画面幅が広いとき、画面左上のアイコンが表示されない問題を修正
 - Fix: チャットでIMEの変換を確定するEnterでメッセージが送信されてしまうことがある問題を修正
 - Fix: 自分へのメンションに対する色分けで、判定が大文字/小文字を区別していた問題を修正
 - Fix: いくつかのイベントリスナーが正しく解除されない問題を修正（メモリ使用量の改善）
+- Fix: 非ログイン時トップページをスクロール操作できないことがある問題を修正
+- Fix: ローカルユーザーへのホスト付きメンションが本文に含まれる指名ノートの作成時、投稿フォームにて、当該ユーザーが宛先に含まれていても正しく認識されない問題を修正
+- Fix: チャートの描画終了後にリソースが解放されない問題を修正
+- Fix: ドライブの「このファイルからノートを作成」やギャラリーの「ノートで共有」、誕生日ウィジェットからのノート作成において、通常投稿の下書きが表示される問題を修正
+- Fix: QRコードリーダーがページを離れても停止しない問題を修正
+- Fix: ノートの詳細表示で削除された引用元が表示されない問題を修正
 
 ### Server
-- Enhance: センシティブメディアの判定を外部サービス ([sensitive-detector](https://github.com/misskey-dev/sensitive-detector)) に分離し、`nsfwjs` / `@tensorflow/tfjs(-node)` の同梱と NSFW 判定モデルを廃止 (#16804)
+- Feat: OpenTelemetryサポート
+  - 詳細な設定はconfigファイルを参照してください。
+  - Sentryとの併用も可能です。Sentry併用時は、PostgreSQL Query と Redis command は Sentry で計装されます。
+  - 以下の自動計装をサポートしています。（計装対象にする項目は設定可能）
+    - PostgreSQL query
+    - Redis command
+    - 全ての受信HTTPリクエスト
+    - 全ての送信HTTPリクエスト
+    - ジョブキュー（エンキュー元のトレースを含む）
+- Feat: ログ基盤の刷新
+  - API内部エラーのログに構造化属性と正規化したエラー情報を付与し、認証情報を自動的に秘匿するように（従来形式の表示は維持）
+  - ログ全体の既定出力レベルとドメインごとの出力レベルを設定できるように
+  - バックエンドのログを1行JSON形式で出力できるように
+  - OpenTelemetryのTrace ContextをJSON形式のログへ関連付けられるように
+  - HTTPのAccess logをstatus class単位で出力できるように（開発時のリクエスト・レスポンス本文、OpenTelemetryのTrace Contextにも対応）
 - Enhance: Sentry バックエンドの自動計装を `sentryForBackend.disabledIntegrations` で個別に無効化できるように
-- Enhance: Node.js 22.23.0以降、24.17.0以降、26.4.0以降をサポートするように
+- Enhance: センシティブメディアの判定を外部サービス ([sensitive-detector](https://github.com/misskey-dev/sensitive-detector)) に分離し、`nsfwjs` / `@tensorflow/tfjs(-node)` の同梱と NSFW 判定モデルを廃止 (#16804)
+- Enhance: Node.js 22.22.2以降、24.17.0以降、26.4.0以降をサポートするように
 - Enhance: Docker Image の Node.js を 26.4.0 に、Debian を trixie (v13) に更新
 - Enhance: URLプレビューの結果を内部でキャッシュするように
 - Fix: `/stats` API のレスポンス型が正しくない問題を修正
 - Fix: ハッシュタグに関連するデータを更新する際のエラーハンドリングを修正
 - Fix: Sentry 使用環境下にて、Misskey が発行した SQL クエリが span に含まれない問題を修正
 - Fix: Sentry 使用環境下にて、外部送信リクエストへ `sentry-trace` / `baggage` ヘッダーが既定で付与されないように
+- Fix: フォロワー限定投稿へのリプライをホーム投稿に出来る問題を修正
+- Fix: ファイルをアップロードするAPIにて、処理終了後に一時ファイルが削除されないことがある問題を修正
 
 ## 2026.6.0
 

chart/Chart.yaml

@@ -1,4 +0,0 @@
-apiVersion: v2
-name: misskey
-version: 0.0.0
-description: This chart is created for the purpose of previewing Pull Requests. Do not use this for production use.

chart/files/default.yml

@@ -1,232 +0,0 @@
-#━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
-# Misskey configuration
-#━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
-
-#   ┌─────┐
-#───┘ URL └─────────────────────────────────────────────────────
-
-# Final accessible URL seen by a user.
-# url: https://example.tld/
-
-# ONCE YOU HAVE STARTED THE INSTANCE, DO NOT CHANGE THE
-# URL SETTINGS AFTER THAT!
-
-#   ┌───────────────────────┐
-#───┘ Port and TLS settings └───────────────────────────────────
-
-#
-# Misskey supports two deployment options for public.
-#
-
-# Option 1: With Reverse Proxy
-#
-#                 +----- https://example.tld/ ------------+
-#   +------+      |+-------------+      +----------------+|
-#   | User | ---> || Proxy (443) | ---> | Misskey (3000) ||
-#   +------+      |+-------------+      +----------------+|
-#                 +---------------------------------------+
-#
-#   You need to setup reverse proxy. (eg. nginx)
-#   You do not define 'https' section.
-
-# Option 2: Standalone
-#
-#                 +- https://example.tld/ -+
-#   +------+      |   +---------------+    |
-#   | User | ---> |   | Misskey (443) |    |
-#   +------+      |   +---------------+    |
-#                 +------------------------+
-#
-#   You need to run Misskey as root.
-#   You need to set Certificate in 'https' section.
-
-# To use option 1, uncomment below line.
-port: 3000 # A port that your Misskey server should listen.
-
-# To use option 2, uncomment below lines.
-#port: 443
-
-#https:
-#  # path for certification
-#  key: /etc/letsencrypt/live/example.tld/privkey.pem
-#  cert: /etc/letsencrypt/live/example.tld/fullchain.pem
-
-#   ┌──────────────────────────┐
-#───┘ PostgreSQL configuration └────────────────────────────────
-
-db:
-  host: localhost
-  port: 5432
-
-  # Database name
-  db: misskey
-
-  # Auth
-  user: example-misskey-user
-  pass: example-misskey-pass
-
-  # Whether disable Caching queries
-  #disableCache: true
-
-  # Extra Connection options
-  #extra:
-  #  ssl: true
-
-dbReplications: false
-
-# You can configure any number of replicas here
-#dbSlaves:
-#  -
-#    host:
-#    port:
-#    db:
-#    user:
-#    pass:
-#  -
-#    host:
-#    port:
-#    db:
-#    user:
-#    pass:
-
-#   ┌─────────────────────┐
-#───┘ Redis configuration └─────────────────────────────────────
-
-redis:
-  host: localhost
-  port: 6379
-  #family: 0  # 0=Both, 4=IPv4, 6=IPv6
-  #pass: example-pass
-  #prefix: example-prefix
-  #db: 1
-
-#redisForPubsub:
-#  host: localhost
-#  port: 6379
-#  #family: 0  # 0=Both, 4=IPv4, 6=IPv6
-#  #pass: example-pass
-#  #prefix: example-prefix
-#  #db: 1
-
-#redisForJobQueue:
-#  host: localhost
-#  port: 6379
-#  #family: 0  # 0=Both, 4=IPv4, 6=IPv6
-#  #pass: example-pass
-#  #prefix: example-prefix
-#  #db: 1
-
-#redisForTimelines:
-#  host: redis
-#  port: 6379
-#  #family: 0  # 0=Both, 4=IPv4, 6=IPv6
-#  #pass: example-pass
-#  #prefix: example-prefix
-#  #db: 1
-
-#redisForReactions:
-#  host: redis
-#  port: 6379
-#  #family: 0  # 0=Both, 4=IPv4, 6=IPv6
-#  #pass: example-pass
-#  #prefix: example-prefix
-#  #db: 1
-
-#   ┌───────────────────────────┐
-#───┘ MeiliSearch configuration └─────────────────────────────
-
-#meilisearch:
-#  host: localhost
-#  port: 7700
-#  apiKey: ''
-#  ssl: true
-#  index: ''
-
-#   ┌───────────────┐
-#───┘ ID generation └───────────────────────────────────────────
-
-# You can select the ID generation method.
-# You don't usually need to change this setting, but you can
-# change it according to your preferences.
-
-# Available methods:
-# aid ... Short, Millisecond accuracy
-# aidx ... Millisecond accuracy
-# meid ... Similar to ObjectID, Millisecond accuracy
-# ulid ... Millisecond accuracy
-# objectid ... This is left for backward compatibility
-
-# ONCE YOU HAVE STARTED THE INSTANCE, DO NOT CHANGE THE
-# ID SETTINGS AFTER THAT!
-
-id: "aidx"
-
-#   ┌────────────────┐
-#───┘ Error tracking └──────────────────────────────────────────
-
-# Sentry is available for error tracking.
-# See the Sentry documentation for more details on options.
-
-#sentryForBackend:
-#  enableNodeProfiling: true
-#  options:
-#    dsn: 'https://examplePublicKey@o0.ingest.sentry.io/0'
-
-#sentryForFrontend:
-#  vueIntegration:
-#    tracingOptions:
-#      trackComponents: true
-#  browserTracingIntegration:
-#  replayIntegration:
-#  options:
-#    dsn: 'https://examplePublicKey@o0.ingest.sentry.io/0'
-
-#   ┌─────────────────────┐
-#───┘ Other configuration └─────────────────────────────────────
-
-# Whether disable HSTS
-#disableHsts: true
-
-# Number of worker processes
-#clusterLimit: 1
-
-# Number of threads of extra thread pool for CPU-intensive tasks (per worker)
-#threadPoolSize: 1
-
-# Job concurrency per worker
-# deliverJobConcurrency: 128
-# inboxJobConcurrency: 16
-
-# Job rate limiter
-# deliverJobPerSec: 128
-# inboxJobPerSec: 32
-
-# Job attempts
-# deliverJobMaxAttempts: 12
-# inboxJobMaxAttempts: 8
-
-# IP address family used for outgoing request (ipv4, ipv6 or dual)
-#outgoingAddressFamily: ipv4
-
-# Proxy for HTTP/HTTPS
-#proxy: http://127.0.0.1:3128
-
-#proxyBypassHosts: [
-#  'example.com',
-#  '192.0.2.8'
-#]
-
-# Proxy for SMTP/SMTPS
-#proxySmtp: http://127.0.0.1:3128   # use HTTP/1.1 CONNECT
-#proxySmtp: socks4://127.0.0.1:1080 # use SOCKS4
-#proxySmtp: socks5://127.0.0.1:1080 # use SOCKS5
-
-# Media Proxy
-#mediaProxy: https://example.com/proxy
-
-#allowedPrivateNetworks: [
-#  '127.0.0.1/32'
-#]
-
-# Upload or download file size limits (bytes)
-#maxFileSize: 262144000

chart/templates/ConfigMap.yml

@@ -1,8 +0,0 @@
-apiVersion: v1
-kind: ConfigMap
-metadata:
-  name: {{ include "misskey.fullname" . }}-configuration
-data:
-  default.yml: |-
-    {{ .Files.Get "files/default.yml"|nindent 4 }}
-    url: {{ .Values.url }}

chart/templates/Deployment.yml

@@ -1,47 +0,0 @@
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  name: {{ include "misskey.fullname" . }}
-  labels:
-    {{- include "misskey.labels" . | nindent 4 }}
-spec:
-  selector:
-    matchLabels:
-      {{- include "misskey.selectorLabels" . | nindent 6 }}
-  replicas: 1
-  template:
-    metadata:
-      labels:
-        {{- include "misskey.selectorLabels" . | nindent 8 }}
-    spec:
-      containers:
-        - name: misskey
-          image: {{ .Values.image }}
-          env:
-            - name: NODE_ENV
-              value: {{ .Values.environment }}
-          volumeMounts:
-            - name: {{ include "misskey.fullname" . }}-configuration
-              mountPath: /misskey/.config
-              readOnly: true
-          ports:
-            - containerPort: 3000
-        - name: postgres
-          image: postgres:18-alpine
-          env:
-            - name: POSTGRES_USER
-              value: "example-misskey-user"
-            - name: POSTGRES_PASSWORD
-              value: "example-misskey-pass"
-            - name: POSTGRES_DB
-              value: "misskey"
-          ports:
-            - containerPort: 5432
-        - name: redis
-          image: redis:7-alpine
-          ports:
-            - containerPort: 6379
-      volumes:
-        - name: {{ include "misskey.fullname" . }}-configuration
-          configMap:
-            name: {{ include "misskey.fullname" . }}-configuration

chart/templates/Service.yml

@@ -1,14 +0,0 @@
-apiVersion: v1
-kind: Service
-metadata:
-  name: {{ include "misskey.fullname" . }}
-  annotations:
-    dev.okteto.com/auto-ingress: "true"
-spec:
-  type: ClusterIP
-  ports:
-    - port: 3000
-      protocol: TCP
-      name: http
-  selector:
-    {{- include "misskey.selectorLabels" . | nindent 4 }}

chart/templates/_helpers.tpl

@@ -1,62 +0,0 @@
-{{/*
-Expand the name of the chart.
-*/}}
-{{- define "misskey.name" -}}
-{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }}
-{{- end }}
-
-{{/*
-Create a default fully qualified app name.
-We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
-If release name contains chart name it will be used as a full name.
-*/}}
-{{- define "misskey.fullname" -}}
-{{- if .Values.fullnameOverride }}
-{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" }}
-{{- else }}
-{{- $name := default .Chart.Name .Values.nameOverride }}
-{{- if contains $name .Release.Name }}
-{{- .Release.Name | trunc 63 | trimSuffix "-" }}
-{{- else }}
-{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" }}
-{{- end }}
-{{- end }}
-{{- end }}
-
-{{/*
-Create chart name and version as used by the chart label.
-*/}}
-{{- define "misskey.chart" -}}
-{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
-{{- end }}
-
-{{/*
-Common labels
-*/}}
-{{- define "misskey.labels" -}}
-helm.sh/chart: {{ include "misskey.chart" . }}
-{{ include "misskey.selectorLabels" . }}
-{{- if .Chart.AppVersion }}
-app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
-{{- end }}
-app.kubernetes.io/managed-by: {{ .Release.Service }}
-{{- end }}
-
-{{/*
-Selector labels
-*/}}
-{{- define "misskey.selectorLabels" -}}
-app.kubernetes.io/name: {{ include "misskey.name" . }}
-app.kubernetes.io/instance: {{ .Release.Name }}
-{{- end }}
-
-{{/*
-Create the name of the service account to use
-*/}}
-{{- define "misskey.serviceAccountName" -}}
-{{- if .Values.serviceAccount.create }}
-{{- default (include "misskey.fullname" .) .Values.serviceAccount.name }}
-{{- else }}
-{{- default "default" .Values.serviceAccount.name }}
-{{- end }}
-{{- end }}

chart/values.yml

@@ -1,3 +0,0 @@
-url: https://example.tld/
-image: okteto.dev/misskey
-environment: production

locales/ca-ES.yml

@@ -1361,14 +1361,11 @@ information: "Informació"
 chat: "Xat"
 directMessage: "Xateja amb aquest usuari"
 directMessage_short: "Missatge"
-migrateOldSettings: "Migrar la configuració anterior"
-migrateOldSettings_description: "Normalment això es fa automàticament, però si la transició no es fa, el procés es pot iniciar manualment. S'esborrarà la configuració actual."
 compress: "Comprimir "
 right: "Dreta"
 bottom: "A baix "
 top: "A dalt "
 embed: "Incrustar"
-settingsMigrating: "Estem migrant la teva configuració. Si us plau espera un moment... (També pots fer la migració més tard, manualment, anant a Preferències → Altres → Migrar configuració antiga)"
 readonly: "Només lectura"
 goToDeck: "Tornar al tauler"
 federationJobs: "Treballs de federació"

locales/de-DE.yml

@@ -1358,14 +1358,11 @@ information: "Über"
 chat: "Chat"
 directMessage: "Mit dem Benutzer chatten"
 directMessage_short: "Nachrichten"
-migrateOldSettings: "Alte Client-Einstellungen migrieren"
-migrateOldSettings_description: "Dies sollte normalerweise automatisch geschehen, aber wenn die Migration aus irgendeinem Grund nicht erfolgreich war, kannst du den Migrationsprozess selbst manuell auslösen. Die aktuellen Konfigurationsinformationen werden dabei überschrieben."
 compress: "Komprimieren"
 right: "Rechts"
 bottom: "Unten"
 top: "Oben"
 embed: "Einbetten"
-settingsMigrating: "Deine Einstellungen werden gerade migriert. Bitte warte einen Moment... (Du kannst die Einstellungen später auch manuell migrieren, indem du zu Einstellungen → Anderes → Alte Einstellungen migrieren gehst)"
 readonly: "Nur Lesezugriff"
 goToDeck: "Zurück zum Deck"
 federationJobs: "Föderation Jobs"

locales/en-US.yml

@@ -1361,14 +1361,11 @@ information: "About"
 chat: "Chat"
 directMessage: "Chat with user"
 directMessage_short: "Message"
-migrateOldSettings: "Migrate old client settings"
-migrateOldSettings_description: "This should be done automatically but if for some reason the migration was not successful, you can trigger the migration process yourself manually. The current configuration information will be overwritten."
 compress: "Compress"
 right: "Right"
 bottom: "Bottom"
 top: "Top"
 embed: "Embed"
-settingsMigrating: "Settings are being migrated, please wait a moment... (You can also migrate manually later by going to Settings→Others→Migrate old settings)"
 readonly: "Read only"
 goToDeck: "Return to Deck"
 federationJobs: "Federation Jobs"

locales/es-ES.yml

@@ -584,7 +584,7 @@ showFixedPostForm: "Mostrar formulario de publicación sobre la línea de tiempo
 showFixedPostFormInChannel: "Mostrar el formulario de publicación por encima de la cronología (Canales)"
 withRepliesByDefaultForNewlyFollowed: "Incluir por defecto respuestas de usuarios recién seguidos en la línea de tiempo"
 newNoteRecived: "Tienes una nota nueva"
-newNote: "Nueva nota"
+newNote: "Nuevas notas"
 sounds: "Sonidos"
 sound: "Sonidos"
 notificationSoundSettings: "Configuración del sonido de las notificaciones"
@@ -1219,7 +1219,7 @@ keepScreenOn: "Mantener pantalla encendida"
 verifiedLink: "Propiedad del enlace verificada"
 notifyNotes: "Notificar nuevas notas"
 unnotifyNotes: "Dejar de notificar nuevas notas"
-notifyUsers: "Usuarios que han activado las notificaciones de publicaciones"
+notifyUsers: "Cuentas con notificaciones activadas"
 authentication: "Autenticación"
 authenticationRequiredToContinue: "Por favor, autentifícate para continuar"
 dateAndTime: "Fecha y hora"
@@ -1361,14 +1361,11 @@ information: "Información"
 chat: "Chat"
 directMessage: "Chatear"
 directMessage_short: "Mensajes"
-migrateOldSettings: "Migrar la configuración anterior"
-migrateOldSettings_description: "Esto debería hacerse automáticamente, pero si por alguna razón la migración no ha tenido éxito, puede activar usted mismo el proceso de migración manualmente. Se sobrescribirá la información de configuración actual."
 compress: "Compresión de la imagen"
 right: "Derecha"
 bottom: "Abajo"
 top: "Arriba"
 embed: "Insertar"
-settingsMigrating: "La configuración está siendo migrada, por favor espera un momento... (También puedes migrar manualmente más tarde yendo a Ajustes  otros migrar configuración antigua"
 readonly: "Solo Lectura"
 goToDeck: "Volver al Deck"
 federationJobs: "Trabajos de Federación"

locales/id-ID.yml

@@ -1358,6 +1358,7 @@ _chat:
   invitations: "Undang"
   history: "Riwayat obrolan"
   noHistory: "Tidak ada riwayat"
+  join: "Gabung"
   members: "Anggota"
   home: "Beranda"
   send: "Kirim"
@@ -2555,6 +2556,8 @@ _deck:
   useSimpleUiForNonRootPages: "Gunakan antarmuka sederhana ke halaman yang dituju"
   usedAsMinWidthWhenFlexible: "Lebar minimum akan digunakan untuk ini ketika opsi \"Atur-otomatis lebar\" dinyalakan"
   flexible: "Atur-otomatis lebar"
+  _howToUse:
+    settings_title: "Pengaturan UI"
   _columns:
     main: "Utama"
     widgets: "Widget"

locales/it-IT.yml

@@ -1361,14 +1361,11 @@ information: "Informazioni"
 chat: "Chat"
 directMessage: "Chattare insieme"
 directMessage_short: "Messaggio"
-migrateOldSettings: "Migrare le vecchie impostazioni"
-migrateOldSettings_description: "Di solito, viene fatto automaticamente. Se per qualche motivo non fossero migrate con successo, è possibile avviare il processo di migrazione manualmente, sovrascrivendo le configurazioni attuali."
 compress: "Compressione"
 right: "Destra"
 bottom: "Sotto"
 top: "Sopra"
 embed: "Incorporare"
-settingsMigrating: "Migrazione delle impostazioni. Attendere prego ... (Puoi anche migrare manualmente in un secondo momento, nel menu: Impostazioni → Altro → Migrazione delle impostazioni)"
 readonly: "Sola lettura"
 goToDeck: "Torna al Deck"
 federationJobs: "Coda di federazione"

locales/ja-KS.yml

@@ -1332,9 +1332,6 @@ preferenceSyncConflictChoiceCancel: "同期の有効化はやめとくわ"
 postForm: "投稿フォーム"
 information: "情報"
 directMessage: "チャットしよか"
-migrateOldSettings: "旧設定情報をお引っ越し"
-migrateOldSettings_description: "通常これは自動で行われるはずなんやけど、なんかの理由で上手く移行できへんかったときは手動で移行処理をポチっとできるで。今の設定情報は上書きされるで。"
-settingsMigrating: "設定を移行しとるで。ちょっと待っとってな... (後で、設定→その他→旧設定情報を移行 で手動で移行することもできるで)"
 driveAboutTip: "ドライブでは、今までアップロードしたファイルがずらーっと表示されるで。<br>\nノートにファイルをもっかいのっけたり、あとで投稿するファイルをその辺に置いとくこともできるねん。<br>\n<b>ファイルをほかすと、前にそのファイルをのっけた全部の場所(ノート、ページ、アバター、バナー等)からも見えんくなるから気いつけてな。</b><br>\nフォルダを作って整理することもできるで。"
 turnItOn: "オンにしとこ"
 turnItOff: "オフでええわ"

locales/ko-KR.yml

@@ -1361,14 +1361,11 @@ information: "정보"
 chat: "채팅"
 directMessage: "채팅하기"
 directMessage_short: "메시지"
-migrateOldSettings: "기존 설정 정보를 이전"
-migrateOldSettings_description: "보통은 자동으로 이루어지지만, 어떤 이유로 인해 성공적으로 이전이 이루어지지 않는 경우 수동으로 이전을 실행할 수 있습니다. 현재 설정 정보는 덮어쓰게 됩니다."
 compress: "압축"
 right: "오른쪽"
 bottom: "아래"
 top: "위"
 embed: "임베드"
-settingsMigrating: "설정을 이전하는 중입니다. 잠시 기다려주십시오... (나중에 '환경설정 → 기타 → 기존 설정 정보를 이전'에서 수동으로 이전할 수도 있습니다)"
 readonly: "읽기 전용"
 goToDeck: "덱으로 돌아가기"
 federationJobs: "연합 작업"

locales/pt-PT.yml

@@ -1347,14 +1347,11 @@ information: "Sobre"
 chat: "Conversas"
 directMessage: "Conversar com usuário"
 directMessage_short: "Mensagem"
-migrateOldSettings: "Migrar configurações antigas de cliente"
-migrateOldSettings_description: "Isso deve ser feito automaticamente. Caso o processo de migração tenha falhado, você pode acioná-lo manualmente. As informações atuais de migração serão substituídas."
 compress: "Comprimir"
 right: "Direita"
 bottom: "Inferior"
 top: "Superior"
 embed: "Embed"
-settingsMigrating: "Configurações estão sendo migradas, aguarde... (Você pode migrar manualmente em Configurações→Outros→Migrar configurações antigas de cliente)"
 readonly: "Ler apenas"
 goToDeck: "Voltar ao Deck"
 federationJobs: "Tarefas de Federação"

locales/th-TH.yml

@@ -1358,14 +1358,11 @@ information: "เกี่ยวกับ"
 chat: "แชต"
 directMessage: "แชตเลย"
 directMessage_short: "ข้อความ"
-migrateOldSettings: "ย้ายข้อมูลการตั้งค่าเก่า"
-migrateOldSettings_description: "โดยปกติจะทำโดยอัตโนมัติ แต่หากด้วยเหตุผลบางประการที่ไม่สามารถย้ายได้สำเร็จ สามารถสั่งย้ายด้วยตนเองได้ การตั้งค่าปัจจุบันจะถูกเขียนทับ"
 compress: "บีบอัด"
 right: "ขวา"
 bottom: "ล่าง"
 top: "บน"
 embed: "ฝัง"
-settingsMigrating: "กำลังย้ายการตั้งค่า กรุณารอสักครู่... (สามารถย้ายด้วยตนเองภายหลังได้ที่ การตั้งค่า → อื่นๆ → ย้ายข้อมูลการตั้งค่าเก่า)"
 readonly: "อ่านได้อย่างเดียว"
 goToDeck: "กลับไปยังเด็ค"
 federationJobs: "งานสหพันธ์"

locales/tl-PH.yml

@@ -0,0 +1 @@
+---

locales/tr-TR.yml

@@ -1358,14 +1358,11 @@ information: "Hakkında"
 chat: "Sohbet"
 directMessage: "Kullanıcıyla sohbet et"
 directMessage_short: "Mesaj"
-migrateOldSettings: "Eski istemci ayarlarını taşıma"
-migrateOldSettings_description: "Bu işlem otomatik olarak yapılmalıdır, ancak herhangi bir nedenle geçiş başarısız olursa, geçiş işlemini manuel olarak kendin başlatabilirsin. Mevcut yapılandırma bilgileri üzerine yazılacaktır."
 compress: "Sıkıştır"
 right: "Sağ"
 bottom: "Alt"
 top: "Üst"
 embed: "Göm"
-settingsMigrating: "Ayarlar taşınıyor, lütfen bir dakika bekle... (Daha sonra Ayarlar→Diğerler→Eski ayarları taşı seçeneğine giderek manuel olarak da taşıyabilirsin)"
 readonly: "Sadece okuma"
 goToDeck: "Güverteye Dön"
 federationJobs: "Federasyon İşleri"

locales/uk-UA.yml

@@ -1314,14 +1314,11 @@ information: "Інформація"
 chat: "Чат"
 directMessage: "Чат із користувачем"
 directMessage_short: "Повідомлення"
-migrateOldSettings: "Перенести минулі налаштування клієнта"
-migrateOldSettings_description: "Це має відбутися автоматично, але якщо з якоїсь причини перенесення не вдалося, ви можете запустити його вручну. Поточні дані конфігурації буде перезаписано."
 compress: "Стиснути"
 right: "Праворуч"
 bottom: "Зверху"
 top: "Знизу"
 embed: "Вбудувати"
-settingsMigrating: "Налаштування переносяться, зачекайте трохи... (Ви також можете перенести їх вручну пізніше: Налаштування → Інше → Перенести старі налаштування)"
 readonly: "Лише для читання"
 goToDeck: "Повернутися до Деки"
 federationJobs: "Завдання федерації"

locales/vi-VN.yml

@@ -1219,8 +1219,6 @@ paste: "dán"
 postForm: "Mẫu đăng"
 information: "Giới thiệu"
 chat: "Trò chuyện"
-migrateOldSettings: "Di chuyển cài đặt cũ"
-migrateOldSettings_description: "Thông thường, quá trình này diễn ra tự động, nhưng nếu vì lý do nào đó mà quá trình di chuyển không thành công, bạn có thể kích hoạt thủ công quy trình di chuyển, quá trình này sẽ ghi đè lên thông tin cấu hình hiện tại của bạn."
 driveAboutTip: "Trong Drive, danh sách các tệp bạn đã tải lên trước đây sẽ được hiển thị.<br>\nBạn có thể sử dụng lại chúng khi đính kèm vào ghi chú, hoặc tải lên trước các tệp để đăng sau.<br>\n<b>Lưu ý rằng nếu bạn xóa một tệp, tệp đó cũng sẽ biến mất khỏi tất cả những nơi đã sử dụng tệp đó (ghi chú, trang, ảnh đại diện, biểu ngữ, v.v.).</b><br>\nBạn cũng có thể tạo các thư mục để sắp xếp chúng."
 inMinutes: "phút"
 inDays: "ngày"

locales/zh-CN.yml

@@ -1361,14 +1361,11 @@ information: "关于"
 chat: "聊天"
 directMessage: "私信"
 directMessage_short: "消息"
-migrateOldSettings: "迁移旧设置信息"
-migrateOldSettings_description: "通常设置信息将自动迁移。但如果由于某种原因迁移不成功，则可以手动触发迁移过程。当前的配置信息将被覆盖。"
 compress: "压缩"
 right: "右"
 bottom: "下"
 top: "上"
 embed: "嵌入"
-settingsMigrating: "正在迁移设置，请稍候。（之后也可以在设置 → 其它 → 迁移旧设置来手动迁移）"
 readonly: "只读"
 goToDeck: "返回至 Deck"
 federationJobs: "联邦作业"

locales/zh-TW.yml

@@ -1361,14 +1361,11 @@ information: "關於"
 chat: "聊天"
 directMessage: "直接訊息"
 directMessage_short: "訊息"
-migrateOldSettings: "遷移舊設定資訊"
-migrateOldSettings_description: "通常情況下，這會自動進行，但若因某些原因未能順利遷移，您可以手動觸發遷移處理。請注意，當前的設定資訊將會被覆寫。"
 compress: "壓縮"
 right: "右"
 bottom: "下"
 top: "上"
 embed: "嵌入"
-settingsMigrating: "正在移轉設定。請稍候……（之後也可以到「設定 → 其他 → 舊設定資訊移轉」中手動進行移轉）"
 readonly: "唯讀"
 goToDeck: "回到多欄模式"
 federationJobs: "聯邦通訊作業"

package.json

@@ -1,24 +1,26 @@
 {
 	"name": "misskey",
-	"version": "2026.7.0-alpha.3",
+	"version": "2026.7.0-beta.4",
 	"codename": "nasubi",
 	"repository": {
 		"type": "git",
 		"url": "https://github.com/misskey-dev/misskey.git"
 	},
-	"packageManager": "pnpm@11.9.0",
+	"packageManager": "pnpm@11.11.0",
 	"workspaces": [
-		"packages/misskey-js",
+		"packages/backend",
+		"packages/frontend-shared",
+		"packages/frontend",
+		"packages/frontend-builder",
+		"packages/frontend-embed",
 		"packages/i18n",
+		"packages/icons-subsetter",
+		"packages/sw",
+		"packages/misskey-js",
+		"packages/misskey-js/generator",
 		"packages/misskey-reversi",
 		"packages/misskey-bubble-game",
-		"packages/icons-subsetter",
-		"packages/frontend-shared",
-		"packages/frontend-builder",
-		"packages/sw",
-		"packages/backend",
-		"packages/frontend",
-		"packages/frontend-embed"
+		"packages-private/*"
 	],
 	"private": true,
 	"scripts": {
@@ -55,22 +57,22 @@
 		"esbuild": "0.28.1",
 		"execa": "9.6.1",
 		"ignore-walk": "9.0.0",
-		"js-yaml": "5.2.0",
-		"tar": "7.5.19"
+		"js-yaml": "5.2.1",
+		"tar": "7.5.20"
 	},
 	"devDependencies": {
-		"@eslint/js": "9.39.4",
+		"@eslint/js": "9.39.5",
 		"@misskey-dev/eslint-plugin": "2.1.0",
-		"@types/node": "26.0.1",
-		"@typescript-eslint/eslint-plugin": "8.62.0",
-		"@typescript-eslint/parser": "8.62.0",
-		"@typescript/native-preview": "7.0.0-dev.20260426.1",
+		"@types/node": "26.1.1",
+		"@typescript-eslint/eslint-plugin": "8.63.0",
+		"@typescript-eslint/parser": "8.63.0",
+		"@typescript/native": "npm:typescript@7.0.2",
 		"cross-env": "10.1.0",
-		"eslint": "9.39.4",
+		"eslint": "9.39.5",
 		"globals": "17.7.0",
 		"ncp": "2.0.0",
-		"pnpm": "11.9.0",
+		"pnpm": "11.11.0",
 		"start-server-and-test": "3.0.11",
-		"typescript": "5.9.3"
+		"typescript": "npm:@typescript/typescript6@6.0.2"
 	}
 }

packages-private/README.md

@@ -0,0 +1,32 @@
+# packages-private
+
+`packages-private` は、CIなどで使用するためのユーティリティなどを格納する場所です。この配下にあるものは**プロダクションの `/packages`**の依存となるものではありません。
+
+## パッケージ一覧
+
+| パッケージ | 用途 |
+| --- | --- |
+| [`diagnostics-shared`](./diagnostics-shared) | 計測系パッケージが共有する統計・書式整形・V8 heap snapshot解析のユーティリティ |
+| [`diagnostics-backend`](./diagnostics-backend) | バックエンドのメモリ使用量をbase/headで比較し、PRコメント用のMarkdownを生成する |
+| [`diagnostics-frontend`](./diagnostics-frontend) | フロントエンドをブラウザで起動した際のメトリクスと生成されたchunk情報等をbase/headで比較する |
+| [`changelog-checker`](./changelog-checker) | `CHANGELOG.md` の追記内容を検証する |
+
+## GitHub Actionsからの呼び出し方
+
+ワークフロー側にロジックを持たせず、各パッケージのnpm scriptを呼ぶだけにしている。
+CLIに渡すパスはすべて呼び出し側のカレントディレクトリ基準で解決されるため、
+ワークフローからは `$GITHUB_WORKSPACE` / `$RUNNER_TEMP` を使った絶対パスを渡すこと。
+
+```yaml
+- name: Generate report
+  working-directory: head
+  run: >-
+    pnpm --filter diagnostics-frontend run render-md
+    "$GITHUB_WORKSPACE/base" "$GITHUB_WORKSPACE/head"
+    "$REPORT_DIR/base-bundle-stats.json" "$REPORT_DIR/head-bundle-stats.json"
+    "$REPORT_DIR/base-browser.json" "$REPORT_DIR/head-browser.json"
+    "$REPORT_DIR/report.md"
+```
+
+base/head を比較する計測では、**head側のチェックアウトにあるハーネスで両方を計測する**
+(計測コードの差分ではなくビルド成果物の差分だけが結果に出るようにするため)。

packages-private/changelog-checker/eslint.config.js

@@ -1,10 +1,16 @@
 import tsParser from '@typescript-eslint/parser';
 import sharedConfig from '../../packages/shared/eslint.config.js';
 
+// eslint-disable-next-line import/no-default-export
 export default [
 	...sharedConfig,
 	{
-		files: ['src/**/*.ts', 'src/**/*.tsx'],
+		ignores: [
+			'**/node_modules',
+		],
+	},
+	{
+		files: ['**/*.ts', '**/*.tsx'],
 		languageOptions: {
 			parserOptions: {
 				parser: tsParser,

packages-private/changelog-checker/package.json

@@ -0,0 +1,24 @@
+{
+	"name": "changelog-checker",
+	"private": true,
+	"type": "module",
+	"scripts": {
+		"check": "tsx src/index.ts",
+		"eslint": "eslint './**/*.{js,jsx,ts,tsx}'",
+		"lint": "pnpm typecheck && pnpm eslint",
+		"test": "vitest run",
+		"test:coverage": "vitest run --coverage",
+		"typecheck": "tsc --noEmit"
+	},
+  "devDependencies": {
+    "@types/mdast": "4.0.4",
+    "@types/node": "26.1.1",
+    "@vitest/coverage-v8": "4.1.10",
+    "mdast-util-to-string": "4.0.0",
+    "remark": "15.0.1",
+    "remark-parse": "11.0.0",
+		"tsx": "4.23.1",
+    "unified": "11.0.5",
+    "vitest": "4.1.10"
+  }
+}

packages-private/changelog-checker/src/checker.ts

@@ -33,16 +33,22 @@ export function checkNewRelease(base: Release[], head: Release[]): Result {
 		return Result.ofFailed('Invalid release count.');
 	}
 
-	const baseLatest = base[0];
-	const headPrevious = head[releaseCountDiff];
-
-	if (baseLatest.releaseName !== headPrevious.releaseName) {
-		return Result.ofFailed('Contains unexpected releases.');
+	// 追加分を除いた残り (= base に既にあったリリース) が順序ごと一致することを確認する。
+	// 先頭だけ比較していると、より古いリリースが書き換えられていても素通りしてしまう
+	const existingReleases = head.slice(releaseCountDiff);
+	for (let relIdx = 0; relIdx < base.length; relIdx++) {
+		if (base[relIdx].releaseName !== existingReleases[relIdx].releaseName) {
+			return Result.ofFailed(`Contains unexpected releases. base:${base[relIdx].releaseName}, head:${existingReleases[relIdx].releaseName}`);
+		}
 	}
 
 	return Result.ofSuccess();
 }
 
+function isSameItems(base: string[], head: string[]) {
+	return base.length === head.length && base.every((item, idx) => item === head[idx]);
+}
+
 /**
  * topic -> developまたはtopic -> masterを想定したパターン。
  * head側の最新リリース配下に書き加えられているかをチェックする。
@@ -78,9 +84,9 @@ export function checkNewTopic(base: Release[], head: Release[]): Result {
 					return Result.ofFailed(`Category is different. base:${baseCategory.categoryName}, head:${headCategory.categoryName}`);
 				}
 
-				if (baseCategory.items.length !== headCategory.items.length) {
+				if (!isSameItems(baseCategory.items, headCategory.items)) {
 					if (headLatest.releaseName !== headItem.releaseName) {
-						// 最新リリース以外に追記されていた場合
+						// 最新リリース以外が変更されていた場合
 						return Result.ofFailed(`There is an error in the update history. expected additions:${headLatest.releaseName}, actual additions:${headItem.releaseName}`);
 					}
 				}

packages-private/changelog-checker/src/index.ts

@@ -18,7 +18,7 @@ function abort(message?: string) {
 
 function main() {
 	if (!fs.existsSync('./CHANGELOG-base.md') || !fs.existsSync('./CHANGELOG-head.md')) {
-		console.error('CHANGELOG-base.md or CHANGELOG-head.md is missing.');
+		abort('CHANGELOG-base.md or CHANGELOG-head.md is missing.');
 		return;
 	}
 

packages-private/changelog-checker/src/parser.ts

@@ -51,6 +51,9 @@ export function parseChangeLog(path: string): Release[] {
 			// リリース
 			release = new Release(toString(it));
 			releases.push(release);
+			// 直前のリリースのカテゴリを引き継ぐと、カテゴリ見出しの無いリスト項目が
+			// 前のリリースに混入するのでリセットする
+			category = null;
 		} else if (isHeading(it) && it.depth === 3 && release) {
 			// リリース配下のカテゴリ
 			category = new ReleaseCategory(toString(it));

packages-private/changelog-checker/test/checker.test.ts

@@ -3,52 +3,62 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import {expect, suite, test} from "vitest";
-import {Release, ReleaseCategory} from "../src/parser";
-import {checkNewRelease, checkNewTopic} from "../src/checker";
+import { expect, describe, test } from 'vitest';
+import { Release, ReleaseCategory } from '../src/parser.js';
+import { checkNewRelease, checkNewTopic } from '../src/checker.js';
 
-suite('checkNewRelease', () => {
+describe('checkNewRelease', () => {
 	test('headに新しいリリースがある1', () => {
-		const base = [new Release('2024.12.0')]
-		const head = [new Release('2024.12.1'), new Release('2024.12.0')]
+		const base = [new Release('2024.12.0')];
+		const head = [new Release('2024.12.1'), new Release('2024.12.0')];
 
-		const result = checkNewRelease(base, head)
+		const result = checkNewRelease(base, head);
 
-		expect(result.success).toBe(true)
-	})
+		expect(result.success).toBe(true);
+	});
 
 	test('headに新しいリリースがある2', () => {
-		const base = [new Release('2024.12.0')]
-		const head = [new Release('2024.12.2'), new Release('2024.12.1'), new Release('2024.12.0')]
+		const base = [new Release('2024.12.0')];
+		const head = [new Release('2024.12.2'), new Release('2024.12.1'), new Release('2024.12.0')];
 
-		const result = checkNewRelease(base, head)
-
-		expect(result.success).toBe(true)
-	})
+		const result = checkNewRelease(base, head);
 
+		expect(result.success).toBe(true);
+	});
 
 	test('リリースの数が同じ', () => {
-		const base = [new Release('2024.12.0')]
-		const head = [new Release('2024.12.0')]
+		const base = [new Release('2024.12.0')];
+		const head = [new Release('2024.12.0')];
 
-		const result = checkNewRelease(base, head)
+		const result = checkNewRelease(base, head);
 
-		console.log(result.message)
-		expect(result.success).toBe(false)
-	})
+		console.log(result.message);
+		expect(result.success).toBe(false);
+	});
 
 	test('baseにあるリリースがheadにない', () => {
-		const base = [new Release('2024.12.0')]
-		const head = [new Release('2024.12.2'), new Release('2024.12.1')]
+		const base = [new Release('2024.12.0')];
+		const head = [new Release('2024.12.2'), new Release('2024.12.1')];
 
-		const result = checkNewRelease(base, head)
+		const result = checkNewRelease(base, head);
 
-		console.log(result.message)
-		expect(result.success).toBe(false)
-	})
-})
+		console.log(result.message);
+		expect(result.success).toBe(false);
+	});
 
-suite('checkNewTopic', () => {
+	// 先頭だけ比較していると、より古いリリースの書き換えを見逃す
+	test('追加分の直後は一致しているが、より古いリリースが書き換えられている', () => {
+		const base = [new Release('2024.12.1'), new Release('2024.12.0')];
+		const head = [new Release('2024.12.2'), new Release('2024.12.1'), new Release('2024.11.0')];
+
+		const result = checkNewRelease(base, head);
+
+		console.log(result.message);
+		expect(result.success).toBe(false);
+	});
+});
+
+describe('checkNewTopic', () => {
 	test('追記なし', () => {
 		const base = [
 			new Release('2024.12.1', [
@@ -59,7 +69,7 @@ suite('checkNewTopic', () => {
 				new ReleaseCategory('Client', [
 					'feat3',
 					'feat4',
-				])
+				]),
 			]),
 			new Release('2024.12.0', [
 				new ReleaseCategory('Server', [
@@ -69,9 +79,9 @@ suite('checkNewTopic', () => {
 				new ReleaseCategory('Client', [
 					'feat3',
 					'feat4',
-				])
-			])
-		]
+				]),
+			]),
+		];
 
 		const head = [
 			new Release('2024.12.1', [
@@ -82,7 +92,7 @@ suite('checkNewTopic', () => {
 				new ReleaseCategory('Client', [
 					'feat3',
 					'feat4',
-				])
+				]),
 			]),
 			new Release('2024.12.0', [
 				new ReleaseCategory('Server', [
@@ -92,14 +102,14 @@ suite('checkNewTopic', () => {
 				new ReleaseCategory('Client', [
 					'feat3',
 					'feat4',
-				])
-			])
-		]
+				]),
+			]),
+		];
 
-		const result = checkNewTopic(base, head)
+		const result = checkNewTopic(base, head);
 
-		expect(result.success).toBe(true)
-	})
+		expect(result.success).toBe(true);
+	});
 
 	test('最新バージョンにカテゴリを追加したときはエラーにならない', () => {
 		const base = [
@@ -117,9 +127,9 @@ suite('checkNewTopic', () => {
 				new ReleaseCategory('Client', [
 					'feat3',
 					'feat4',
-				])
-			])
-		]
+				]),
+			]),
+		];
 
 		const head = [
 			new Release('2024.12.1', [
@@ -130,7 +140,7 @@ suite('checkNewTopic', () => {
 				new ReleaseCategory('Client', [
 					'feat3',
 					'feat4',
-				])
+				]),
 			]),
 			new Release('2024.12.0', [
 				new ReleaseCategory('Server', [
@@ -140,14 +150,14 @@ suite('checkNewTopic', () => {
 				new ReleaseCategory('Client', [
 					'feat3',
 					'feat4',
-				])
-			])
-		]
+				]),
+			]),
+		];
 
-		const result = checkNewTopic(base, head)
+		const result = checkNewTopic(base, head);
 
-		expect(result.success).toBe(true)
-	})
+		expect(result.success).toBe(true);
+	});
 
 	test('最新バージョンからカテゴリを削除したときはエラーにならない', () => {
 		const base = [
@@ -159,7 +169,7 @@ suite('checkNewTopic', () => {
 				new ReleaseCategory('Client', [
 					'feat3',
 					'feat4',
-				])
+				]),
 			]),
 			new Release('2024.12.0', [
 				new ReleaseCategory('Server', [
@@ -169,9 +179,9 @@ suite('checkNewTopic', () => {
 				new ReleaseCategory('Client', [
 					'feat3',
 					'feat4',
-				])
-			])
-		]
+				]),
+			]),
+		];
 
 		const head = [
 			new Release('2024.12.1', [
@@ -188,14 +198,14 @@ suite('checkNewTopic', () => {
 				new ReleaseCategory('Client', [
 					'feat3',
 					'feat4',
-				])
-			])
-		]
+				]),
+			]),
+		];
 
-		const result = checkNewTopic(base, head)
+		const result = checkNewTopic(base, head);
 
-		expect(result.success).toBe(true)
-	})
+		expect(result.success).toBe(true);
+	});
 
 	test('最新バージョンに追記したときはエラーにならない', () => {
 		const base = [
@@ -210,8 +220,8 @@ suite('checkNewTopic', () => {
 					'feat1',
 					'feat2',
 				]),
-			])
-		]
+			]),
+		];
 
 		const head = [
 			new Release('2024.12.1', [
@@ -226,13 +236,13 @@ suite('checkNewTopic', () => {
 					'feat1',
 					'feat2',
 				]),
-			])
-		]
+			]),
+		];
 
-		const result = checkNewTopic(base, head)
+		const result = checkNewTopic(base, head);
 
-		expect(result.success).toBe(true)
-	})
+		expect(result.success).toBe(true);
+	});
 
 	test('最新バージョンから削除したときはエラーにならない', () => {
 		const base = [
@@ -247,8 +257,8 @@ suite('checkNewTopic', () => {
 					'feat1',
 					'feat2',
 				]),
-			])
-		]
+			]),
+		];
 
 		const head = [
 			new Release('2024.12.1', [
@@ -261,13 +271,13 @@ suite('checkNewTopic', () => {
 					'feat1',
 					'feat2',
 				]),
-			])
-		]
+			]),
+		];
 
-		const result = checkNewTopic(base, head)
+		const result = checkNewTopic(base, head);
 
-		expect(result.success).toBe(true)
-	})
+		expect(result.success).toBe(true);
+	});
 
 	test('古いバージョンにカテゴリを追加したときはエラーになる', () => {
 		const base = [
@@ -282,8 +292,8 @@ suite('checkNewTopic', () => {
 					'feat1',
 					'feat2',
 				]),
-			])
-		]
+			]),
+		];
 
 		const head = [
 			new Release('2024.12.1', [
@@ -301,14 +311,14 @@ suite('checkNewTopic', () => {
 					'feat1',
 					'feat2',
 				]),
-			])
-		]
+			]),
+		];
 
-		const result = checkNewTopic(base, head)
+		const result = checkNewTopic(base, head);
 
-		console.log(result.message)
-		expect(result.success).toBe(false)
-	})
+		console.log(result.message);
+		expect(result.success).toBe(false);
+	});
 
 	test('古いバージョンからカテゴリを削除したときはエラーになる', () => {
 		const base = [
@@ -323,8 +333,8 @@ suite('checkNewTopic', () => {
 					'feat1',
 					'feat2',
 				]),
-			])
-		]
+			]),
+		];
 
 		const head = [
 			new Release('2024.12.1', [
@@ -334,14 +344,14 @@ suite('checkNewTopic', () => {
 				]),
 			]),
 			new Release('2024.12.0', [
-			])
-		]
+			]),
+		];
 
-		const result = checkNewTopic(base, head)
+		const result = checkNewTopic(base, head);
 
-		console.log(result.message)
-		expect(result.success).toBe(false)
-	})
+		console.log(result.message);
+		expect(result.success).toBe(false);
+	});
 
 	test('古いバージョンに追記したときはエラーになる', () => {
 		const base = [
@@ -356,8 +366,8 @@ suite('checkNewTopic', () => {
 					'feat1',
 					'feat2',
 				]),
-			])
-		]
+			]),
+		];
 
 		const head = [
 			new Release('2024.12.1', [
@@ -372,14 +382,14 @@ suite('checkNewTopic', () => {
 					'feat2',
 					'feat3',
 				]),
-			])
-		]
+			]),
+		];
 
-		const result = checkNewTopic(base, head)
+		const result = checkNewTopic(base, head);
 
-		console.log(result.message)
-		expect(result.success).toBe(false)
-	})
+		console.log(result.message);
+		expect(result.success).toBe(false);
+	});
 
 	test('古いバージョンから削除したときはエラーになる', () => {
 		const base = [
@@ -394,8 +404,8 @@ suite('checkNewTopic', () => {
 					'feat1',
 					'feat2',
 				]),
-			])
-		]
+			]),
+		];
 
 		const head = [
 			new Release('2024.12.1', [
@@ -408,12 +418,88 @@ suite('checkNewTopic', () => {
 				new ReleaseCategory('Server', [
 					'feat1',
 				]),
-			])
-		]
+			]),
+		];
 
-		const result = checkNewTopic(base, head)
+		const result = checkNewTopic(base, head);
 
-		console.log(result.message)
-		expect(result.success).toBe(false)
-	})
-})
+		console.log(result.message);
+		expect(result.success).toBe(false);
+	});
+
+	// 件数が同じでも内容が変わっていれば履歴の書き換えなのでエラーにする
+	test('古いバージョンの項目が書き換えられたときはエラーになる', () => {
+		const base = [
+			new Release('2024.12.1', [
+				new ReleaseCategory('Server', ['feat1']),
+			]),
+			new Release('2024.12.0', [
+				new ReleaseCategory('Server', ['feat1', 'feat2']),
+			]),
+		];
+
+		const head = [
+			new Release('2024.12.1', [
+				new ReleaseCategory('Server', ['feat1']),
+			]),
+			new Release('2024.12.0', [
+				new ReleaseCategory('Server', ['feat1', 'feat2-rewritten']),
+			]),
+		];
+
+		const result = checkNewTopic(base, head);
+
+		console.log(result.message);
+		expect(result.success).toBe(false);
+	});
+
+	test('古いバージョンの項目が並べ替えられたときはエラーになる', () => {
+		const base = [
+			new Release('2024.12.1', [
+				new ReleaseCategory('Server', ['feat1']),
+			]),
+			new Release('2024.12.0', [
+				new ReleaseCategory('Server', ['feat1', 'feat2']),
+			]),
+		];
+
+		const head = [
+			new Release('2024.12.1', [
+				new ReleaseCategory('Server', ['feat1']),
+			]),
+			new Release('2024.12.0', [
+				new ReleaseCategory('Server', ['feat2', 'feat1']),
+			]),
+		];
+
+		const result = checkNewTopic(base, head);
+
+		console.log(result.message);
+		expect(result.success).toBe(false);
+	});
+
+	// 最新リリースの書き換えは通常の編集なので許容する
+	test('最新バージョンの項目を書き換えたときはエラーにならない', () => {
+		const base = [
+			new Release('2024.12.1', [
+				new ReleaseCategory('Server', ['feat1']),
+			]),
+			new Release('2024.12.0', [
+				new ReleaseCategory('Server', ['feat1']),
+			]),
+		];
+
+		const head = [
+			new Release('2024.12.1', [
+				new ReleaseCategory('Server', ['feat1-rewritten']),
+			]),
+			new Release('2024.12.0', [
+				new ReleaseCategory('Server', ['feat1']),
+			]),
+		];
+
+		const result = checkNewTopic(base, head);
+
+		expect(result.success).toBe(true);
+	});
+});

packages-private/changelog-checker/tsconfig.json

@@ -14,18 +14,17 @@
 		"experimentalDecorators": true,
 		"noImplicitReturns": true,
 		"esModuleInterop": true,
-		"typeRoots": [
-			"./node_modules/@types"
-		],
+		"skipLibCheck": true,
+		"types": ["node"],
 		"lib": [
 			"esnext"
 		]
 	},
 	"include": [
-		"src/**/*"
+		"src/**/*",
+		"test/**/*"
 	],
 	"exclude": [
 		"node_modules",
-		"test/**/*"
 	]
 }

packages-private/diagnostics-backend/eslint.config.js

@@ -0,0 +1,25 @@
+import tsParser from '@typescript-eslint/parser';
+import sharedConfig from '../../packages/shared/eslint.config.js';
+
+// eslint-disable-next-line import/no-default-export
+export default [
+	...sharedConfig,
+	{
+		ignores: [
+			'**/node_modules',
+			'**/__snapshots__',
+			'test/fixtures',
+		],
+	},
+	{
+		files: ['**/*.ts', '**/*.tsx'],
+		languageOptions: {
+			parserOptions: {
+				parser: tsParser,
+				project: ['./tsconfig.json'],
+				sourceType: 'module',
+				tsconfigRootDir: import.meta.dirname,
+			},
+		},
+	},
+];

packages-private/diagnostics-backend/package.json

@@ -0,0 +1,27 @@
+{
+	"name": "diagnostics-backend",
+	"private": true,
+	"type": "module",
+	"scripts": {
+		"eslint": "eslint './**/*.{js,jsx,ts,tsx}'",
+		"inspect": "tsx src/inspect.ts",
+		"lint": "pnpm typecheck && pnpm eslint",
+		"measure": "tsx src/measure-once.ts",
+		"render-md": "tsx src/render-md.ts",
+		"test": "vitest run",
+		"typecheck": "tsc --noEmit"
+	},
+	"dependencies": {
+		"diagnostics-shared": "workspace:*",
+		"execa": "9.6.1"
+	},
+	"devDependencies": {
+		"@types/node": "26.1.1",
+		"@types/pg": "8.20.0",
+		"ioredis": "5.11.1",
+		"pg": "8.22.0",
+		"tsx": "4.23.1",
+		"typescript": "5.9.3",
+		"vitest": "4.1.10"
+	}
+}

packages-private/diagnostics-backend/src/compare.ts

@@ -0,0 +1,197 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { copyFile, rm, writeFile } from 'node:fs/promises';
+import { join, resolve } from 'node:path';
+import { execa } from 'execa';
+import { readBooleanEnv, readIntegerEnv, readOptionalEnv } from 'diagnostics-shared/env';
+import { median } from 'diagnostics-shared/stats';
+import { summarizeHeapSnapshotDataSamples, defaultHeapSnapshotBreakdownTopN } from 'diagnostics-shared/heap-snapshot';
+import { resetState } from './db';
+import {
+	clampHeapSnapshotRounds,
+	selectRepresentativeHeapSnapshotRound,
+	shouldCollectHeapSnapshot,
+} from './heap-snapshot-sampling';
+import { measureBackendMemory } from './measure';
+import { memoryPhases, type MemoryReport } from './types';
+
+const heapSnapshotLabels = ['base', 'head'] as const;
+
+type HeapSnapshotLabel = typeof heapSnapshotLabels[number];
+
+export type CompareOptions = {
+	baseDir: string;
+	headDir: string;
+	baseOutput: string;
+	headOutput: string;
+};
+
+const HEAP_SNAPSHOT_BREAKDOWN_TOP_N = readIntegerEnv('MK_MEMORY_HEAP_SNAPSHOT_BREAKDOWN_TOP_N', defaultHeapSnapshotBreakdownTopN, 1);
+// 成果物 (artifact) としてアップロードされるファイルの出力先。CIではworkspace直下を指す
+const HEAP_SNAPSHOT_OUTPUT_DIR = resolve(readOptionalEnv('MK_MEMORY_HEAP_SNAPSHOT_OUTPUT_DIR') ?? process.cwd());
+const HEAP_SNAPSHOT_WORK_DIRS = {
+	base: join(HEAP_SNAPSHOT_OUTPUT_DIR, 'base-heap-snapshots'),
+	head: join(HEAP_SNAPSHOT_OUTPUT_DIR, 'head-heap-snapshots'),
+};
+const HEAP_SNAPSHOT_OUTPUT_PATHS = {
+	base: join(HEAP_SNAPSHOT_OUTPUT_DIR, 'base-heap-snapshot.heapsnapshot'),
+	head: join(HEAP_SNAPSHOT_OUTPUT_DIR, 'head-heap-snapshot.heapsnapshot'),
+};
+
+export function summarizeSamples(samples: MemoryReport['samples']) {
+	const summary = {} as MemoryReport['summary'];
+
+	for (const phase of memoryPhases) {
+		summary[phase] = {
+			memoryUsage: {},
+		};
+
+		const metricKeys = new Set<string>();
+		for (const sample of samples) {
+			for (const key of Object.keys(sample.phases[phase].memoryUsage)) {
+				metricKeys.add(key);
+			}
+		}
+
+		for (const key of metricKeys) {
+			const values = samples.map(sample => sample.phases[phase].memoryUsage[key]);
+			summary[phase].memoryUsage[key] = median(values);
+		}
+
+		const heapSnapshot = summarizeHeapSnapshotDataSamples(
+			samples,
+			sample => sample.phases[phase].heapSnapshot,
+			{ breakdownTopN: HEAP_SNAPSHOT_BREAKDOWN_TOP_N },
+		);
+		if (heapSnapshot != null) summary[phase].heapSnapshot = heapSnapshot;
+	}
+
+	return summary;
+}
+
+type GenSampleOptions = {
+	collectHeapSnapshot?: boolean;
+	heapSnapshotSavePath?: string;
+};
+
+async function genSample(label: string, repoDir: string, round: number, options: GenSampleOptions = {}) {
+	process.stderr.write(`[${label}] Resetting database and Redis\n`);
+	await resetState();
+
+	process.stderr.write(`[${label}] Running migrations\n`);
+	// 出力はログとして流しつつ手元にも残す (失敗時にexecaが例外メッセージへ含めてくれる)
+	await execa('pnpm', ['--filter', 'backend', 'migrate'], {
+		cwd: repoDir,
+		stdout: ['pipe', process.stderr],
+		stderr: ['pipe', process.stderr],
+	});
+
+	process.stderr.write(`[${label}] Measuring memory\n`);
+	return await measureBackendMemory(resolve(repoDir, 'packages/backend'), {
+		// warmupラウンド (round <= 0) は捨てるので、重いheap snapshotは取らない
+		...(round <= 0 || options.collectHeapSnapshot === false ? { heapSnapshot: false } : {}),
+		heapSnapshotSavePath: options.heapSnapshotSavePath ?? null,
+	});
+}
+
+function heapSnapshotPath(label: HeapSnapshotLabel, round: number) {
+	return join(HEAP_SNAPSHOT_WORK_DIRS[label], `round-${round}.heapsnapshot`);
+}
+
+async function saveRepresentativeHeapSnapshot(label: HeapSnapshotLabel, samples: MemoryReport['samples'], summary: MemoryReport['summary']) {
+	const round = selectRepresentativeHeapSnapshotRound(
+		samples,
+		summary.afterGc.heapSnapshot?.categories.total,
+		sample => sample.phases.afterGc.heapSnapshot?.categories.total,
+	);
+	if (round == null) return;
+
+	await copyFile(heapSnapshotPath(label, round), HEAP_SNAPSHOT_OUTPUT_PATHS[label]);
+	process.stderr.write(`Selected ${label} heap snapshot round ${round} for artifact\n`);
+	await rm(HEAP_SNAPSHOT_WORK_DIRS[label], { recursive: true, force: true });
+}
+
+/**
+ * base / head を交互に計測してJSONレポートを書き出す。
+ * 交互にするのは、実行順やマシンの状態による偏りを両者に均等に載せるため。
+ */
+export async function compareBackendMemory(options: CompareOptions) {
+	const rounds = readIntegerEnv('MK_MEMORY_COMPARE_ROUNDS', 5, 1);
+	const warmupRounds = readIntegerEnv('MK_MEMORY_COMPARE_WARMUP_ROUNDS', 1, 0);
+	const heapSnapshotsEnabled = readBooleanEnv('MK_MEMORY_HEAP_SNAPSHOT', false);
+	const requestedHeapSnapshotRounds = heapSnapshotsEnabled
+		? readIntegerEnv('MK_MEMORY_HEAP_SNAPSHOT_ROUNDS', rounds, 1)
+		: 0;
+	const heapSnapshotRounds = clampHeapSnapshotRounds(rounds, requestedHeapSnapshotRounds);
+	const startedAt = new Date().toISOString();
+
+	for (const label of heapSnapshotLabels) {
+		await rm(HEAP_SNAPSHOT_WORK_DIRS[label], { recursive: true, force: true });
+		await rm(HEAP_SNAPSHOT_OUTPUT_PATHS[label], { force: true });
+	}
+
+	const reports = {
+		base: {
+			dir: options.baseDir,
+			samples: [] as MemoryReport['samples'],
+		},
+		head: {
+			dir: options.headDir,
+			samples: [] as MemoryReport['samples'],
+		},
+	};
+
+	for (let round = 1; round <= warmupRounds; round++) {
+		process.stderr.write(`Starting warmup round ${round}/${warmupRounds}\n`);
+		for (const label of heapSnapshotLabels) {
+			await genSample(label, reports[label].dir, -round);
+		}
+	}
+
+	for (let round = 1; round <= rounds; round++) {
+		const order = round % 2 === 1 ? ['base', 'head'] as const : ['head', 'base'] as const;
+		process.stderr.write(`Starting measurement round ${round}/${rounds}: ${order.join(' -> ')}\n`);
+
+		for (const label of order) {
+			const collectHeapSnapshot = shouldCollectHeapSnapshot(round, rounds, heapSnapshotRounds);
+			const sample = await genSample(label, reports[label].dir, round, {
+				collectHeapSnapshot,
+				...(collectHeapSnapshot ? { heapSnapshotSavePath: heapSnapshotPath(label, round) } : {}),
+			});
+			reports[label].samples.push({
+				...sample,
+				round,
+			});
+		}
+	}
+
+	const summaries = {
+		base: summarizeSamples(reports.base.samples),
+		head: summarizeSamples(reports.head.samples),
+	};
+	for (const label of heapSnapshotLabels) {
+		await saveRepresentativeHeapSnapshot(label, reports[label].samples, summaries[label]);
+	}
+
+	for (const label of heapSnapshotLabels) {
+		const report: MemoryReport = {
+			timestamp: new Date().toISOString(),
+			sampleCount: reports[label].samples.length,
+			aggregation: 'median',
+			comparison: {
+				strategy: 'interleaved-pairs',
+				rounds,
+				warmupRounds,
+				heapSnapshotRounds,
+				startedAt,
+			},
+			summary: summaries[label],
+			samples: reports[label].samples,
+		};
+
+		await writeFile(label === 'base' ? options.baseOutput : options.headOutput, `${JSON.stringify(report, null, 2)}\n`);
+	}
+}

packages-private/diagnostics-backend/src/db.ts

@@ -0,0 +1,35 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import Redis from 'ioredis';
+import pg from 'pg';
+
+/**
+ * 計測ラウンド間で状態を持ち越さないよう、テスト用DBを作り直しRedisを空にする。
+ * 接続先はCIのテスト用サービス (.github/misskey/test.yml) と揃えてある。
+ */
+export async function resetState() {
+	const postgres = new pg.Client({
+		host: '127.0.0.1',
+		port: 54312,
+		database: 'postgres',
+		user: 'postgres',
+	});
+
+	await postgres.connect();
+	try {
+		await postgres.query('DROP DATABASE IF EXISTS "test-misskey" WITH (FORCE)');
+		await postgres.query('CREATE DATABASE "test-misskey"');
+	} finally {
+		await postgres.end();
+	}
+
+	const redis = new Redis({ host: '127.0.0.1', port: 56312 });
+	try {
+		await redis.flushall();
+	} finally {
+		redis.disconnect();
+	}
+}

packages-private/diagnostics-backend/src/heap-snapshot-sampling.ts

@@ -0,0 +1,37 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export function clampHeapSnapshotRounds(totalRounds: number, requestedRounds: number) {
+	return Math.min(totalRounds, requestedRounds);
+}
+
+export function shouldCollectHeapSnapshot(round: number, totalRounds: number, requestedRounds: number) {
+	const snapshotRounds = clampHeapSnapshotRounds(totalRounds, requestedRounds);
+	return round > totalRounds - snapshotRounds;
+}
+
+/**
+ * 中央値に最も近いラウンドを代表として選ぶ。外れ値のスナップショットを成果物にしないため。
+ */
+export function selectRepresentativeHeapSnapshotRound<T extends { round: number }>(
+	samples: T[],
+	medianTotal: number | null | undefined,
+	getTotal: (sample: T) => number | null | undefined,
+) {
+	if (medianTotal == null || !Number.isFinite(medianTotal)) return null;
+
+	let selected: { round: number; distance: number } | null = null;
+	for (const sample of samples) {
+		const total = getTotal(sample);
+		if (total == null || !Number.isFinite(total)) continue;
+
+		const distance = Math.abs(total - medianTotal);
+		if (selected == null || distance < selected.distance || (distance === selected.distance && sample.round < selected.round)) {
+			selected = { round: sample.round, distance };
+		}
+	}
+
+	return selected?.round ?? null;
+}

packages-private/diagnostics-backend/src/inspect.ts

@@ -0,0 +1,27 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { resolve } from 'node:path';
+import { compareBackendMemory } from './compare';
+
+const [baseDirArg, headDirArg, baseOutputArg, headOutputArg] = process.argv.slice(2);
+
+// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+if (baseDirArg == null || headDirArg == null || baseOutputArg == null || headOutputArg == null) {
+	console.error('Usage: inspect <baseDir> <headDir> <baseOutput> <headOutput>');
+	process.exit(1);
+}
+
+try {
+	await compareBackendMemory({
+		baseDir: resolve(baseDirArg),
+		headDir: resolve(headDirArg),
+		baseOutput: resolve(baseOutputArg),
+		headOutput: resolve(headOutputArg),
+	});
+} catch (err) {
+	console.error(err);
+	process.exit(1);
+}

packages-private/diagnostics-backend/src/measure-once.ts

@@ -0,0 +1,29 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { resolve } from 'node:path';
+import { readOptionalEnv } from 'diagnostics-shared/env';
+import { measureBackendMemory } from './measure';
+
+// ローカルデバッグ用: バックエンド1回分の計測結果をJSONで出力する
+const [backendDirArg] = process.argv.slice(2);
+
+if (backendDirArg == null) {
+	console.error('Usage: measure <backendDir>');
+	process.exit(1);
+}
+
+try {
+	const sample = await measureBackendMemory(resolve(backendDirArg), {
+		heapSnapshotSavePath: readOptionalEnv('MK_MEMORY_HEAP_SNAPSHOT_SAVE_PATH'),
+	});
+	console.log(JSON.stringify(sample, null, 2));
+} catch (err) {
+	console.error(JSON.stringify({
+		error: err instanceof Error ? err.message : String(err),
+		timestamp: new Date().toISOString(),
+	}));
+	process.exit(1);
+}

packages-private/diagnostics-backend/src/measure/index.ts

@@ -0,0 +1,129 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import * as fs from 'node:fs/promises';
+import { tmpdir } from 'node:os';
+import { dirname, join } from 'node:path';
+import { readBooleanEnv, readIntegerEnv } from 'diagnostics-shared/env';
+import { analyzeHeapSnapshot, defaultHeapSnapshotBreakdownTopN, type HeapSnapshotData } from 'diagnostics-shared/heap-snapshot';
+import { getMemoryUsage, getSmapsRollupMemoryUsage } from './proc';
+import {
+	forkBackendServer,
+	getRuntimeMemoryUsage,
+	requestHeapSnapshot,
+	shutdownBackendServer,
+	triggerGc,
+	waitForServerReady,
+} from './server';
+import { measureMemoryUntilStable } from './stability';
+import type { MemorySample } from '../types';
+
+export type MeasureBackendMemoryOptions = {
+	/** heap snapshotを取得するか (既定: MK_MEMORY_HEAP_SNAPSHOT) */
+	heapSnapshot?: boolean;
+	/** 取得したheap snapshotの保存先。未指定なら解析後に破棄する */
+	heapSnapshotSavePath?: string | null;
+	heapSnapshotBreakdownTopN?: number;
+	heapSnapshotTimeoutMs?: number;
+	startupTimeoutMs?: number;
+	ipcTimeoutMs?: number;
+};
+
+function resolveOptions(options: MeasureBackendMemoryOptions) {
+	return {
+		heapSnapshot: options.heapSnapshot ?? readBooleanEnv('MK_MEMORY_HEAP_SNAPSHOT', false),
+		heapSnapshotSavePath: options.heapSnapshotSavePath ?? null,
+		heapSnapshotBreakdownTopN: options.heapSnapshotBreakdownTopN ?? readIntegerEnv('MK_MEMORY_HEAP_SNAPSHOT_BREAKDOWN_TOP_N', defaultHeapSnapshotBreakdownTopN, 1),
+		heapSnapshotTimeoutMs: options.heapSnapshotTimeoutMs ?? readIntegerEnv('MK_MEMORY_HEAP_SNAPSHOT_TIMEOUT_MS', 120000, 1),
+		startupTimeoutMs: options.startupTimeoutMs ?? readIntegerEnv('MK_MEMORY_STARTUP_TIMEOUT_MS', 120000, 1),
+		ipcTimeoutMs: options.ipcTimeoutMs ?? readIntegerEnv('MK_MEMORY_IPC_TIMEOUT_MS', 30000, 1),
+	};
+}
+
+/**
+ * バックエンドを1回起動し、GC後のメモリ使用量を計測して1サンプル分の結果を返す。
+ */
+export async function measureBackendMemory(backendDir: string, options: MeasureBackendMemoryOptions = {}): Promise<MemorySample> {
+	const settings = resolveOptions(options);
+	const serverProcess = forkBackendServer(backendDir);
+
+	// 起動完了メッセージを取りこぼさないよう、他のハンドラより先に待ち受ける
+	const serverReady = waitForServerReady(serverProcess, settings.startupTimeoutMs);
+
+	serverProcess.stdout?.on('data', (data) => {
+		process.stderr.write(`[server stdout] ${data}`);
+	});
+
+	serverProcess.stderr?.on('data', (data) => {
+		process.stderr.write(`[server stderr] ${data}`);
+	});
+
+	serverProcess.on('error', (err) => {
+		process.stderr.write(`[server error] ${err}\n`);
+	});
+
+	// 途中で失敗しても子プロセスを残さない。残すと次のラウンドがポート衝突で落ちる
+	try {
+		const startupStartTime = Date.now();
+		await serverReady;
+
+		const startupTime = Date.now() - startupStartTime;
+		process.stderr.write(`Server started in ${startupTime}ms\n`);
+
+		await triggerGc(serverProcess, settings.ipcTimeoutMs);
+
+		const pid = serverProcess.pid!;
+		const stableSmapsRollup = await measureMemoryUntilStable(() => getSmapsRollupMemoryUsage(pid));
+		const afterGc = {
+			memoryUsage: {
+				...await getMemoryUsage(pid),
+				...stableSmapsRollup.memoryUsage,
+				...await getRuntimeMemoryUsage(serverProcess, settings.ipcTimeoutMs),
+			},
+			stability: stableSmapsRollup.stability,
+		};
+		process.stderr.write(`Memory ${afterGc.stability.converged ? 'stabilized' : 'did not stabilize'} after ${afterGc.stability.readingCount} readings over ${Math.round(afterGc.stability.elapsedMs)}ms\n`);
+
+		const heapSnapshotAfterGc = await getHeapSnapshotStatistics(serverProcess, settings);
+
+		return {
+			timestamp: new Date().toISOString(),
+			phases: {
+				afterGc: {
+					memoryUsage: afterGc.memoryUsage,
+					memoryStability: afterGc.stability,
+					heapSnapshot: heapSnapshotAfterGc,
+				},
+			},
+		};
+	} finally {
+		await shutdownBackendServer(serverProcess);
+	}
+}
+
+async function getHeapSnapshotStatistics(
+	serverProcess: ReturnType<typeof forkBackendServer>,
+	settings: ReturnType<typeof resolveOptions>,
+): Promise<HeapSnapshotData | null> {
+	if (!settings.heapSnapshot) return null;
+
+	const snapshotPath = join(tmpdir(), `misskey-backend-heap-${process.pid}-${serverProcess.pid}-${Date.now()}.heapsnapshot`);
+	const writtenPath = await requestHeapSnapshot(serverProcess, snapshotPath, settings.heapSnapshotTimeoutMs);
+
+	try {
+		if (settings.heapSnapshotSavePath != null && settings.heapSnapshotSavePath !== '') {
+			await fs.mkdir(dirname(settings.heapSnapshotSavePath), { recursive: true });
+			await fs.copyFile(writtenPath, settings.heapSnapshotSavePath);
+		}
+
+		const snapshot = JSON.parse(await fs.readFile(writtenPath, 'utf-8'));
+		return analyzeHeapSnapshot(snapshot, { breakdownTopN: settings.heapSnapshotBreakdownTopN });
+	} finally {
+		// 数百MBになることがあるため、解析後は必ず消す
+		await fs.unlink(writtenPath).catch(err => {
+			process.stderr.write(`Failed to delete heap snapshot ${writtenPath}: ${err.message}\n`);
+		});
+	}
+}

packages-private/diagnostics-backend/src/measure/proc.ts

@@ -0,0 +1,43 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import * as fs from 'node:fs/promises';
+
+export const procStatusKeys = ['VmPeak', 'VmSize', 'VmHWM', 'VmRSS', 'VmData', 'VmStk', 'VmExe', 'VmLib', 'VmPTE', 'VmSwap'] as const;
+export const smapsRollupKeys = ['Pss', 'Shared_Clean', 'Shared_Dirty', 'Private_Clean', 'Private_Dirty', 'Swap', 'SwapPss'] as const;
+
+/**
+ * `/proc` 配下の `Key:  1234 kB` 形式のファイルから指定キーを取り出す。
+ * 1つでも欠けていると以降の集計が静かに壊れるため、見つからなければ例外にする。
+ */
+export function parseMemoryFile<KS extends readonly string[]>(content: string, keys: KS, path: string): Record<KS[number], number> {
+	const result = {} as Record<KS[number], number>;
+	for (const _key of keys) {
+		const key = _key as KS[number];
+		const match = content.match(new RegExp(`${key}:\\s+(\\d+)\\s+kB`));
+		if (match) {
+			result[key] = parseInt(match[1], 10);
+		} else {
+			throw new Error(`Failed to parse ${key} from ${path}`);
+		}
+	}
+	return result;
+}
+
+export function bytesToKiB(value: number) {
+	return Math.round(value / 1024);
+}
+
+export async function getMemoryUsage(pid: number) {
+	const path = `/proc/${pid}/status`;
+	const status = await fs.readFile(path, 'utf-8');
+	return parseMemoryFile(status, procStatusKeys, path);
+}
+
+export async function getSmapsRollupMemoryUsage(pid: number) {
+	const path = `/proc/${pid}/smaps_rollup`;
+	const smapsRollup = await fs.readFile(path, 'utf-8');
+	return parseMemoryFile(smapsRollup, smapsRollupKeys, path);
+}

packages-private/diagnostics-backend/src/measure/server.ts

@@ -0,0 +1,199 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { fork, type ChildProcess } from 'node:child_process';
+import { join } from 'node:path';
+import { bytesToKiB } from './proc';
+
+type GcMessage = 'gc ok' | 'gc unavailable';
+type RuntimeMemoryUsageMessage = {
+	type: 'memory usage';
+	value: NodeJS.MemoryUsage;
+};
+type HeapSnapshotMessage = {
+	type: 'heap snapshot';
+	path?: string;
+};
+type HeapSnapshotErrorMessage = {
+	type: 'heap snapshot error';
+	message: string;
+};
+type HeapSnapshotResponseMessage = HeapSnapshotMessage | HeapSnapshotErrorMessage;
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+	return value != null && typeof value === 'object';
+}
+
+function isGcMessage(message: unknown): message is GcMessage {
+	return message === 'gc ok' || message === 'gc unavailable';
+}
+
+function isRuntimeMemoryUsageMessage(message: unknown): message is RuntimeMemoryUsageMessage {
+	return isRecord(message) && message.type === 'memory usage' && isRecord(message.value);
+}
+
+function isHeapSnapshotResponseMessage(message: unknown): message is HeapSnapshotResponseMessage {
+	if (!isRecord(message)) return false;
+	if (message.type === 'heap snapshot') return true;
+	return message.type === 'heap snapshot error' && typeof message.message === 'string';
+}
+
+export function waitForMessage<T>(serverProcess: ChildProcess, predicate: (message: unknown) => message is T, description: string, timeout: number) {
+	return new Promise<T>((resolve, reject) => {
+		const cleanup = () => {
+			globalThis.clearTimeout(timer);
+			serverProcess.off('message', onMessage);
+			serverProcess.off('exit', onExit);
+			serverProcess.off('error', onError);
+			serverProcess.off('disconnect', onDisconnect);
+		};
+
+		const timer = globalThis.setTimeout(() => {
+			cleanup();
+			reject(new Error(`Timed out waiting for ${description}`));
+		}, timeout);
+
+		const onMessage = (message: unknown) => {
+			if (!predicate(message)) return;
+			cleanup();
+			resolve(message);
+		};
+
+		// 子が死んだ場合、待ち続けてもメッセージは来ない。
+		// タイムアウトまで待って誤解を招くエラーを出すより、理由を添えて即座に失敗させる
+		const onExit = (code: number | null, signal: string | null) => {
+			cleanup();
+			reject(new Error(`Server exited (code=${code}, signal=${signal}) while waiting for ${description}`));
+		};
+
+		const onError = (err: Error) => {
+			cleanup();
+			reject(new Error(`Server errored while waiting for ${description}: ${err.message}`));
+		};
+
+		const onDisconnect = () => {
+			cleanup();
+			reject(new Error(`Server IPC channel closed while waiting for ${description}`));
+		};
+
+		serverProcess.on('message', onMessage);
+		serverProcess.once('exit', onExit);
+		serverProcess.once('error', onError);
+		serverProcess.once('disconnect', onDisconnect);
+	});
+}
+
+/**
+ * ビルド済みバックエンドを子プロセスとして起動する。
+ * execArgv は親から引き継がず `--expose-gc` のみを渡す: 親は tsx 経由で動くため、
+ * 引き継ぐと計測対象プロセスにTSローダーが載ってしまいメモリ量が歪む。
+ */
+export function forkBackendServer(backendDir: string) {
+	return fork(join(backendDir, 'built/entry.js'), [], {
+		cwd: backendDir,
+		env: {
+			...process.env,
+			NODE_ENV: 'production',
+			MK_DISABLE_CLUSTERING: '1',
+			MK_ONLY_SERVER: '1',
+			MK_NO_DAEMONS: '1',
+		},
+		stdio: ['pipe', 'pipe', 'pipe', 'ipc'],
+		execArgv: ['--expose-gc'],
+	});
+}
+
+export function waitForServerReady(serverProcess: ChildProcess, timeout: number) {
+	return waitForMessage(
+		serverProcess,
+		(message): message is 'ok' => message === 'ok',
+		'server startup',
+		timeout,
+	);
+}
+
+export async function triggerGc(serverProcess: ChildProcess, timeout: number) {
+	// 送信前にlistenerを張らないと、応答を取りこぼす可能性がある
+	const ok = waitForMessage(serverProcess, isGcMessage, 'GC completion', timeout);
+
+	serverProcess.send('gc');
+
+	const message = await ok;
+	if (message === 'gc unavailable') {
+		throw new Error('GC is unavailable. Start the process with --expose-gc to enable this feature.');
+	}
+}
+
+export async function getRuntimeMemoryUsage(serverProcess: ChildProcess, timeout: number) {
+	const response = waitForMessage(
+		serverProcess,
+		isRuntimeMemoryUsageMessage,
+		'memory usage',
+		timeout,
+	);
+
+	serverProcess.send('memory usage');
+
+	const message = await response;
+	const memoryUsage = message.value;
+
+	// /proc 由来の値と単位を揃える
+	return {
+		HeapTotal: bytesToKiB(memoryUsage.heapTotal),
+		HeapUsed: bytesToKiB(memoryUsage.heapUsed),
+		External: bytesToKiB(memoryUsage.external),
+		ArrayBuffers: bytesToKiB(memoryUsage.arrayBuffers),
+	};
+}
+
+/**
+ * heap snapshotの書き出しを依頼し、実際に書かれたパスを返す。
+ */
+export async function requestHeapSnapshot(serverProcess: ChildProcess, snapshotPath: string, timeout: number) {
+	const response = waitForMessage(
+		serverProcess,
+		isHeapSnapshotResponseMessage,
+		'heap snapshot',
+		timeout,
+	);
+
+	serverProcess.send({
+		type: 'heap snapshot',
+		path: snapshotPath,
+	});
+
+	const message = await response;
+	if (message.type === 'heap snapshot error') {
+		throw new Error(`Failed to write heap snapshot: ${message.message}`);
+	}
+
+	return typeof message.path === 'string' ? message.path : snapshotPath;
+}
+
+/**
+ * SIGTERMで終了を促し、一定時間で落ちなければSIGKILLする。
+ */
+export async function shutdownBackendServer(serverProcess: ChildProcess) {
+	// 既に終了しているなら 'exit' はもう発火しないので、待つと無駄に10秒止まる
+	if (serverProcess.exitCode != null || serverProcess.signalCode != null) return;
+
+	await new Promise<void>(resolve => {
+		let forceTimer: NodeJS.Timeout | undefined;
+		const termTimer = globalThis.setTimeout(() => {
+			serverProcess.kill('SIGKILL');
+			// SIGKILLは無視できないので通常はここで 'exit' が来る。
+			// D状態などで落ちない場合に計測全体を止めないよう、待ち時間には上限を設ける
+			forceTimer = globalThis.setTimeout(resolve, 5000);
+		}, 10000);
+
+		serverProcess.once('exit', () => {
+			globalThis.clearTimeout(termTimer);
+			if (forceTimer != null) globalThis.clearTimeout(forceTimer);
+			resolve();
+		});
+
+		serverProcess.kill('SIGTERM');
+	});
+}

packages-private/diagnostics-backend/src/measure/stability.ts

@@ -0,0 +1,79 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { setTimeout } from 'node:timers/promises';
+
+type MemoryStabilityTimer = {
+	now: () => number;
+	wait: (durationMs: number) => Promise<void>;
+};
+
+const intervalMs = 2000;
+const maxWaitMs = 10000;
+const windowSize = 3;
+const slopeThresholdKiBPerSecond = 256;
+const stabilityMetrics = ['Pss', 'Private_Dirty'] as const;
+
+const defaultTimer: MemoryStabilityTimer = {
+	now: () => performance.now(),
+	wait: durationMs => setTimeout(durationMs),
+};
+
+function getMaxAbsoluteSlopes<T extends Record<string, number>>(readings: { elapsedMs: number; memoryUsage: T }[]) {
+	const result = {} as Record<typeof stabilityMetrics[number], number>;
+
+	for (const metric of stabilityMetrics) {
+		let maxAbsoluteSlope = 0;
+		for (let i = 1; i < readings.length; i++) {
+			const previous = readings[i - 1];
+			const current = readings[i];
+			const durationSeconds = (current.elapsedMs - previous.elapsedMs) / 1000;
+			maxAbsoluteSlope = Math.max(maxAbsoluteSlope, Math.abs(current.memoryUsage[metric] - previous.memoryUsage[metric]) / durationSeconds);
+		}
+		result[metric] = maxAbsoluteSlope;
+	}
+
+	return result;
+}
+
+/**
+ * メモリ使用量が落ち着くまで繰り返し読み取る。
+ * 起動直後は遅延初期化でじわじわ増え続けるため、直近 `windowSize` 件の傾きが十分小さくなるまで待つ。
+ */
+export async function measureMemoryUntilStable<T extends Record<string, number>>(
+	readMemoryUsage: () => Promise<T>,
+	timer: MemoryStabilityTimer = defaultTimer,
+) {
+	const startedAt = timer.now();
+	const readings: { elapsedMs: number; memoryUsage: T }[] = [];
+	let maxAbsoluteSlopesKiBPerSecond: Record<typeof stabilityMetrics[number], number> | null = null;
+
+	while (true) {
+		const memoryUsage = await readMemoryUsage();
+		const elapsedMs = timer.now() - startedAt;
+		readings.push({ elapsedMs, memoryUsage });
+
+		let converged = false;
+		if (readings.length >= windowSize) {
+			const latestSlopes = getMaxAbsoluteSlopes(readings.slice(-windowSize));
+			maxAbsoluteSlopesKiBPerSecond = latestSlopes;
+			converged = stabilityMetrics.every(metric => latestSlopes[metric] <= slopeThresholdKiBPerSecond);
+		}
+
+		if (converged || elapsedMs >= maxWaitMs) {
+			return {
+				memoryUsage,
+				stability: {
+					converged,
+					readingCount: readings.length,
+					elapsedMs,
+					maxAbsoluteSlopesKiBPerSecond,
+				},
+			};
+		}
+
+		await timer.wait(Math.min(intervalMs, maxWaitMs - elapsedMs));
+	}
+}

packages-private/diagnostics-backend/src/render-md.ts

@@ -0,0 +1,30 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { readFile, writeFile } from 'node:fs/promises';
+import { resolve } from 'node:path';
+import { readRequiredEnv } from 'diagnostics-shared/env';
+import { renderMemoryReportMarkdown } from './report/markdown';
+import type { MemoryReport } from './types';
+
+async function main() {
+	const [baseFileArg, headFileArg, outputFileArg] = process.argv.slice(2);
+	if (baseFileArg == null || headFileArg == null || outputFileArg == null) {
+		throw new Error('Usage: render-md <baseReport.json> <headReport.json> <output.md>');
+	}
+
+	const base = JSON.parse(await readFile(resolve(baseFileArg), 'utf8')) as MemoryReport;
+	const head = JSON.parse(await readFile(resolve(headFileArg), 'utf8')) as MemoryReport;
+
+	await writeFile(resolve(outputFileArg), renderMemoryReportMarkdown(base, head, {
+		baseHeapSnapshotUrl: readRequiredEnv('MK_MEMORY_HEAP_SNAPSHOT_ARTIFACT_URL_BASE'),
+		headHeapSnapshotUrl: readRequiredEnv('MK_MEMORY_HEAP_SNAPSHOT_ARTIFACT_URL_HEAD'),
+	}));
+}
+
+await main().catch(err => {
+	console.error(err);
+	process.exit(1);
+});

packages-private/diagnostics-backend/src/report/markdown.ts

@@ -0,0 +1,174 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { formatKiBAsMb } from 'diagnostics-shared/format';
+import { renderHeapSnapshotTable, type HeapSnapshotReport } from 'diagnostics-shared/heap-snapshot';
+import { renderMetricComparisonTable } from 'diagnostics-shared/metric-table';
+import {
+	independentDeltaSummary,
+	isOutsideObservedNoise,
+	type IndependentDeltaSummary,
+} from 'diagnostics-shared/stats';
+import type { MemoryPhase, MemoryReport } from '../types';
+
+export type RenderMemoryReportOptions = {
+	baseHeapSnapshotUrl: string;
+	headHeapSnapshotUrl: string;
+};
+
+const memoryReportPhases = [
+	{
+		key: 'afterGc',
+		title: 'After GC',
+	},
+] as const satisfies readonly { key: MemoryPhase; title: string }[];
+
+const memoryMetrics = [
+	'HeapUsed',
+	'Pss',
+	'USS',
+	'External',
+] as const;
+
+type MemoryMetric = typeof memoryMetrics[number];
+
+const memoryColorThresholdKiB = 100;
+
+function formatMemoryMetricName(metric: MemoryMetric) {
+	return metric === 'Pss' ? 'PSS' : metric;
+}
+
+function getMemoryValueFromSample(sample: MemoryReport['samples'][number], phase: MemoryPhase, metric: MemoryMetric) {
+	const memoryUsage = sample.phases[phase].memoryUsage;
+	// USSは直接取れないのでPrivateの合算で近似する
+	if (metric !== 'USS') return memoryUsage[metric];
+	return memoryUsage.Private_Clean + memoryUsage.Private_Dirty;
+}
+
+function summarizeMemoryMetric(base: MemoryReport, head: MemoryReport, phase: MemoryPhase, metric: MemoryMetric) {
+	return independentDeltaSummary(
+		base.samples,
+		head.samples,
+		sample => getMemoryValueFromSample(sample, phase, metric),
+	);
+}
+
+function getDeltaPercent(summary: IndependentDeltaSummary) {
+	if (summary.baseMedian === 0) return null;
+	return summary.delta * 100 / summary.baseMedian;
+}
+
+function renderMainTableForPhase(base: MemoryReport, head: MemoryReport, phase: MemoryPhase) {
+	return renderMetricComparisonTable(
+		base.samples,
+		head.samples,
+		memoryMetrics.map(metric => ({
+			label: `**${formatMemoryMetricName(metric)}**`,
+			getValue: sample => getMemoryValueFromSample(sample, phase, metric),
+			formatValue: formatKiBAsMb,
+			absoluteThreshold: memoryColorThresholdKiB,
+		})),
+		{ onlySignificantChanges: true },
+	);
+}
+
+function toHeapSnapshotReport(report: MemoryReport): HeapSnapshotReport | null {
+	const summary = report.summary.afterGc.heapSnapshot;
+	if (summary == null) return null;
+
+	return {
+		summary,
+		samples: report.samples.flatMap(sample => {
+			const data = sample.phases.afterGc.heapSnapshot;
+			return data == null ? [] : [{ round: sample.round, data }];
+		}),
+	};
+}
+
+function renderHeapSnapshotSection(base: MemoryReport, head: MemoryReport) {
+	const baseHeapSnapshotReport = toHeapSnapshotReport(base);
+	const headHeapSnapshotReport = toHeapSnapshotReport(head);
+	if (baseHeapSnapshotReport == null || headHeapSnapshotReport == null) return null;
+
+	const table = renderHeapSnapshotTable(baseHeapSnapshotReport, headHeapSnapshotReport);
+
+	const lines = [
+		'### V8 Heap Snapshot Statistics',
+		'',
+		table,
+		'',
+	];
+
+	// Sankeyはノイズが多く読み取りづらかったため現在は無効。復活させる余地を残して残置する
+	for (const graph of [
+		//renderHeapSnapshotSankey(baseHeapSnapshotReport, 'Base'),
+		//renderHeapSnapshotSankey(headHeapSnapshotReport, 'Head'),
+	] as (string | null)[]) {
+		if (graph == null) continue;
+		lines.push(graph);
+		lines.push('');
+	}
+
+	return lines.join('\n');
+}
+
+function countNonConvergedMemorySamples(base: MemoryReport, head: MemoryReport) {
+	return [base, head]
+		.flatMap(report => report.samples)
+		.filter(sample => memoryReportPhases.some(phase => !sample.phases[phase.key].memoryStability.converged))
+		.length;
+}
+
+export function renderMemoryReportMarkdown(base: MemoryReport, head: MemoryReport, options: RenderMemoryReportOptions) {
+	const lines = [
+		'## ⚙️ Backend Diagnostics Report',
+		'',
+	];
+
+	//const summary = measurementSummary(base, head);
+	//if (summary != null) {
+	//	lines.push(summary);
+	//	lines.push('');
+	//}
+
+	for (const phase of memoryReportPhases) {
+		lines.push(`### Memory: ${phase.title}`);
+		lines.push(renderMainTableForPhase(base, head, phase.key));
+		lines.push('');
+	}
+
+	lines.push('');
+
+	const nonConvergedSamples = countNonConvergedMemorySamples(base, head);
+	if (nonConvergedSamples > 0) {
+		const noun = nonConvergedSamples === 1 ? 'sample' : 'samples';
+		lines.push(`⚠️ **Measurement warning**: ${nonConvergedSamples} memory ${noun} did not converge.`);
+		lines.push('');
+	}
+
+	const heapSnapshotSection = renderHeapSnapshotSection(base, head);
+	if (heapSnapshotSection != null) {
+		lines.push(heapSnapshotSection);
+		lines.push('');
+	}
+
+	lines.push(`Download representative heap snapshot: [base](${options.baseHeapSnapshotUrl}) / [head](${options.headHeapSnapshotUrl})`);
+	lines.push('');
+
+	const warningMetric = 'Pss';
+	const warningSummary = summarizeMemoryMetric(base, head, 'afterGc', warningMetric);
+	const warningDiffPercent = getDeltaPercent(warningSummary);
+	if (
+		warningSummary.delta > 0 &&
+		warningDiffPercent != null &&
+		warningDiffPercent > 5 &&
+		isOutsideObservedNoise(warningSummary)
+	) {
+		lines.push(`⚠️ **Warning**: Memory usage (${formatMemoryMetricName(warningMetric)}) has increased by more than 5% and exceeds the observed sample noise. Please verify this is not an unintended change.`);
+		lines.push('');
+	}
+
+	return `${lines.join('\n')}\n`;
+}

packages-private/diagnostics-backend/src/types.ts

@@ -0,0 +1,50 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import type { HeapSnapshotData } from 'diagnostics-shared/heap-snapshot';
+
+/** 計測フェーズ。将来的に増やせるようリスト化してある */
+export const memoryPhases = ['afterGc'] as const;
+
+export type MemoryPhase = typeof memoryPhases[number];
+
+export type MemoryStability = {
+	converged: boolean;
+	readingCount: number;
+	elapsedMs: number;
+	maxAbsoluteSlopesKiBPerSecond: Record<string, number> | null;
+};
+
+/** バックエンドを1回起動して得られる計測結果 */
+export type MemorySample = {
+	timestamp: string;
+	phases: Record<MemoryPhase, {
+		/** /proc 由来の値はKiB、ランタイム由来の値もKiBに揃えてある */
+		memoryUsage: Record<string, number>;
+		memoryStability: MemoryStability;
+		heapSnapshot: HeapSnapshotData | null;
+	}>;
+};
+
+/** base / head それぞれについて出力されるJSONレポート */
+export type MemoryReport = {
+	timestamp: string;
+	sampleCount: number;
+	aggregation: string;
+	comparison?: {
+		strategy: string;
+		rounds: number;
+		warmupRounds: number;
+		heapSnapshotRounds?: number;
+		startedAt: string;
+	};
+	summary: Record<MemoryPhase, {
+		memoryUsage: Record<string, number>;
+		heapSnapshot?: HeapSnapshotData;
+	}>;
+	samples: (MemorySample & {
+		round: number;
+	})[];
+};

packages-private/diagnostics-backend/test/__snapshots__/render-md.md

@@ -0,0 +1,31 @@
+## ⚙️ Backend Diagnostics Report
+
+### Memory: After GC
+| Metric | @ Base | @ Head | Δ | MAD |
+| --- | ---: | ---: | ---: | ---: |
+| **HeapUsed** | 152 MB <br> ± 1 MB | 168 MB <br> ± 1 MB | $\color{orange}{\text{+16~MB}}$<br>$\color{orange}{\text{+10.5\\%}}$ | 1.4 MB |
+| **PSS** | 202 MB <br> ± 1 MB | 218 MB <br> ± 1 MB | $\color{orange}{\text{+16~MB}}$<br>$\color{orange}{\text{+7.9\\%}}$ | 1.4 MB |
+| **USS** | 184 MB <br> ± 1 MB | 200 MB <br> ± 1 MB | $\color{orange}{\text{+16~MB}}$<br>$\color{orange}{\text{+8.7\\%}}$ | 1.4 MB |
+
+<small><i>Only metrics showing significant changes are displayed.</i></small>
+
+
+### V8 Heap Snapshot Statistics
+
+| Metric | @&nbsp;Base | @&nbsp;Head | Δ | MAD |
+| --- | ---: | ---: | ---: | ---: |
+| $\color{gray}{\rule{8pt}{8pt}}$ **Total** | 40 MB <br> ± 200 KB | 44 MB <br> ± 200 KB | $\color{orange}{\text{+3.2 MB}}$<br>$\color{orange}{\text{+7.9\\%}}$ | 283 KB |
+| | | | | |
+| $\color{orange}{\rule{8pt}{8pt}}$ **Code** | 4.7 MB | 5.1 MB | $\color{orange}{\text{+376 KB}}$ | 33 KB |
+| $\color{red}{\rule{8pt}{8pt}}$ **Strings** | 4.4 MB | 4.8 MB | $\color{orange}{\text{+352 KB}}$ | 31 KB |
+| $\color{cyan}{\rule{8pt}{8pt}}$ **JS arrays** | 4.1 MB | 4.5 MB | $\color{orange}{\text{+328 KB}}$ | 29 KB |
+| $\color{green}{\rule{8pt}{8pt}}$ **Typed arrays** | 3.8 MB | 4.1 MB | $\color{orange}{\text{+304 KB}}$ | 27 KB |
+| $\color{yellow}{\rule{8pt}{8pt}}$ **System objects** | 3.5 MB | 3.8 MB | $\color{orange}{\text{+280 KB}}$ | 25 KB |
+| $\color{violet}{\rule{8pt}{8pt}}$ **Other JS objs** | 3.2 MB | 3.5 MB | $\color{orange}{\text{+256 KB}}$ | 23 KB |
+| $\color{pink}{\rule{8pt}{8pt}}$ **Other non-JS objs** | 2.9 MB | 3.2 MB | $\color{orange}{\text{+232 KB}}$ | 21 KB |
+
+
+Download representative heap snapshot: [base](https://example.invalid/base) / [head](https://example.invalid/head)
+
+⚠️ **Warning**: Memory usage (PSS) has increased by more than 5% and exceeds the observed sample noise. Please verify this is not an unintended change.
+

packages-private/diagnostics-backend/test/fixtures/base.json

@@ -0,0 +1,200 @@
+{
+  "timestamp": "2026-07-18T07:57:17.653Z",
+  "sampleCount": 3,
+  "aggregation": "median",
+  "comparison": {
+    "strategy": "interleaved-pairs",
+    "rounds": 3,
+    "warmupRounds": 1,
+    "startedAt": "2026-07-18T07:57:17.653Z"
+  },
+  "summary": {
+    "afterGc": {
+      "memoryUsage": {
+        "VmRSS": 202000,
+        "Pss": 202000,
+        "Private_Clean": 2020,
+        "Private_Dirty": 182000,
+        "HeapUsed": 152000,
+        "HeapTotal": 170000,
+        "External": 8200,
+        "ArrayBuffers": 2000
+      },
+      "heapSnapshot": {
+        "categories": {
+          "total": 40400000,
+          "code": 4747000,
+          "strings": 4444000,
+          "jsArrays": 4141000,
+          "typedArrays": 3838000,
+          "systemObjects": 3535000,
+          "otherJsObjects": 3232000,
+          "otherNonJsObjects": 2929000
+        },
+        "nodeCounts": {
+          "total": 404000,
+          "code": 47470,
+          "strings": 44440,
+          "jsArrays": 41410,
+          "typedArrays": 38380,
+          "systemObjects": 35350,
+          "otherJsObjects": 32320,
+          "otherNonJsObjects": 29290
+        },
+        "breakdowns": {}
+      }
+    }
+  },
+  "samples": [
+    {
+      "round": 1,
+      "timestamp": "2026-07-18T07:57:17.652Z",
+      "phases": {
+        "afterGc": {
+          "memoryUsage": {
+            "VmRSS": 201000,
+            "Pss": 201000,
+            "Private_Clean": 2010,
+            "Private_Dirty": 181000,
+            "HeapUsed": 151000,
+            "HeapTotal": 170000,
+            "External": 8100,
+            "ArrayBuffers": 2000
+          },
+          "memoryStability": {
+            "converged": true,
+            "readingCount": 3,
+            "elapsedMs": 4000,
+            "maxAbsoluteSlopesKiBPerSecond": {
+              "Pss": 10,
+              "Private_Dirty": 5
+            }
+          },
+          "heapSnapshot": {
+            "categories": {
+              "total": 40200000,
+              "code": 4723500,
+              "strings": 4422000,
+              "jsArrays": 4120500,
+              "typedArrays": 3819000,
+              "systemObjects": 3517500,
+              "otherJsObjects": 3216000,
+              "otherNonJsObjects": 2914500
+            },
+            "nodeCounts": {
+              "total": 402000,
+              "code": 47235,
+              "strings": 44220,
+              "jsArrays": 41205,
+              "typedArrays": 38190,
+              "systemObjects": 35175,
+              "otherJsObjects": 32160,
+              "otherNonJsObjects": 29145
+            },
+            "breakdowns": {}
+          }
+        }
+      }
+    },
+    {
+      "round": 2,
+      "timestamp": "2026-07-18T07:57:17.653Z",
+      "phases": {
+        "afterGc": {
+          "memoryUsage": {
+            "VmRSS": 202000,
+            "Pss": 202000,
+            "Private_Clean": 2020,
+            "Private_Dirty": 182000,
+            "HeapUsed": 152000,
+            "HeapTotal": 170000,
+            "External": 8200,
+            "ArrayBuffers": 2000
+          },
+          "memoryStability": {
+            "converged": true,
+            "readingCount": 3,
+            "elapsedMs": 4000,
+            "maxAbsoluteSlopesKiBPerSecond": {
+              "Pss": 10,
+              "Private_Dirty": 5
+            }
+          },
+          "heapSnapshot": {
+            "categories": {
+              "total": 40400000,
+              "code": 4747000,
+              "strings": 4444000,
+              "jsArrays": 4141000,
+              "typedArrays": 3838000,
+              "systemObjects": 3535000,
+              "otherJsObjects": 3232000,
+              "otherNonJsObjects": 2929000
+            },
+            "nodeCounts": {
+              "total": 404000,
+              "code": 47470,
+              "strings": 44440,
+              "jsArrays": 41410,
+              "typedArrays": 38380,
+              "systemObjects": 35350,
+              "otherJsObjects": 32320,
+              "otherNonJsObjects": 29290
+            },
+            "breakdowns": {}
+          }
+        }
+      }
+    },
+    {
+      "round": 3,
+      "timestamp": "2026-07-18T07:57:17.653Z",
+      "phases": {
+        "afterGc": {
+          "memoryUsage": {
+            "VmRSS": 203000,
+            "Pss": 203000,
+            "Private_Clean": 2030,
+            "Private_Dirty": 183000,
+            "HeapUsed": 153000,
+            "HeapTotal": 170000,
+            "External": 8300,
+            "ArrayBuffers": 2000
+          },
+          "memoryStability": {
+            "converged": true,
+            "readingCount": 3,
+            "elapsedMs": 4000,
+            "maxAbsoluteSlopesKiBPerSecond": {
+              "Pss": 10,
+              "Private_Dirty": 5
+            }
+          },
+          "heapSnapshot": {
+            "categories": {
+              "total": 40600000,
+              "code": 4770500,
+              "strings": 4466000,
+              "jsArrays": 4161500,
+              "typedArrays": 3857000,
+              "systemObjects": 3552500,
+              "otherJsObjects": 3248000,
+              "otherNonJsObjects": 2943500
+            },
+            "nodeCounts": {
+              "total": 406000,
+              "code": 47705,
+              "strings": 44660,
+              "jsArrays": 41615,
+              "typedArrays": 38570,
+              "systemObjects": 35525,
+              "otherJsObjects": 32480,
+              "otherNonJsObjects": 29435
+            },
+            "breakdowns": {}
+          }
+        }
+      }
+    }
+  ]
+}

packages-private/diagnostics-backend/test/fixtures/head.json

@@ -0,0 +1,200 @@
+{
+  "timestamp": "2026-07-18T07:57:17.654Z",
+  "sampleCount": 3,
+  "aggregation": "median",
+  "comparison": {
+    "strategy": "interleaved-pairs",
+    "rounds": 3,
+    "warmupRounds": 1,
+    "startedAt": "2026-07-18T07:57:17.654Z"
+  },
+  "summary": {
+    "afterGc": {
+      "memoryUsage": {
+        "VmRSS": 218000,
+        "Pss": 218000,
+        "Private_Clean": 2020,
+        "Private_Dirty": 198000,
+        "HeapUsed": 168000,
+        "HeapTotal": 186000,
+        "External": 8200,
+        "ArrayBuffers": 2000
+      },
+      "heapSnapshot": {
+        "categories": {
+          "total": 43600000,
+          "code": 5123000,
+          "strings": 4796000,
+          "jsArrays": 4469000,
+          "typedArrays": 4142000,
+          "systemObjects": 3815000,
+          "otherJsObjects": 3488000,
+          "otherNonJsObjects": 3161000
+        },
+        "nodeCounts": {
+          "total": 436000,
+          "code": 51230,
+          "strings": 47960,
+          "jsArrays": 44690,
+          "typedArrays": 41420,
+          "systemObjects": 38150,
+          "otherJsObjects": 34880,
+          "otherNonJsObjects": 31610
+        },
+        "breakdowns": {}
+      }
+    }
+  },
+  "samples": [
+    {
+      "round": 1,
+      "timestamp": "2026-07-18T07:57:17.654Z",
+      "phases": {
+        "afterGc": {
+          "memoryUsage": {
+            "VmRSS": 217000,
+            "Pss": 217000,
+            "Private_Clean": 2010,
+            "Private_Dirty": 197000,
+            "HeapUsed": 167000,
+            "HeapTotal": 186000,
+            "External": 8100,
+            "ArrayBuffers": 2000
+          },
+          "memoryStability": {
+            "converged": true,
+            "readingCount": 3,
+            "elapsedMs": 4000,
+            "maxAbsoluteSlopesKiBPerSecond": {
+              "Pss": 10,
+              "Private_Dirty": 5
+            }
+          },
+          "heapSnapshot": {
+            "categories": {
+              "total": 43400000,
+              "code": 5099500,
+              "strings": 4774000,
+              "jsArrays": 4448500,
+              "typedArrays": 4123000,
+              "systemObjects": 3797500,
+              "otherJsObjects": 3472000,
+              "otherNonJsObjects": 3146500
+            },
+            "nodeCounts": {
+              "total": 434000,
+              "code": 50995,
+              "strings": 47740,
+              "jsArrays": 44485,
+              "typedArrays": 41230,
+              "systemObjects": 37975,
+              "otherJsObjects": 34720,
+              "otherNonJsObjects": 31465
+            },
+            "breakdowns": {}
+          }
+        }
+      }
+    },
+    {
+      "round": 2,
+      "timestamp": "2026-07-18T07:57:17.654Z",
+      "phases": {
+        "afterGc": {
+          "memoryUsage": {
+            "VmRSS": 218000,
+            "Pss": 218000,
+            "Private_Clean": 2020,
+            "Private_Dirty": 198000,
+            "HeapUsed": 168000,
+            "HeapTotal": 186000,
+            "External": 8200,
+            "ArrayBuffers": 2000
+          },
+          "memoryStability": {
+            "converged": true,
+            "readingCount": 3,
+            "elapsedMs": 4000,
+            "maxAbsoluteSlopesKiBPerSecond": {
+              "Pss": 10,
+              "Private_Dirty": 5
+            }
+          },
+          "heapSnapshot": {
+            "categories": {
+              "total": 43600000,
+              "code": 5123000,
+              "strings": 4796000,
+              "jsArrays": 4469000,
+              "typedArrays": 4142000,
+              "systemObjects": 3815000,
+              "otherJsObjects": 3488000,
+              "otherNonJsObjects": 3161000
+            },
+            "nodeCounts": {
+              "total": 436000,
+              "code": 51230,
+              "strings": 47960,
+              "jsArrays": 44690,
+              "typedArrays": 41420,
+              "systemObjects": 38150,
+              "otherJsObjects": 34880,
+              "otherNonJsObjects": 31610
+            },
+            "breakdowns": {}
+          }
+        }
+      }
+    },
+    {
+      "round": 3,
+      "timestamp": "2026-07-18T07:57:17.654Z",
+      "phases": {
+        "afterGc": {
+          "memoryUsage": {
+            "VmRSS": 219000,
+            "Pss": 219000,
+            "Private_Clean": 2030,
+            "Private_Dirty": 199000,
+            "HeapUsed": 169000,
+            "HeapTotal": 186000,
+            "External": 8300,
+            "ArrayBuffers": 2000
+          },
+          "memoryStability": {
+            "converged": true,
+            "readingCount": 3,
+            "elapsedMs": 4000,
+            "maxAbsoluteSlopesKiBPerSecond": {
+              "Pss": 10,
+              "Private_Dirty": 5
+            }
+          },
+          "heapSnapshot": {
+            "categories": {
+              "total": 43800000,
+              "code": 5146500,
+              "strings": 4818000,
+              "jsArrays": 4489500,
+              "typedArrays": 4161000,
+              "systemObjects": 3832500,
+              "otherJsObjects": 3504000,
+              "otherNonJsObjects": 3175500
+            },
+            "nodeCounts": {
+              "total": 438000,
+              "code": 51465,
+              "strings": 48180,
+              "jsArrays": 44895,
+              "typedArrays": 41610,
+              "systemObjects": 38325,
+              "otherJsObjects": 35040,
+              "otherNonJsObjects": 31755
+            },
+            "breakdowns": {}
+          }
+        }
+      }
+    }
+  ]
+}

packages-private/diagnostics-backend/test/heap-snapshot-sampling.test.ts

@@ -0,0 +1,42 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { describe, expect, test } from 'vitest';
+import {
+	clampHeapSnapshotRounds,
+	selectRepresentativeHeapSnapshotRound,
+	shouldCollectHeapSnapshot,
+} from '../src/heap-snapshot-sampling';
+
+describe('heap snapshot sampling', () => {
+	test('collects only the final requested rounds', () => {
+		const selected = Array.from({ length: 15 }, (_, index) => index + 1)
+			.filter(round => shouldCollectHeapSnapshot(round, 15, 3));
+		expect(selected).toStrictEqual([13, 14, 15]);
+	});
+
+	test('clamps the requested count to the measured round count', () => {
+		expect(clampHeapSnapshotRounds(5, 20)).toBe(5);
+		expect(Array.from({ length: 5 }, (_, index) => index + 1)
+			.filter(round => shouldCollectHeapSnapshot(round, 5, 20)))
+			.toStrictEqual([1, 2, 3, 4, 5]);
+	});
+
+	test('collects no snapshots when the effective count is zero', () => {
+		expect(Array.from({ length: 5 }, (_, index) => index + 1)
+			.filter(round => shouldCollectHeapSnapshot(round, 5, 0)))
+			.toStrictEqual([]);
+	});
+
+	test('selects the snapshot nearest the median and ignores missing rounds', () => {
+		const samples = [
+			{ round: 12, total: null },
+			{ round: 13, total: 100 },
+			{ round: 14, total: 110 },
+			{ round: 15, total: 130 },
+		];
+		expect(selectRepresentativeHeapSnapshotRound(samples, 110, sample => sample.total)).toBe(14);
+	});
+});

packages-private/diagnostics-backend/test/render-md.test.ts

@@ -0,0 +1,136 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { readFile } from 'node:fs/promises';
+import { join } from 'node:path';
+import { expect, test } from 'vitest';
+import { pairedDeltaSummary } from 'diagnostics-shared/stats';
+import { renderMemoryReportMarkdown } from '../src/report/markdown';
+import type { MemoryReport } from '../src/types';
+
+const fixturesDir = join(import.meta.dirname, 'fixtures');
+
+async function loadFixture(name: string) {
+	return JSON.parse(await readFile(join(fixturesDir, `${name}.json`), 'utf8')) as MemoryReport;
+}
+
+function replacePssSamples(report: MemoryReport, values: number[]) {
+	const templates = structuredClone(report.samples);
+	report.samples = values.map((Pss, index) => {
+		const sample = structuredClone(templates[index % templates.length]);
+		sample.round = index + 1;
+		sample.phases.afterGc.memoryUsage.Pss = Pss;
+		const privateClean = sample.phases.afterGc.memoryUsage.Private_Clean;
+		sample.phases.afterGc.memoryUsage.Private_Dirty = Pss - privateClean;
+		return sample;
+	});
+	report.sampleCount = report.samples.length;
+	return report;
+}
+
+function findMetricRow(markdown: string, metric: string) {
+	const row = markdown.split('\n').find(line => line.startsWith(`| **${metric}**`));
+	if (row === undefined) throw new Error(`expected memory report to contain a ${metric} row`);
+	return row;
+}
+
+/**
+ * 出力をゴールデンファイルで固定する。
+ * 意図的に変更したときは `vitest -u` で更新し、__snapshots__ の差分もレビューすること。
+ */
+test('renders the backend memory report', async () => {
+	const markdown = renderMemoryReportMarkdown(await loadFixture('base'), await loadFixture('head'), {
+		baseHeapSnapshotUrl: 'https://example.invalid/base',
+		headHeapSnapshotUrl: 'https://example.invalid/head',
+	});
+
+	await expect(markdown).toMatchFileSnapshot('./__snapshots__/render-md.md');
+});
+
+test('throws when filtering leaves fewer than two heap snapshots per side', async () => {
+	const base = await loadFixture('base');
+	const head = await loadFixture('head');
+	for (const report of [base, head]) {
+		for (const sample of report.samples.slice(0, -1)) {
+			sample.phases.afterGc.heapSnapshot = null;
+		}
+	}
+
+	expect(() => renderMemoryReportMarkdown(base, head, {
+		baseHeapSnapshotUrl: 'https://example.invalid/base',
+		headHeapSnapshotUrl: 'https://example.invalid/head',
+	})).toThrow('At least two samples per side are required');
+});
+
+test('reports the difference of medians and leaves a paired-looking PSS delta uncoloured', async () => {
+	const base = replacePssSamples(await loadFixture('base'), [290_000, 292_900, 295_800, 298_700, 301_600]);
+	const head = replacePssSamples(await loadFixture('head'), [292_900, 296_300, 298_700, 301_600, 290_000]);
+
+	expect(pairedDeltaSummary(
+		base.samples,
+		head.samples,
+		sample => sample.phases.afterGc.memoryUsage.Pss,
+	).median).toBe(2_900);
+
+	const markdown = renderMemoryReportMarkdown(base, head, {
+		baseHeapSnapshotUrl: 'https://example.invalid/base',
+		headHeapSnapshotUrl: 'https://example.invalid/head',
+	});
+	const row = findMetricRow(markdown, 'PSS');
+
+	expect(row).toContain('295.8 MB <br> ± 2.9 MB');
+	expect(row).toContain('296.3 MB <br> ± 3.4 MB');
+	expect(row).toContain('$\\text{+0.5 MB}$');
+	expect(row).toContain('4.5 MB');
+	expect(row.split('|')).toHaveLength(7);
+	expect(row).not.toMatch(/within noise|increase|decrease|inconclusive/);
+	expect(row).not.toContain('\\color{orange}');
+	expect(findMetricRow(markdown, 'USS')).not.toContain('\\color{orange}');
+});
+
+test('keeps the convergence warning without suppressing table colour or the PSS warning', async () => {
+	const base = await loadFixture('base');
+	const head = await loadFixture('head');
+	base.samples[0].phases.afterGc.memoryStability.converged = false;
+
+	const markdown = renderMemoryReportMarkdown(base, head, {
+		baseHeapSnapshotUrl: 'https://example.invalid/base',
+		headHeapSnapshotUrl: 'https://example.invalid/head',
+	});
+	const memorySection = markdown.slice(0, markdown.indexOf('### V8 Heap Snapshot Statistics'));
+
+	expect(memorySection).not.toContain('inconclusive');
+	expect(findMetricRow(markdown, 'PSS')).toContain('\\color{orange}');
+	expect(markdown).toContain('⚠️ **Measurement warning**: 1 memory sample did not converge.');
+	expect(markdown).not.toContain('results are marked inconclusive');
+	expect(markdown).toContain('⚠️ **Warning**: Memory usage (PSS)');
+});
+
+test('throws for an undersampled memory comparison', async () => {
+	const base = await loadFixture('base');
+	const head = await loadFixture('head');
+	base.samples = base.samples.slice(0, 1);
+	head.samples = head.samples.slice(0, 1);
+
+	expect(() => renderMemoryReportMarkdown(base, head, {
+		baseHeapSnapshotUrl: 'https://example.invalid/base',
+		headHeapSnapshotUrl: 'https://example.invalid/head',
+	})).toThrow('At least two samples per side are required');
+});
+
+test('renders an unavailable percentage when the base median is zero', async () => {
+	const base = await loadFixture('base');
+	const head = await loadFixture('head');
+	for (const sample of base.samples) sample.phases.afterGc.memoryUsage.External = 0;
+
+	const markdown = renderMemoryReportMarkdown(base, head, {
+		baseHeapSnapshotUrl: 'https://example.invalid/base',
+		headHeapSnapshotUrl: 'https://example.invalid/head',
+	});
+
+	expect(findMetricRow(markdown, 'External')).toContain('<br>-');
+	expect(markdown).toContain('| Metric | @&nbsp;Base | @&nbsp;Head | Δ | MAD |');
+	expect(markdown).not.toContain('| Metric | @&nbsp;Base | @&nbsp;Head | Δ | MAD | Result |');
+});

packages-private/diagnostics-backend/test/server.test.ts

@@ -0,0 +1,77 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { EventEmitter } from 'node:events';
+import type { ChildProcess } from 'node:child_process';
+import { describe, expect, test } from 'vitest';
+import { waitForMessage } from '../src/measure/server';
+
+/** waitForMessage が使うのは message/exit/error/disconnect の購読だけなので EventEmitter で足りる */
+function createFakeServer() {
+	return new EventEmitter() as unknown as ChildProcess;
+}
+
+function isPing(message: unknown): message is 'ping' {
+	return message === 'ping';
+}
+
+describe('waitForMessage', () => {
+	test('resolves with the first matching message', async () => {
+		const server = createFakeServer();
+		const received = waitForMessage(server, isPing, 'ping', 1_000);
+
+		server.emit('message', 'noise');
+		server.emit('message', 'ping');
+
+		await expect(received).resolves.toBe('ping');
+	});
+
+	// 子が死んだあとメッセージは来ないので、タイムアウトまで待たずに理由を添えて失敗させる
+	test('rejects immediately when the server exits', async () => {
+		const server = createFakeServer();
+		const received = waitForMessage(server, isPing, 'ping', 60_000);
+
+		server.emit('exit', 1, null);
+
+		await expect(received).rejects.toThrow(/Server exited \(code=1, signal=null\) while waiting for ping/);
+	});
+
+	test('rejects immediately when the server errors', async () => {
+		const server = createFakeServer();
+		const received = waitForMessage(server, isPing, 'ping', 60_000);
+
+		server.emit('error', new Error('spawn failed'));
+
+		await expect(received).rejects.toThrow(/spawn failed/);
+	});
+
+	test('rejects immediately when the IPC channel closes', async () => {
+		const server = createFakeServer();
+		const received = waitForMessage(server, isPing, 'ping', 60_000);
+
+		server.emit('disconnect');
+
+		await expect(received).rejects.toThrow(/IPC channel closed/);
+	});
+
+	test('rejects on timeout', async () => {
+		const server = createFakeServer();
+		await expect(waitForMessage(server, isPing, 'ping', 1)).rejects.toThrow(/Timed out waiting for ping/);
+	});
+
+	// 待機が終わった後もリスナーが残っていると、ラウンドを重ねるごとに積み上がる
+	test('removes every listener once settled', async () => {
+		const server = createFakeServer();
+		const emitter = server as unknown as EventEmitter;
+		const received = waitForMessage(server, isPing, 'ping', 1_000);
+
+		server.emit('message', 'ping');
+		await received;
+
+		for (const event of ['message', 'exit', 'error', 'disconnect']) {
+			expect(emitter.listenerCount(event)).toBe(0);
+		}
+	});
+});

packages-private/diagnostics-backend/test/stability.test.ts

@@ -0,0 +1,109 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { expect, test } from 'vitest';
+import { measureMemoryUntilStable } from '../src/measure/stability';
+
+function createTimer() {
+	let elapsedMs = 0;
+
+	return {
+		now: () => elapsedMs,
+		wait: async (durationMs: number) => {
+			elapsedMs += durationMs;
+		},
+	};
+}
+
+async function measure(readings: Record<string, number>[]) {
+	let readCount = 0;
+	const result = await measureMemoryUntilStable(
+		async () => readings[readCount++],
+		createTimer(),
+	);
+	return { result, readCount };
+}
+
+test('adopts the latest reading once Pss and Private_Dirty slopes converge', async () => {
+	const readings = [
+		{ Pss: 1000, Private_Dirty: 500, HeapUsed: 300 },
+		{ Pss: 1100, Private_Dirty: 520, HeapUsed: 310 },
+		{ Pss: 1200, Private_Dirty: 540, HeapUsed: 320 },
+	];
+	const { result, readCount } = await measure(readings);
+
+	expect(readCount).toBe(3);
+	expect(result.memoryUsage).toStrictEqual(readings[2]);
+	expect(result.stability).toStrictEqual({
+		converged: true,
+		readingCount: 3,
+		elapsedMs: 4000,
+		maxAbsoluteSlopesKiBPerSecond: {
+			Pss: 50,
+			Private_Dirty: 10,
+		},
+	});
+});
+
+test('uses only the latest readings when determining convergence', async () => {
+	const readings = [
+		{ Pss: 1000, Private_Dirty: 500 },
+		{ Pss: 2000, Private_Dirty: 1000 },
+		{ Pss: 3000, Private_Dirty: 1500 },
+		{ Pss: 3040, Private_Dirty: 1520 },
+		{ Pss: 3080, Private_Dirty: 1540 },
+	];
+	const { result, readCount } = await measure(readings);
+
+	expect(readCount).toBe(5);
+	expect(result.stability.converged).toBe(true);
+	expect(result.stability.maxAbsoluteSlopesKiBPerSecond).toStrictEqual({
+		Pss: 20,
+		Private_Dirty: 10,
+	});
+});
+
+test('bounds the wait and reports the latest slopes when memory does not converge', async () => {
+	const readings = [
+		{ Pss: 1000, Private_Dirty: 500 },
+		{ Pss: 1600, Private_Dirty: 520 },
+		{ Pss: 2200, Private_Dirty: 540 },
+		{ Pss: 2800, Private_Dirty: 560 },
+		{ Pss: 3400, Private_Dirty: 580 },
+		{ Pss: 4000, Private_Dirty: 600 },
+	];
+	const { result, readCount } = await measure(readings);
+
+	expect(readCount).toBe(6);
+	expect(result.memoryUsage).toStrictEqual(readings[5]);
+	expect(result.stability).toStrictEqual({
+		converged: false,
+		readingCount: 6,
+		elapsedMs: 10000,
+		maxAbsoluteSlopesKiBPerSecond: {
+			Pss: 300,
+			Private_Dirty: 10,
+		},
+	});
+});
+
+test('does not treat opposing adjacent slopes as convergence', async () => {
+	const readings = [
+		{ Pss: 1000, Private_Dirty: 500 },
+		{ Pss: 1600, Private_Dirty: 500 },
+		{ Pss: 1000, Private_Dirty: 500 },
+		{ Pss: 1600, Private_Dirty: 500 },
+		{ Pss: 1000, Private_Dirty: 500 },
+		{ Pss: 1600, Private_Dirty: 500 },
+	];
+	const { result, readCount } = await measure(readings);
+
+	expect(readCount).toBe(6);
+	expect(result.stability.converged).toBe(false);
+	expect(result.stability.maxAbsoluteSlopesKiBPerSecond).toStrictEqual({
+		Pss: 300,
+		Private_Dirty: 0,
+	});
+});

packages-private/diagnostics-backend/tsconfig.json

@@ -0,0 +1,20 @@
+{
+	"$schema": "https://json.schemastore.org/tsconfig",
+	"compilerOptions": {
+		"target": "ESNext",
+		"module": "ESNext",
+		"moduleResolution": "bundler",
+		"strict": true,
+		"strictFunctionTypes": true,
+		"strictNullChecks": true,
+		"esModuleInterop": true,
+		"skipLibCheck": true,
+		"noEmit": true,
+		"types": ["node"]
+	},
+	"include": [
+		"src/**/*.ts",
+		"test/**/*.ts"
+	],
+	"exclude": []
+}

packages-private/diagnostics-frontend/eslint.config.js

@@ -0,0 +1,25 @@
+import tsParser from '@typescript-eslint/parser';
+import sharedConfig from '../../packages/shared/eslint.config.js';
+
+// eslint-disable-next-line import/no-default-export
+export default [
+	...sharedConfig,
+	{
+		ignores: [
+			'**/node_modules',
+			'**/__snapshots__',
+			'test/fixtures',
+		],
+	},
+	{
+		files: ['**/*.ts', '**/*.tsx'],
+		languageOptions: {
+			parserOptions: {
+				parser: tsParser,
+				project: ['./tsconfig.json'],
+				sourceType: 'module',
+				tsconfigRootDir: import.meta.dirname,
+			},
+		},
+	},
+];

packages-private/diagnostics-frontend/package.json

@@ -0,0 +1,25 @@
+{
+	"name": "diagnostics-frontend",
+	"private": true,
+	"type": "module",
+	"scripts": {
+		"eslint": "eslint './**/*.{js,jsx,ts,tsx}'",
+		"inspect-browser": "tsx src/inspect-browser.ts",
+		"lint": "pnpm typecheck && pnpm eslint",
+		"render-browser-html": "tsx src/render-browser-html.ts",
+		"render-md": "tsx src/render-md.ts",
+		"test": "vitest run",
+		"typecheck": "tsc --noEmit"
+	},
+	"dependencies": {
+		"diagnostics-shared": "workspace:*"
+	},
+	"devDependencies": {
+		"@types/node": "26.1.1",
+		"frontend": "workspace:*",
+		"playwright": "1.61.1",
+		"tsx": "4.23.1",
+		"typescript": "5.9.3",
+		"vitest": "4.1.10"
+	}
+}

packages-private/diagnostics-frontend/src/browser/controller.ts

@@ -0,0 +1,211 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { writeFile } from 'node:fs/promises';
+import { chromium } from 'playwright';
+import { enableNetworkTracking, type NetworkTracker } from './network';
+import type { Browser, BrowserContext, CDPSession, Page } from 'playwright';
+import type { BrowserDiagnostics, BrowserMeasurement, NetworkRequest, TabMemory, WebSocketConnection } from './types';
+
+export type HeadlessChromeOptions = {
+	scenarioTimeoutMs: number;
+	baseUrl: string;
+};
+
+export class HeadlessChromeController {
+	private readonly diagnostics = {
+		pageErrorCount: 0,
+		console: {} as Record<string, number | undefined>,
+	};
+	private readonly browser: Browser;
+	private readonly context: BrowserContext;
+	public readonly page: Page;
+	private readonly cdp: CDPSession;
+	private networkTracker: NetworkTracker | null = null;
+
+	private constructor(
+		browser: Browser,
+		context: BrowserContext,
+		page: Page,
+		cdp: CDPSession,
+		options: HeadlessChromeOptions,
+	) {
+		this.browser = browser;
+		this.context = context;
+		this.page = page;
+		this.cdp = cdp;
+		this.page.setDefaultTimeout(options.scenarioTimeoutMs);
+		this.page.setDefaultNavigationTimeout(options.scenarioTimeoutMs);
+		this.page.on('pageerror', () => {
+			this.diagnostics.pageErrorCount++;
+		});
+		this.page.on('console', message => {
+			const type = message.type();
+			this.diagnostics.console[type] = (this.diagnostics.console[type] ?? 0) + 1;
+		});
+	}
+
+	public get networkRequests(): NetworkRequest[] {
+		return this.networkTracker?.networkRequests ?? [];
+	}
+
+	public get webSocketConnections(): WebSocketConnection[] {
+		return this.networkTracker?.webSocketConnections ?? [];
+	}
+
+	static async create(label: string, options: HeadlessChromeOptions): Promise<HeadlessChromeController> {
+		process.stderr.write(`[${label}] Launching Playwright Chromium\n`);
+		const browser = await chromium.launch({
+			channel: 'chromium',
+			headless: true,
+			args: [
+				'--disable-gpu',
+				'--disable-dev-shm-usage',
+				'--disable-background-networking',
+				'--disable-default-apps',
+				'--disable-extensions',
+				'--disable-sync',
+				'--metrics-recording-only',
+				'--no-first-run',
+				'--no-default-browser-check',
+				'--no-sandbox',
+			],
+		});
+
+		try {
+			const context = await browser.newContext({
+				baseURL: options.baseUrl,
+				locale: 'en-US',
+			});
+			await context.addInitScript(() => {
+				// @ts-expect-error Test-only runtime hint consumed by Misskey frontend code.
+				window.isPlaywright = true;
+			});
+
+			const page = await context.newPage();
+			const cdp = await context.newCDPSession(page);
+			return new HeadlessChromeController(browser, context, page, cdp, options);
+		} catch (error) {
+			await browser.close().catch(() => undefined);
+			throw error;
+		}
+	}
+
+	static async with<T>(label: string, options: HeadlessChromeOptions, callback: (browser: HeadlessChromeController) => T | Promise<T>): Promise<T> {
+		const browser = await HeadlessChromeController.create(label, options);
+		try {
+			return await callback(browser);
+		} finally {
+			await browser.close();
+		}
+	}
+
+	public async enableNetworkTracking() {
+		this.networkTracker = await enableNetworkTracking(this.cdp);
+	}
+
+	public async waitForNetworkDetails() {
+		await this.networkTracker?.waitForDetails();
+	}
+
+	public async evaluate<T>(expression: string, timeoutMs = 30_000): Promise<T> {
+		return await Promise.race([
+			this.page.evaluate(expression),
+			new Promise<never>((_, reject) => setTimeout(() => reject(new Error(`Playwright evaluate timed out after ${timeoutMs}ms`)), timeoutMs).unref()),
+		]) as T;
+	}
+
+	public collectDiagnostics(): BrowserDiagnostics {
+		return {
+			pageErrorCount: this.diagnostics.pageErrorCount,
+			console: {
+				log: this.diagnostics.console.log ?? 0,
+				warning: this.diagnostics.console.warning ?? 0,
+				error: this.diagnostics.console.error ?? 0,
+				info: this.diagnostics.console.info ?? 0,
+			},
+		};
+	}
+
+	public async collectPerformance(): Promise<BrowserMeasurement['performance']> {
+		const cdpMetricsResult = await this.cdp.send('Performance.getMetrics');
+		const cdpMetrics = Object.fromEntries(cdpMetricsResult.metrics.map(metric => [metric.name, metric.value]));
+		const runtimeHeap = await this.cdp.send('Runtime.getHeapUsage').catch(() => undefined);
+		const tabMemory = await this.collectTabMemory();
+		const webVitals = await this.evaluate<BrowserMeasurement['performance']['webVitals']>(`(() => {
+			const navigation = performance.getEntriesByType('navigation')[0];
+			const paintEntries = Object.fromEntries(performance.getEntriesByType('paint').map(entry => [entry.name, entry.startTime]));
+			const longTasks = performance.getEntriesByType('longtask');
+			const resourceEntries = performance.getEntriesByType('resource');
+			return {
+				firstPaintMs: paintEntries['first-paint'],
+				firstContentfulPaintMs: paintEntries['first-contentful-paint'],
+				domContentLoadedEventEndMs: navigation?.domContentLoadedEventEnd,
+				loadEventEndMs: navigation?.loadEventEnd,
+				longTaskCount: longTasks.length,
+				longTaskDurationMs: longTasks.reduce((sum, entry) => sum + entry.duration, 0),
+				maxLongTaskDurationMs: longTasks.reduce((max, entry) => Math.max(max, entry.duration), 0),
+				resourceEntryCount: resourceEntries.length,
+				domElements: document.getElementsByTagName('*').length,
+			};
+		})()`);
+
+		return {
+			cdpMetrics,
+			runtimeHeap,
+			tabMemory,
+			webVitals,
+		};
+	}
+
+	public async collectTabMemory(): Promise<TabMemory> {
+		const userAgentSpecificMemory = await this.evaluate<{ bytes?: number }>(`(async () => {
+			const measureMemory = performance.measureUserAgentSpecificMemory;
+			if (typeof measureMemory !== 'function') return {};
+			const result = await measureMemory.call(performance);
+			return { bytes: result.bytes };
+		})()`, 60_000);
+
+		const userAgentSpecificBytes = userAgentSpecificMemory?.bytes;
+		if (!Number.isFinite(userAgentSpecificBytes)) {
+			throw new Error('performance.measureUserAgentSpecificMemory() did not return finite bytes');
+		}
+
+		return {
+			totalBytes: userAgentSpecificBytes as number,
+		};
+	}
+
+	public async takeHeapSnapshot(savePath?: string) {
+		const chunks: string[] = [];
+		const onChunk = (params: { chunk: string }) => {
+			chunks.push(params.chunk);
+		};
+		this.cdp.on('HeapProfiler.addHeapSnapshotChunk', onChunk);
+
+		let content: string;
+		try {
+			await this.cdp.send('HeapProfiler.enable');
+			await this.cdp.send('HeapProfiler.collectGarbage');
+			await this.cdp.send('HeapProfiler.takeHeapSnapshot', { reportProgress: false });
+			content = chunks.join('');
+		} finally {
+			// 外さないとラウンドごとに積み上がり、古い配列にチャンクを流し続ける
+			this.cdp.off('HeapProfiler.addHeapSnapshotChunk', onChunk);
+		}
+
+		if (savePath != null) {
+			await writeFile(savePath, content);
+		}
+
+		return JSON.parse(content);
+	}
+
+	public async close() {
+		await this.cdp.detach().catch(() => undefined);
+		await this.context.close().catch(() => undefined);
+		await this.browser.close().catch(() => undefined);
+	}
+}

packages-private/diagnostics-frontend/src/browser/diagnostics.ts

@@ -0,0 +1,21 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { median } from 'diagnostics-shared/stats';
+import type { BrowserDiagnostics } from './types';
+
+export function summarizeBrowserDiagnostics(samples: BrowserDiagnostics[]): BrowserDiagnostics {
+	const medianOf = (select: (sample: BrowserDiagnostics) => number) => median(samples.map(select));
+
+	return {
+		pageErrorCount: medianOf(sample => sample.pageErrorCount),
+		console: {
+			log: medianOf(sample => sample.console.log),
+			warning: medianOf(sample => sample.console.warning),
+			error: medianOf(sample => sample.console.error),
+			info: medianOf(sample => sample.console.info),
+		},
+	};
+}

packages-private/diagnostics-frontend/src/browser/network.ts

@@ -0,0 +1,265 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import type { CDPSession } from 'playwright';
+import type { NetworkRequest, NetworkSummary, WebSocketConnection } from './types';
+
+function normalizeHeaders(headers: Record<string, unknown> | undefined) {
+	if (headers == null) return undefined;
+	const normalized = {} as Record<string, string>;
+	for (const [key, value] of Object.entries(headers)) {
+		normalized[key] = String(value);
+	}
+	return normalized;
+}
+
+function webSocketFramePayloadBytes(frame: { opcode?: number; payloadData?: string } | undefined) {
+	if (frame?.payloadData == null) return 0;
+	// opcode 1 はテキストフレームで、それ以外はbase64エンコードされたバイナリとして届く
+	if (frame.opcode === 1) return Buffer.byteLength(frame.payloadData, 'utf8');
+	return Buffer.byteLength(frame.payloadData, 'base64');
+}
+
+export type NetworkTracker = {
+	networkRequests: NetworkRequest[];
+	webSocketConnections: WebSocketConnection[];
+	/** CDPへの追加問い合わせ (postDataの取得) が全て決着するまで待つ */
+	waitForDetails: () => Promise<void>;
+};
+
+/**
+ * CDPのNetworkドメインを有効化し、リクエスト/WebSocketの生ログを収集し続けるトラッカーを返す。
+ */
+export async function enableNetworkTracking(cdp: CDPSession): Promise<NetworkTracker> {
+	const networkRequests: NetworkRequest[] = [];
+	const webSocketConnections: WebSocketConnection[] = [];
+	const requests = new Map<string, NetworkRequest>();
+	const webSockets = new Map<string, WebSocketConnection>();
+	const pendingDetailReads: Promise<void>[] = [];
+
+	const readRequestBody = (row: NetworkRequest) => {
+		if (!row.hasRequestBody || row.requestBody != null) return;
+		const pending = cdp.send('Network.getRequestPostData', {
+			requestId: row.requestId,
+		}).then(result => {
+			row.requestBody = result.postData;
+		}).catch(() => {
+			// Some requests expose hasPostData but no longer have retrievable body data.
+		});
+		pendingDetailReads.push(pending);
+	};
+
+	cdp.on('Network.requestWillBeSent', params => {
+		if (params.request?.url == null) return;
+		const row: NetworkRequest = {
+			requestId: params.requestId,
+			url: params.request.url,
+			method: params.request.method ?? 'GET',
+			resourceType: params.type ?? 'Other',
+			startedAt: params.timestamp ?? 0,
+			documentUrl: params.documentURL,
+			requestHeaders: normalizeHeaders(params.request.headers),
+			requestBody: typeof params.request.postData === 'string' ? params.request.postData : undefined,
+			hasRequestBody: params.request.hasPostData === true || typeof params.request.postData === 'string',
+			encodedDataLength: 0,
+			decodedBodyLength: 0,
+			fromDiskCache: false,
+			fromServiceWorker: false,
+			finished: false,
+			failed: false,
+		};
+		requests.set(params.requestId, row);
+		networkRequests.push(row);
+	});
+
+	cdp.on('Network.webSocketCreated', params => {
+		if (params.requestId == null || params.url == null) return;
+		const row: WebSocketConnection = {
+			requestId: params.requestId,
+			url: params.url,
+			// Network.webSocketCreated はtimestampを持たないので、closedAt との差分は取れない
+			createdAt: 0,
+			sentFrameCount: 0,
+			receivedFrameCount: 0,
+			sentBytes: 0,
+			receivedBytes: 0,
+			errorCount: 0,
+		};
+		webSockets.set(params.requestId, row);
+		webSocketConnections.push(row);
+	});
+
+	cdp.on('Network.webSocketWillSendHandshakeRequest', params => {
+		const row = webSockets.get(params.requestId);
+		if (row == null) return;
+		row.handshakeRequestHeaders = normalizeHeaders(params.request?.headers);
+	});
+
+	cdp.on('Network.webSocketHandshakeResponseReceived', params => {
+		const row = webSockets.get(params.requestId);
+		if (row == null) return;
+		row.handshakeResponseStatus = params.response?.status;
+		row.handshakeResponseStatusText = params.response?.statusText;
+		row.handshakeResponseHeaders = normalizeHeaders(params.response?.headers);
+	});
+
+	cdp.on('Network.webSocketFrameSent', params => {
+		const row = webSockets.get(params.requestId);
+		if (row == null) return;
+		row.sentFrameCount += 1;
+		row.sentBytes += webSocketFramePayloadBytes(params.response);
+	});
+
+	cdp.on('Network.webSocketFrameReceived', params => {
+		const row = webSockets.get(params.requestId);
+		if (row == null) return;
+		row.receivedFrameCount += 1;
+		row.receivedBytes += webSocketFramePayloadBytes(params.response);
+	});
+
+	cdp.on('Network.webSocketFrameError', params => {
+		const row = webSockets.get(params.requestId);
+		if (row == null) return;
+		row.errorCount += 1;
+	});
+
+	cdp.on('Network.webSocketClosed', params => {
+		const row = webSockets.get(params.requestId);
+		if (row == null) return;
+		row.closedAt = params.timestamp ?? 0;
+	});
+
+	cdp.on('Network.responseReceived', params => {
+		const row = requests.get(params.requestId);
+		if (row == null) return;
+		row.status = params.response?.status;
+		row.statusText = params.response?.statusText;
+		row.mimeType = params.response?.mimeType;
+		row.responseHeaders = normalizeHeaders(params.response?.headers);
+		row.protocol = params.response?.protocol;
+		row.remoteIPAddress = params.response?.remoteIPAddress;
+		row.remotePort = params.response?.remotePort;
+		row.requestHeaders ??= normalizeHeaders(params.response?.requestHeaders);
+		row.fromDiskCache = params.response?.fromDiskCache === true;
+		row.fromServiceWorker = params.response?.fromServiceWorker === true;
+	});
+
+	cdp.on('Network.dataReceived', params => {
+		const row = requests.get(params.requestId);
+		if (row == null) return;
+		row.decodedBodyLength += params.dataLength ?? 0;
+		row.encodedDataLength += params.encodedDataLength ?? 0;
+	});
+
+	cdp.on('Network.loadingFinished', params => {
+		const row = requests.get(params.requestId);
+		if (row == null) return;
+		row.finished = true;
+		row.encodedDataLength = Math.max(row.encodedDataLength, params.encodedDataLength ?? 0);
+		readRequestBody(row);
+	});
+
+	cdp.on('Network.loadingFailed', params => {
+		const row = requests.get(params.requestId);
+		if (row == null) return;
+		row.failed = true;
+		row.finished = true;
+		row.errorText = params.errorText;
+		readRequestBody(row);
+	});
+
+	await cdp.send('Network.enable');
+	await cdp.send('Network.setCacheDisabled', { cacheDisabled: true });
+	await cdp.send('Network.setBypassServiceWorker', { bypass: true });
+	await cdp.send('Page.enable');
+	await cdp.send('Runtime.enable');
+	await cdp.send('Performance.enable');
+
+	return {
+		networkRequests,
+		webSocketConnections,
+		waitForDetails: async () => {
+			// 待っている最中にさらにpendingが増えることがあるので、増えなくなるまで繰り返す
+			let settledCount = 0;
+			while (settledCount < pendingDetailReads.length) {
+				const pending = pendingDetailReads.slice(settledCount);
+				settledCount = pendingDetailReads.length;
+				await Promise.allSettled(pending);
+			}
+		},
+	};
+}
+
+function isMeasurableRequest(row: NetworkRequest) {
+	return !row.url.startsWith('data:') && !row.url.startsWith('blob:') && !row.url.startsWith('devtools:');
+}
+
+export function summarizeNetwork(requestRows: NetworkRequest[], baseUrl: string, webSocketRows?: WebSocketConnection[]): NetworkSummary {
+	const origin = new URL(baseUrl).origin;
+	const rows = requestRows.filter(isMeasurableRequest);
+	const byResourceType = {} as NetworkSummary['byResourceType'];
+
+	for (const row of rows) {
+		const summary = byResourceType[row.resourceType] ?? {
+			requests: 0,
+			encodedBytes: 0,
+			decodedBodyBytes: 0,
+		};
+		summary.requests += 1;
+		summary.encodedBytes += row.encodedDataLength;
+		summary.decodedBodyBytes += row.decodedBodyLength;
+		byResourceType[row.resourceType] = summary;
+	}
+
+	function isSameOrigin(url: string) {
+		try {
+			return new URL(url).origin === origin;
+		} catch {
+			return false;
+		}
+	}
+
+	return {
+		requestCount: rows.length,
+		webSocketConnectionCount: webSocketRows == null
+			? rows.filter(row => row.resourceType === 'WebSocket').length
+			: webSocketRows.length,
+		webSocketSentBytes: webSocketRows?.reduce((sum, row) => sum + row.sentBytes, 0) ?? 0,
+		webSocketReceivedBytes: webSocketRows?.reduce((sum, row) => sum + row.receivedBytes, 0) ?? 0,
+		finishedRequestCount: rows.filter(row => row.finished).length,
+		failedRequestCount: rows.filter(row => row.failed).length,
+		cachedRequestCount: rows.filter(row => row.fromDiskCache).length,
+		serviceWorkerRequestCount: rows.filter(row => row.fromServiceWorker).length,
+		totalEncodedBytes: rows.reduce((sum, row) => sum + row.encodedDataLength, 0),
+		totalDecodedBodyBytes: rows.reduce((sum, row) => sum + row.decodedBodyLength, 0),
+		sameOriginEncodedBytes: rows
+			.filter(row => isSameOrigin(row.url))
+			.reduce((sum, row) => sum + row.encodedDataLength, 0),
+		thirdPartyEncodedBytes: rows
+			.filter(row => !isSameOrigin(row.url))
+			.reduce((sum, row) => sum + row.encodedDataLength, 0),
+		byResourceType,
+		largestRequests: rows
+			.toSorted((a, b) => b.encodedDataLength - a.encodedDataLength)
+			.slice(0, 15)
+			.map(row => ({
+				url: row.url,
+				method: row.method,
+				resourceType: row.resourceType,
+				status: row.status,
+				encodedBytes: row.encodedDataLength,
+				decodedBodyBytes: row.decodedBodyLength,
+			})),
+		failedRequests: rows
+			.filter(row => row.failed)
+			.map(row => ({
+				url: row.url,
+				method: row.method,
+				resourceType: row.resourceType,
+				errorText: row.errorText,
+				status: row.status,
+			})),
+	};
+}

packages-private/diagnostics-frontend/src/browser/report/html-styles.ts

@@ -0,0 +1,177 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/** 差分HTMLは単体のファイルとして配布されるので、CSSも埋め込みで持つ */
+export const networkDiffHtmlStyles = `		:root {
+			color-scheme: light dark;
+			--bg: #f7f7f8;
+			--fg: #202124;
+			--muted: #5f6368;
+			--card: #ffffff;
+			--border: #dfe1e5;
+			--added: #137333;
+			--added-bg: #e6f4ea;
+			--removed: #a50e0e;
+			--removed-bg: #fce8e6;
+		}
+		@media (prefers-color-scheme: dark) {
+			:root {
+				--bg: #111315;
+				--fg: #e8eaed;
+				--muted: #bdc1c6;
+				--card: #1b1d20;
+				--border: #3c4043;
+				--added-bg: #17351f;
+				--removed-bg: #3c1f1d;
+			}
+		}
+		body {
+			margin: 0;
+			font: 14px/1.5 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+			background: var(--bg);
+			color: var(--fg);
+		}
+		main {
+			max-width: 1200px;
+			margin: 0 auto;
+			padding: 24px;
+		}
+		h1 {
+			font-size: 24px;
+			margin: 0 0 8px;
+		}
+		h2 {
+			font-size: 18px;
+			margin: 32px 0 8px;
+		}
+		.meta {
+			color: var(--muted);
+			margin: 0 0 24px;
+		}
+		.summary {
+			display: grid;
+			grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
+			gap: 12px;
+			margin: 24px 0;
+		}
+		.summary > div, .request, table {
+			background: var(--card);
+			border: 1px solid var(--border);
+			border-radius: 8px;
+		}
+		.summary > div {
+			padding: 14px;
+		}
+		.label {
+			display: block;
+			color: var(--muted);
+			font-size: 12px;
+		}
+		.summary strong {
+			display: block;
+			font-size: 24px;
+			margin-top: 4px;
+		}
+		.added-text {
+			color: var(--added);
+		}
+		.removed-text {
+			color: var(--removed);
+		}
+		table {
+			border-collapse: collapse;
+			width: 100%;
+			overflow: hidden;
+		}
+		th, td {
+			border-bottom: 1px solid var(--border);
+			padding: 8px 10px;
+			text-align: left;
+		}
+		th {
+			color: var(--muted);
+			font-weight: 600;
+		}
+		.num {
+			text-align: right;
+		}
+		.requests {
+			display: grid;
+			gap: 12px;
+		}
+		.request {
+			padding: 14px;
+			overflow-wrap: anywhere;
+		}
+		.request.added {
+			border-left: 4px solid var(--added);
+		}
+		.request.removed {
+			border-left: 4px solid var(--removed);
+		}
+		.request header {
+			display: flex;
+			flex-wrap: wrap;
+			gap: 8px;
+			align-items: center;
+			margin-bottom: 8px;
+		}
+		.badge, .method, .type, .status {
+			border-radius: 999px;
+			padding: 2px 8px;
+			font-size: 12px;
+			font-weight: 600;
+		}
+		.added .badge {
+			background: var(--added-bg);
+			color: var(--added);
+		}
+		.removed .badge {
+			background: var(--removed-bg);
+			color: var(--removed);
+		}
+		.method, .type, .status {
+			background: color-mix(in srgb, var(--muted) 14%, transparent);
+			color: var(--fg);
+		}
+		.url {
+			display: block;
+			margin: 8px 0 12px;
+			color: inherit;
+			font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
+		}
+		dl {
+			display: grid;
+			grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
+			gap: 8px 16px;
+			margin: 0 0 12px;
+		}
+		dl div {
+			min-width: 0;
+		}
+		dt {
+			color: var(--muted);
+			font-size: 12px;
+		}
+		dd {
+			margin: 0;
+		}
+		details {
+			margin-top: 8px;
+		}
+		summary {
+			cursor: pointer;
+			color: var(--muted);
+		}
+		pre {
+			white-space: pre-wrap;
+			overflow-x: auto;
+			background: color-mix(in srgb, var(--muted) 10%, transparent);
+			border-radius: 6px;
+			padding: 10px;
+		}
+		.empty {
+			color: var(--muted);
+		}`;

packages-private/diagnostics-frontend/src/browser/report/html.ts

@@ -0,0 +1,255 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { formatBytes, formatNumber } from 'diagnostics-shared/format';
+import { type Raw, html, joinHtml, raw } from 'diagnostics-shared/html';
+import { networkDiffHtmlStyles } from './html-styles';
+import type { BrowserMeasurementSample, BrowserMetricsReport, NetworkRequest } from '../types';
+
+type DiffDirection = 'added' | 'removed';
+
+type RequestDiff = {
+	direction: DiffDirection;
+	round: number;
+	baseCount: number;
+	headCount: number;
+	request: NetworkRequest;
+};
+
+function isHttpRequest(request: NetworkRequest) {
+	try {
+		const { protocol } = new URL(request.url);
+		return protocol === 'http:' || protocol === 'https:';
+	} catch {
+		return false;
+	}
+}
+
+function requestKey(request: NetworkRequest) {
+	// URLに現れない文字で区切らないと、区切り文字を含むURLが別のキーと衝突しうる
+	return [
+		request.method,
+		request.resourceType,
+		request.url,
+	].join('\u0000');
+}
+
+function groupRequests(requests: NetworkRequest[] | undefined) {
+	const grouped = new Map<string, NetworkRequest[]>();
+	for (const request of requests ?? []) {
+		if (!isHttpRequest(request)) continue;
+		const key = requestKey(request);
+		const rows = grouped.get(key) ?? [];
+		rows.push(request);
+		grouped.set(key, rows);
+	}
+	return grouped;
+}
+
+function byRound(samples: BrowserMeasurementSample[]) {
+	return new Map(samples.map(sample => [sample.round, sample]));
+}
+
+/**
+ * 同じラウンドどうしで、同一 (method, resourceType, URL) のリクエスト本数を突き合わせる。
+ * 本数が増えていればhead側の増分を added、減っていればbase側の余りを removed として扱う。
+ */
+function diffRound(round: number, baseSample: BrowserMeasurementSample | undefined, headSample: BrowserMeasurementSample | undefined) {
+	const baseRequests = groupRequests(baseSample?.networkRequests);
+	const headRequests = groupRequests(headSample?.networkRequests);
+	const keys = [...new Set([
+		...baseRequests.keys(),
+		...headRequests.keys(),
+	])].toSorted();
+	const diffs: RequestDiff[] = [];
+
+	for (const key of keys) {
+		const baseRows = baseRequests.get(key) ?? [];
+		const headRows = headRequests.get(key) ?? [];
+		if (headRows.length > baseRows.length) {
+			for (const request of headRows.slice(baseRows.length)) {
+				diffs.push({
+					direction: 'added',
+					round,
+					baseCount: baseRows.length,
+					headCount: headRows.length,
+					request,
+				});
+			}
+		} else if (baseRows.length > headRows.length) {
+			for (const request of baseRows.slice(headRows.length)) {
+				diffs.push({
+					direction: 'removed',
+					round,
+					baseCount: baseRows.length,
+					headCount: headRows.length,
+					request,
+				});
+			}
+		}
+	}
+
+	return diffs;
+}
+
+function diffReports(base: BrowserMetricsReport, head: BrowserMetricsReport) {
+	const baseSamples = byRound(base.samples);
+	const headSamples = byRound(head.samples);
+	const rounds = [...new Set([
+		...baseSamples.keys(),
+		...headSamples.keys(),
+	])].toSorted((a, b) => a - b);
+	return rounds.flatMap(round => diffRound(round, baseSamples.get(round), headSamples.get(round)));
+}
+
+function formatMaybeJson(value: string | undefined) {
+	if (value == null || value === '') return null;
+	try {
+		return JSON.stringify(JSON.parse(value), null, '\t');
+	} catch {
+		return value;
+	}
+}
+
+function formatHeaders(headers: Record<string, string> | undefined) {
+	if (headers == null || Object.keys(headers).length === 0) return null;
+	return JSON.stringify(headers, null, '\t');
+}
+
+function countBy<T extends string>(diffs: RequestDiff[], getKey: (diff: RequestDiff) => T) {
+	const counts = new Map<T, number>();
+	for (const diff of diffs) {
+		counts.set(getKey(diff), (counts.get(getKey(diff)) ?? 0) + 1);
+	}
+	return [...counts].toSorted((a, b) => b[1] - a[1] || a[0].localeCompare(b[0]));
+}
+
+function renderSummary(base: BrowserMetricsReport, head: BrowserMetricsReport, diffs: RequestDiff[]): Raw {
+	const added = diffs.filter(diff => diff.direction === 'added').length;
+	const removed = diffs.filter(diff => diff.direction === 'removed').length;
+	const typeCounts = countBy(diffs, diff => diff.request.resourceType);
+	const typeRows = joinHtml(typeCounts.map(([type, count]) => html`
+				<tr>
+					<td>${type}</td>
+					<td class="num">${formatNumber(count)}</td>
+				</tr>`), '');
+
+	return html`
+		<section class="summary">
+			<div>
+				<span class="label">Base samples</span>
+				<strong>${formatNumber(base.sampleCount)}</strong>
+			</div>
+			<div>
+				<span class="label">Head samples</span>
+				<strong>${formatNumber(head.sampleCount)}</strong>
+			</div>
+			<div>
+				<span class="label">Added in Head</span>
+				<strong class="added-text">${formatNumber(added)}</strong>
+			</div>
+			<div>
+				<span class="label">Removed in Head</span>
+				<strong class="removed-text">${formatNumber(removed)}</strong>
+			</div>
+		</section>
+		${typeCounts.length === 0 ? raw('') : html`
+		<section>
+			<h2>Diffs by Resource Type</h2>
+			<table>
+				<thead><tr><th>Type</th><th>Diff requests</th></tr></thead>
+				<tbody>${typeRows}
+				</tbody>
+			</table>
+		</section>`}`;
+}
+
+function renderDetails(title: string, content: string | null, open = false): Raw {
+	if (content == null || content === '') return raw('');
+	return html`
+			<details${open ? raw(' open') : raw('')}>
+				<summary>${title}</summary>
+				<pre>${content}</pre>
+			</details>`;
+}
+
+function renderRequest(diff: RequestDiff): Raw {
+	const { request } = diff;
+	const requestBody = formatMaybeJson(request.requestBody);
+	const requestHeaders = formatHeaders(request.requestHeaders);
+	const responseHeaders = formatHeaders(request.responseHeaders);
+	const bodyNote = requestBody == null && request.hasRequestBody === true
+		? html`<p class="empty">Request body was present but could not be retrieved from CDP.</p>`
+		: raw('');
+
+	return html`
+		<article class="request ${diff.direction}">
+			<header>
+				<span class="badge">${diff.direction === 'added' ? 'Added in Head' : 'Removed in Head'}</span>
+				<span class="method">${request.method}</span>
+				<span class="type">${request.resourceType}</span>
+				<span class="status">${request.status ?? '-'}</span>
+			</header>
+			<a class="url" href="${request.url}">${request.url}</a>
+			<dl>
+				<div><dt>Round</dt><dd>${formatNumber(diff.round)}</dd></div>
+				<div><dt>Base count</dt><dd>${formatNumber(diff.baseCount)}</dd></div>
+				<div><dt>Head count</dt><dd>${formatNumber(diff.headCount)}</dd></div>
+				<div><dt>Encoded</dt><dd>${formatBytes(request.encodedDataLength ?? 0)}</dd></div>
+				<div><dt>Decoded body</dt><dd>${formatBytes(request.decodedBodyLength ?? 0)}</dd></div>
+				<div><dt>MIME</dt><dd>${request.mimeType ?? '-'}</dd></div>
+				<div><dt>Protocol</dt><dd>${request.protocol ?? '-'}</dd></div>
+				<div><dt>Remote</dt><dd>${request.remoteIPAddress == null ? '-' : `${request.remoteIPAddress}:${request.remotePort ?? ''}`}</dd></div>
+				<div><dt>Failed</dt><dd>${request.failed ? (request.errorText ?? 'yes') : 'no'}</dd></div>
+			</dl>
+			${bodyNote}
+			${renderDetails('Request body', requestBody, requestBody != null)}
+			${renderDetails('Request headers', requestHeaders)}
+			${renderDetails('Response headers', responseHeaders)}
+		</article>`;
+}
+
+function renderRound(round: number, diffs: RequestDiff[]): Raw {
+	const added = diffs.filter(diff => diff.direction === 'added').length;
+	const removed = diffs.filter(diff => diff.direction === 'removed').length;
+	return html`
+		<section>
+			<h2>Round ${formatNumber(round)}</h2>
+			<p>${formatNumber(added)} added, ${formatNumber(removed)} removed</p>
+			<div class="requests">
+				${joinHtml(diffs.map(renderRequest), '\n')}
+			</div>
+		</section>`;
+}
+
+export function renderBrowserDiagnosticsHtml(base: BrowserMetricsReport, head: BrowserMetricsReport) {
+	const diffs = diffReports(base, head);
+	const rounds = [...new Set(diffs.map(diff => diff.round))].toSorted((a, b) => a - b);
+	const generatedAt = new Date().toISOString();
+	const content = diffs.length === 0
+		? html`<section><p>No added or removed HTTP(S) requests were found in paired samples.</p></section>`
+		: joinHtml(rounds.map(round => renderRound(round, diffs.filter(diff => diff.round === round))), '\n');
+
+	return String(html`<!doctype html>
+<html lang="en">
+<head>
+	<meta charset="utf-8">
+	<meta name="viewport" content="width=device-width, initial-scale=1">
+	<title>Frontend Browser Network Request Diff</title>
+	<style>
+${raw(networkDiffHtmlStyles)}
+	</style>
+</head>
+<body>
+	<main>
+		<h1>Frontend Browser Network Request Diff</h1>
+		<p class="meta">Generated at ${generatedAt}. Requests are compared per paired round by method, resource type, and exact URL. Bodies are shown for added/removed request instances when CDP exposes them.</p>
+		${renderSummary(base, head, diffs)}
+		${content}
+	</main>
+</body>
+</html>
+`);
+}

packages-private/diagnostics-frontend/src/browser/scenario.ts

@@ -0,0 +1,31 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { closeUserSetupDialog, postNote, registerUser, resetState, signupThroughUi, visitHome } from '../../../../packages/frontend/test/e2e/shared';
+import { sleep } from './server';
+import type { HeadlessChromeController } from './controller';
+
+export const scenarioDescription = 'fresh browser signup, first timeline note, after the note becomes visible';
+
+/**
+ * 各ラウンドを同じ初期状態から始めるため、DBを消して管理者だけ作り直す。
+ */
+export async function prepareInstance(baseUrl: string) {
+	await resetState(baseUrl);
+	await registerUser(baseUrl, 'admin', 'admin1234', true);
+}
+
+export async function runSignupAndPostScenario(chrome: HeadlessChromeController, baseUrl: string) {
+	const page = chrome.page;
+	const noteText = `Frontend browser metrics ${Date.now()}`;
+
+	await visitHome(page, baseUrl);
+	await signupThroughUi(page, { username: 'alice', password: 'password' });
+	await closeUserSetupDialog(page);
+	await postNote(page, noteText, 10_000);
+
+	// 投稿直後の非同期処理が落ち着いてから計測したいので少し待つ
+	await sleep(1000);
+}

packages-private/diagnostics-frontend/src/browser/server.ts

@@ -0,0 +1,104 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { spawn, spawnSync, type ChildProcess } from 'node:child_process';
+
+export function sleep(ms: number) {
+	return new Promise(resolvePromise => setTimeout(resolvePromise, ms));
+}
+
+function commandName(command: string) {
+	if (process.platform !== 'win32') return command;
+	if (command === 'pnpm') return 'pnpm.cmd';
+	return command;
+}
+
+/**
+ * 計測対象のリポジトリで Misskey テストサーバーを起動する。
+ * POSIXでは detached にして、後で子孫プロセスごとまとめて落とせるようにする。
+ */
+export function startServer(label: string, repoDir: string) {
+	process.stderr.write(`[${label}] Starting Misskey test server\n`);
+	const child = spawn(commandName('pnpm'), ['start:test'], {
+		cwd: repoDir,
+		env: process.env,
+		stdio: ['ignore', 'pipe', 'pipe'],
+		detached: process.platform !== 'win32',
+	});
+	child.stdout.on('data', data => process.stderr.write(`[server:${label}] ${data}`));
+	child.stderr.on('data', data => process.stderr.write(`[server:${label}] ${data}`));
+	return child;
+}
+
+const serverStartupTimeoutMs = 120_000;
+
+function hasExited(child: ChildProcess) {
+	return child.exitCode != null || child.signalCode != null;
+}
+
+export async function waitForServer(baseUrl: string, child: ChildProcess) {
+	const startedAt = Date.now();
+	while (Date.now() - startedAt < serverStartupTimeoutMs) {
+		if (child.exitCode != null) throw new Error(`Misskey server exited early with code ${child.exitCode}`);
+		if (child.signalCode != null) throw new Error(`Misskey server exited early with signal ${child.signalCode}`);
+		try {
+			// 応答が返らないままだとfetchが待ち続け、外側の120秒の上限を超えてしまう
+			const remainingMs = serverStartupTimeoutMs - (Date.now() - startedAt);
+			const response = await fetch(`${baseUrl}/`, {
+				redirect: 'manual',
+				signal: AbortSignal.timeout(remainingMs),
+			});
+			if (response.status < 500) return;
+		} catch {
+			// 中断・接続拒否いずれもまだ起動中とみなしてリトライする
+		}
+		await sleep(1_000);
+	}
+	throw new Error(`Timed out waiting for ${baseUrl}`);
+}
+
+export async function stopServer(child: ChildProcess) {
+	if (hasExited(child)) return;
+
+	if (process.platform === 'win32') {
+		spawnSync('taskkill', ['/pid', String(child.pid), '/t', '/f'], { stdio: 'ignore' });
+	} else if (child.pid != null) {
+		try {
+			// プロセスグループごと落とさないと pnpm 配下の node が残る
+			process.kill(-child.pid, 'SIGTERM');
+		} catch {
+			child.kill('SIGTERM');
+		}
+	}
+
+	await new Promise<void>(resolvePromise => {
+		if (hasExited(child)) {
+			resolvePromise();
+			return;
+		}
+
+		const forceKillTimer = setTimeout(() => {
+			// 猶予の間に終了していれば、PIDが再利用されて無関係のプロセスを撃つ恐れがある
+			if (!hasExited(child) && child.pid != null) {
+				try {
+					if (process.platform === 'win32') {
+						spawnSync('taskkill', ['/pid', String(child.pid), '/t', '/f'], { stdio: 'ignore' });
+					} else {
+						process.kill(-child.pid, 'SIGKILL');
+					}
+				} catch {
+					child.kill('SIGKILL');
+				}
+			}
+			resolvePromise();
+		}, 10_000);
+		forceKillTimer.unref();
+
+		child.once('exit', () => {
+			clearTimeout(forceKillTimer);
+			resolvePromise();
+		});
+	});
+}

packages-private/diagnostics-frontend/src/browser/summarize.ts

@@ -0,0 +1,158 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { finiteMedian } from 'diagnostics-shared/stats';
+import { summarizeHeapSnapshotDataSamples } from 'diagnostics-shared/heap-snapshot';
+import { summarizeBrowserDiagnostics } from './diagnostics';
+import type { BrowserMeasurement, BrowserMeasurementSample, BrowserMetricsReport, NetworkSummary } from './types';
+
+export type SummarizeOptions = {
+	url: string;
+	heapSnapshotBreakdownTopN: number;
+};
+
+/**
+ * 中央値に最も近いサンプルを1つ選ぶ。
+ * largestRequests のように中央値を取れない項目は、代表サンプルの値をそのまま採用する。
+ */
+export function selectRepresentativeSample(samples: BrowserMeasurementSample[], getValue: (sample: BrowserMeasurementSample) => number) {
+	const medianValue = finiteMedian(samples.map(getValue), 0);
+	let selected: { sample: BrowserMeasurementSample; distance: number } | null = null;
+
+	for (const sample of samples) {
+		const value = getValue(sample);
+		if (!Number.isFinite(value)) continue;
+		const distance = Math.abs(value - medianValue);
+		if (selected == null || distance < selected.distance || (distance === selected.distance && sample.round < selected.sample.round)) {
+			selected = {
+				sample,
+				distance,
+			};
+		}
+	}
+
+	return selected?.sample ?? samples[0];
+}
+
+function summarizeResourceType(samples: BrowserMeasurementSample[], resourceType: string) {
+	return {
+		requests: finiteMedian(samples.map(sample => sample.network.byResourceType[resourceType]?.requests), 0),
+		encodedBytes: finiteMedian(samples.map(sample => sample.network.byResourceType[resourceType]?.encodedBytes), 0),
+		decodedBodyBytes: finiteMedian(samples.map(sample => sample.network.byResourceType[resourceType]?.decodedBodyBytes), 0),
+	};
+}
+
+export function summarizeNetworkSamples(samples: BrowserMeasurementSample[]): NetworkSummary {
+	const resourceTypes = new Set<string>();
+	for (const sample of samples) {
+		for (const resourceType of Object.keys(sample.network.byResourceType)) {
+			resourceTypes.add(resourceType);
+		}
+	}
+
+	const representative = selectRepresentativeSample(samples, sample => sample.network.totalEncodedBytes);
+	const byResourceType = {} as NetworkSummary['byResourceType'];
+	for (const resourceType of resourceTypes) {
+		byResourceType[resourceType] = summarizeResourceType(samples, resourceType);
+	}
+
+	return {
+		requestCount: finiteMedian(samples.map(sample => sample.network.requestCount), 0),
+		webSocketConnectionCount: finiteMedian(samples.map(sample => sample.network.webSocketConnectionCount), 0),
+		webSocketSentBytes: finiteMedian(samples.map(sample => sample.network.webSocketSentBytes), 0),
+		webSocketReceivedBytes: finiteMedian(samples.map(sample => sample.network.webSocketReceivedBytes), 0),
+		finishedRequestCount: finiteMedian(samples.map(sample => sample.network.finishedRequestCount), 0),
+		failedRequestCount: finiteMedian(samples.map(sample => sample.network.failedRequestCount), 0),
+		cachedRequestCount: finiteMedian(samples.map(sample => sample.network.cachedRequestCount), 0),
+		serviceWorkerRequestCount: finiteMedian(samples.map(sample => sample.network.serviceWorkerRequestCount), 0),
+		totalEncodedBytes: finiteMedian(samples.map(sample => sample.network.totalEncodedBytes), 0),
+		totalDecodedBodyBytes: finiteMedian(samples.map(sample => sample.network.totalDecodedBodyBytes), 0),
+		sameOriginEncodedBytes: finiteMedian(samples.map(sample => sample.network.sameOriginEncodedBytes), 0),
+		thirdPartyEncodedBytes: finiteMedian(samples.map(sample => sample.network.thirdPartyEncodedBytes), 0),
+		byResourceType,
+		largestRequests: representative.network.largestRequests,
+		failedRequests: representative.network.failedRequests,
+	};
+}
+
+export function summarizePerformanceSamples(samples: BrowserMeasurementSample[]): BrowserMeasurement['performance'] {
+	const cdpMetricKeys = new Set<string>();
+	for (const sample of samples) {
+		for (const key of Object.keys(sample.performance.cdpMetrics)) {
+			cdpMetricKeys.add(key);
+		}
+	}
+
+	const cdpMetrics = {} as Record<string, number>;
+	for (const key of cdpMetricKeys) {
+		cdpMetrics[key] = finiteMedian(samples.map(sample => sample.performance.cdpMetrics[key]), 0);
+	}
+
+	const webVitalKeys = [
+		'firstPaintMs',
+		'firstContentfulPaintMs',
+		'domContentLoadedEventEndMs',
+		'loadEventEndMs',
+		'longTaskCount',
+		'longTaskDurationMs',
+		'maxLongTaskDurationMs',
+		'resourceEntryCount',
+		'domElements',
+	] as const satisfies (keyof BrowserMeasurement['performance']['webVitals'])[];
+
+	const webVitals = {} as BrowserMeasurement['performance']['webVitals'];
+	for (const key of webVitalKeys) {
+		webVitals[key] = finiteMedian(samples.map(sample => sample.performance.webVitals[key]), 0);
+	}
+
+	return {
+		cdpMetrics,
+		runtimeHeap: {
+			usedSize: finiteMedian(samples.map(sample => sample.performance.runtimeHeap?.usedSize), 0),
+			totalSize: finiteMedian(samples.map(sample => sample.performance.runtimeHeap?.totalSize), 0),
+		},
+		tabMemory: {
+			totalBytes: finiteMedian(samples.map(sample => sample.performance.tabMemory.totalBytes), 0),
+		},
+		webVitals,
+	};
+}
+
+export function summarizeHeapSnapshotSamples(samples: BrowserMeasurementSample[], breakdownTopN: number) {
+	const summary = summarizeHeapSnapshotDataSamples(
+		samples,
+		sample => sample.heapSnapshot,
+		{ breakdownTopN },
+	);
+	if (summary == null) throw new Error('No heap snapshot samples');
+	return summary;
+}
+
+export function summarizeSamples(label: 'base' | 'head', samples: BrowserMeasurementSample[], options: SummarizeOptions): BrowserMetricsReport {
+	if (samples.length === 0) throw new Error(`No browser metric samples for ${label}`);
+	const representative = selectRepresentativeSample(samples, sample => sample.network.totalEncodedBytes);
+	const summary: BrowserMeasurement = {
+		label,
+		timestamp: new Date().toISOString(),
+		url: options.url,
+		scenario: representative.scenario,
+		diagnostics: summarizeBrowserDiagnostics(samples.map(sample => sample.diagnostics)),
+		durationMs: finiteMedian(samples.map(sample => sample.durationMs), 0),
+		network: summarizeNetworkSamples(samples),
+		performance: summarizePerformanceSamples(samples),
+		heapSnapshot: summarizeHeapSnapshotSamples(samples, options.heapSnapshotBreakdownTopN),
+	};
+
+	return {
+		label,
+		timestamp: new Date().toISOString(),
+		url: options.url,
+		scenario: representative.scenario,
+		sampleCount: samples.length,
+		aggregation: 'median',
+		summary,
+		samples,
+	};
+}

packages-private/diagnostics-frontend/src/browser/types.ts

@@ -0,0 +1,144 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import type { HeapSnapshotData } from 'diagnostics-shared/heap-snapshot';
+
+// NOTE: (AI向け)
+// NetworkRequest がリクエスト本文と要求・応答ヘッダを保持し、APIキーやパスワード、Cookieなどの認証情報も含まれ得るが、
+// workflow上で作られるMisskeyアカウントはテスト用アカウントであり、誰かが実際に使用するプライベートなアカウントではないため、
+// それらの情報が第三者から閲覧できても何の問題もなく、脆弱性ではない。
+
+export type NetworkRequest = {
+	requestId: string;
+	url: string;
+	method: string;
+	resourceType: string;
+	startedAt: number;
+	documentUrl?: string;
+	requestHeaders?: Record<string, string>;
+	requestBody?: string;
+	hasRequestBody: boolean;
+	status?: number;
+	statusText?: string;
+	mimeType?: string;
+	responseHeaders?: Record<string, string>;
+	protocol?: string;
+	remoteIPAddress?: string;
+	remotePort?: number;
+	encodedDataLength: number;
+	decodedBodyLength: number;
+	fromDiskCache: boolean;
+	fromServiceWorker: boolean;
+	finished: boolean;
+	failed: boolean;
+	errorText?: string;
+};
+
+export type WebSocketConnection = {
+	requestId: string;
+	url: string;
+	createdAt: number;
+	handshakeRequestHeaders?: Record<string, string>;
+	handshakeResponseStatus?: number;
+	handshakeResponseStatusText?: string;
+	handshakeResponseHeaders?: Record<string, string>;
+	closedAt?: number;
+	sentFrameCount: number;
+	receivedFrameCount: number;
+	sentBytes: number;
+	receivedBytes: number;
+	errorCount: number;
+};
+
+export type NetworkSummary = {
+	requestCount: number;
+	webSocketConnectionCount: number;
+	webSocketSentBytes: number;
+	webSocketReceivedBytes: number;
+	finishedRequestCount: number;
+	failedRequestCount: number;
+	cachedRequestCount: number;
+	serviceWorkerRequestCount: number;
+	totalEncodedBytes: number;
+	totalDecodedBodyBytes: number;
+	sameOriginEncodedBytes: number;
+	thirdPartyEncodedBytes: number;
+	byResourceType: Record<string, {
+		requests: number;
+		encodedBytes: number;
+		decodedBodyBytes: number;
+	}>;
+	largestRequests: {
+		url: string;
+		method: string;
+		resourceType: string;
+		status?: number;
+		encodedBytes: number;
+		decodedBodyBytes: number;
+	}[];
+	failedRequests: {
+		url: string;
+		method: string;
+		resourceType: string;
+		errorText?: string;
+		status?: number;
+	}[];
+};
+
+export type TabMemory = {
+	totalBytes: number;
+};
+
+export type BrowserDiagnostics = {
+	pageErrorCount: number;
+	console: Record<'log' | 'warning' | 'error' | 'info', number>;
+};
+
+export type BrowserMeasurement = {
+	label: string;
+	timestamp: string;
+	url: string;
+	scenario: string;
+	diagnostics: BrowserDiagnostics;
+	durationMs: number;
+	network: NetworkSummary;
+	performance: {
+		cdpMetrics: Record<string, number>;
+		runtimeHeap?: {
+			usedSize: number;
+			totalSize: number;
+		};
+		tabMemory: TabMemory;
+		webVitals: {
+			firstPaintMs?: number;
+			firstContentfulPaintMs?: number;
+			domContentLoadedEventEndMs?: number;
+			loadEventEndMs?: number;
+			longTaskCount: number;
+			longTaskDurationMs: number;
+			maxLongTaskDurationMs: number;
+			resourceEntryCount: number;
+			domElements: number;
+		};
+	};
+	heapSnapshot: HeapSnapshotData;
+};
+
+export type BrowserMeasurementSample = BrowserMeasurement & {
+	round: number;
+	/** ラウンド単位のリクエスト差分HTMLを描くために生ログを丸ごと保持する */
+	networkRequests: NetworkRequest[];
+};
+
+export type BrowserMetricsReport = {
+	label: string;
+	timestamp: string;
+	url: string;
+	scenario: string;
+	sampleCount: number;
+	aggregation: 'median';
+	summary: BrowserMeasurement;
+	samples: BrowserMeasurementSample[];
+};

packages-private/diagnostics-frontend/src/bundle/chunk-report.ts

@@ -0,0 +1,218 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import {
+	calcAndFormatDeltaBytes,
+	calcAndFormatDeltaPercentInMdTable,
+	escapeMdTableCell,
+	formatBytes,
+} from 'diagnostics-shared/format';
+import type { CollectedBundleReport, FileEntry } from './manifest';
+
+/**
+ * この差分以下のチャンクは個別に出さず `(other)` にまとめる。
+ * ハッシュ文字列の揺れ等でサイズが数バイト動くだけの行がノイズになるため。
+ */
+const smallDeltaThreshold = 5;
+
+/** diff表に個別行として出す上限。これを超えた分は `(other)` に集約する */
+const diffRowLimit = 30;
+
+function entryDisplayName(entry: FileEntry | undefined) {
+	if (entry == null) return '';
+	return entry.displayName || entry.file;
+}
+
+export function getChunkComparisonRows(keys: string[], base: Partial<Record<string, FileEntry>>, head: Partial<Record<string, FileEntry>>) {
+	return keys.map(key => {
+		const baseEntry = base[key];
+		const headEntry = head[key];
+		const baseSize = baseEntry?.size ?? 0;
+		const headSize = headEntry?.size ?? 0;
+		return {
+			key,
+			name: entryDisplayName(baseEntry ?? headEntry),
+			baseFile: baseEntry?.file,
+			headFile: headEntry?.file,
+			baseSize,
+			headSize,
+			changeType: baseEntry == null ? 'added' : headEntry == null ? 'removed' : baseSize !== headSize ? 'updated' : 'unchanged',
+			sortSize: Math.max(baseSize, headSize),
+		};
+	});
+}
+
+export type ChunkComparisonRow = ReturnType<typeof getChunkComparisonRows>[number];
+
+export type ChunkAggregate = {
+	baseSize: number;
+	headSize: number;
+	baseCount: number;
+	headCount: number;
+};
+
+export function sumChunkSizes(chunks: FileEntry[]) {
+	return chunks.reduce((sum, chunk) => sum + chunk.size, 0);
+}
+
+/**
+ * 比較キーを持たない (= base/head で対応付けできない) チャンクの合計。
+ */
+export function generatedAggregate(base: FileEntry[], head: FileEntry[]): ChunkAggregate {
+	const baseGenerated = base.filter(chunk => chunk.comparisonKey == null);
+	const headGenerated = head.filter(chunk => chunk.comparisonKey == null);
+	return {
+		baseSize: sumChunkSizes(baseGenerated),
+		headSize: sumChunkSizes(headGenerated),
+		baseCount: baseGenerated.length,
+		headCount: headGenerated.length,
+	};
+}
+
+export function hasSmallDelta(row: ChunkComparisonRow) {
+	return Math.abs(row.headSize - row.baseSize) <= smallDeltaThreshold;
+}
+
+export function comparisonRowsAggregate(rows: ChunkComparisonRow[]): ChunkAggregate {
+	return {
+		baseSize: rows.reduce((sum, row) => sum + row.baseSize, 0),
+		headSize: rows.reduce((sum, row) => sum + row.headSize, 0),
+		baseCount: rows.filter(row => row.baseFile != null).length,
+		headCount: rows.filter(row => row.headFile != null).length,
+	};
+}
+
+export function comparableMap(chunks: FileEntry[]) {
+	const entries: [string, FileEntry][] = [];
+	for (const chunk of chunks) {
+		if (chunk.comparisonKey != null) entries.push([chunk.comparisonKey, chunk]);
+	}
+	return Object.fromEntries(entries);
+}
+
+export function summarizeChunkChanges(rows: ChunkComparisonRow[]) {
+	return {
+		updated: rows.filter((row) => row.changeType === 'updated').length,
+		added: rows.filter((row) => row.changeType === 'added').length,
+		removed: rows.filter((row) => row.changeType === 'removed').length,
+	};
+}
+
+export function formatChunkChangeSummary(label: string, summary: ReturnType<typeof summarizeChunkChanges>) {
+	return `${label} (${summary.updated} updated, ${summary.added} added, ${summary.removed} removed)`;
+}
+
+/**
+ * 差分の絶対値が大きい順。同着は増加側・元サイズ・名前の順で決定的に並べる。
+ */
+export function compareChunkComparisonRows(a: ChunkComparisonRow, b: ChunkComparisonRow) {
+	return Math.abs(b.headSize - b.baseSize) - Math.abs(a.headSize - a.baseSize)
+		|| (b.headSize - b.baseSize) - (a.headSize - a.baseSize)
+		|| b.sortSize - a.sortSize
+		|| a.name.localeCompare(b.name);
+}
+
+export function chunkFileDisplay(row: ChunkComparisonRow) {
+	if (row.baseFile == null) return row.headFile ?? '';
+	if (row.headFile == null || row.baseFile === row.headFile) return row.baseFile;
+	return `${row.baseFile} → ${row.headFile}`;
+}
+
+export function chunkMarkdownTable(
+	rows: ChunkComparisonRow[],
+	total?: { baseSize: number; headSize: number },
+	generated?: ChunkAggregate,
+	other?: ChunkAggregate,
+) {
+	const hasGenerated = generated != null && (generated.baseCount > 0 || generated.headCount > 0);
+	const hasOther = other != null && (other.baseCount > 0 || other.headCount > 0);
+	if (rows.length === 0 && total == null && !hasGenerated && !hasOther) return '_No data_';
+
+	const lines = [
+		'| Chunk | Base | Head | Δ | Δ (%) |', // nbspにすること
+		'| --- | ---: | ---: | ---: | ---: |',
+	];
+	if (total != null) {
+		lines.push(`| (total) | ${formatBytes(total.baseSize)} | ${formatBytes(total.headSize)} | ${calcAndFormatDeltaBytes(total.baseSize, total.headSize, 1000)} | ${calcAndFormatDeltaPercentInMdTable(total.baseSize, total.headSize, 0.1)} |`);
+		lines.push('| | | | | |');
+	}
+
+	for (const row of rows) {
+		const chunkFile = chunkFileDisplay(row);
+		if (row.changeType === 'added') {
+			lines.push(`| <details><summary>\`${escapeMdTableCell(row.name)}\`</summary> \`${escapeMdTableCell(chunkFile)}\` </details> | ${formatBytes(row.baseSize)} | ${formatBytes(row.headSize)} | ${calcAndFormatDeltaBytes(row.baseSize, row.headSize, 1000)} | $\\color{orange}{\\text{( + )}}$ |`);
+		} else if (row.changeType === 'removed') {
+			lines.push(`| <details><summary>\`${escapeMdTableCell(row.name)}\`</summary> \`${escapeMdTableCell(chunkFile)}\` </details> | ${formatBytes(row.baseSize)} | ${formatBytes(row.headSize)} | ${calcAndFormatDeltaBytes(row.baseSize, row.headSize, 1000)} | $\\color{green}{\\text{( - )}}$ |`);
+		} else {
+			lines.push(`| <details><summary>\`${escapeMdTableCell(row.name)}\`</summary> \`${escapeMdTableCell(chunkFile)}\` </details> | ${formatBytes(row.baseSize)} | ${formatBytes(row.headSize)} | ${calcAndFormatDeltaBytes(row.baseSize, row.headSize, 1000)} | ${calcAndFormatDeltaPercentInMdTable(row.baseSize, row.headSize, 0.1)} |`);
+		}
+	}
+	if (hasGenerated) {
+		// eslint-disable-next-line no-irregular-whitespace
+		lines.push(`| (other generated chunks) | ${formatBytes(generated.baseSize)} | ${formatBytes(generated.headSize)} | ${calcAndFormatDeltaBytes(generated.baseSize, generated.headSize, 1000)} | ${calcAndFormatDeltaPercentInMdTable(generated.baseSize, generated.headSize, 0.1)} |`); // nbspにすること
+	}
+	if (hasOther) {
+		lines.push(`| (other) | ${formatBytes(other.baseSize)} | ${formatBytes(other.headSize)} | ${calcAndFormatDeltaBytes(other.baseSize, other.headSize, 1000)} | ${calcAndFormatDeltaPercentInMdTable(other.baseSize, other.headSize, 0.1)} |`);
+	}
+	return lines.join('\n');
+}
+
+export function renderFrontendChunkReport(base: CollectedBundleReport, head: CollectedBundleReport) {
+	const baseComparable = base.comparableChunks;
+	const headComparable = head.comparableChunks;
+	const allChunkKeys = [...new Set([...Object.keys(baseComparable), ...Object.keys(headComparable)])];
+	const allComparisonRows = getChunkComparisonRows(allChunkKeys, baseComparable, headComparable);
+
+	const changedRows = allComparisonRows.filter((row) => row.changeType !== 'unchanged');
+	const diffSummary = summarizeChunkChanges(changedRows);
+	const diffTotal = {
+		baseSize: sumChunkSizes(base.chunks),
+		headSize: sumChunkSizes(head.chunks),
+	};
+	const diffGenerated = generatedAggregate(base.chunks, head.chunks);
+	const largeDeltaRows = changedRows.filter(row => !hasSmallDelta(row)).sort(compareChunkComparisonRows);
+	const diffRows = largeDeltaRows.slice(0, diffRowLimit);
+	// 表示上限で切り捨てた行も `(other)` に含める。落とすと合計が実際の変化量と合わなくなる
+	const diffOther = comparisonRowsAggregate([
+		...changedRows.filter(hasSmallDelta),
+		...largeDeltaRows.slice(diffRowLimit),
+	]);
+
+	const baseStartupFiles = new Set(base.startupFiles);
+	const headStartupFiles = new Set(head.startupFiles);
+	const baseStartupChunks = base.chunks.filter(chunk => baseStartupFiles.has(chunk.file));
+	const headStartupChunks = head.chunks.filter(chunk => headStartupFiles.has(chunk.file));
+	const baseStartupComparable = comparableMap(baseStartupChunks);
+	const headStartupComparable = comparableMap(headStartupChunks);
+	const startupKeys = [...new Set([...Object.keys(baseStartupComparable), ...Object.keys(headStartupComparable)])];
+	const startupComparisonRows = getChunkComparisonRows(startupKeys, baseStartupComparable, headStartupComparable);
+	const startupSummary = summarizeChunkChanges(startupComparisonRows);
+	const startupOther = comparisonRowsAggregate(startupComparisonRows.filter(hasSmallDelta));
+	const startupRows = startupComparisonRows.filter(row => !hasSmallDelta(row)).sort(compareChunkComparisonRows);
+	const startupTotal = {
+		baseSize: sumChunkSizes(baseStartupChunks),
+		headSize: sumChunkSizes(headStartupChunks),
+	};
+	const startupGenerated = generatedAggregate(baseStartupChunks, headStartupChunks);
+
+	return [
+		'<details>',
+		`<summary>${formatChunkChangeSummary('Chunk size diff', diffSummary)}</summary>`,
+		'',
+		chunkMarkdownTable(diffRows, diffTotal, diffGenerated, diffOther),
+		'',
+		'</details>',
+		'',
+		'<details>',
+		`<summary>${formatChunkChangeSummary('Startup chunk size', startupSummary)}</summary>`,
+		'',
+		chunkMarkdownTable(startupRows, startupTotal, startupGenerated, startupOther),
+		'',
+		'_Startup chunks are the Vite entry for \`src/_boot_.ts\` and its static imports._',
+		'',
+		'</details>',
+		'',
+	].join('\n');
+}

packages-private/diagnostics-frontend/src/bundle/fs-utils.ts

@@ -0,0 +1,41 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { promises as fs } from 'node:fs';
+import path from 'node:path';
+
+/**
+ * Windows の `\` 区切りを `/` に揃える。manifest 側のキーが常に `/` 区切りのため、
+ * 実ファイルパスと突き合わせる前に正規化する必要がある。
+ */
+export function normalizePath(filePath: string) {
+	return filePath.split(path.sep).join('/');
+}
+
+export async function fileExists(filePath: string) {
+	try {
+		await fs.access(filePath);
+		return true;
+	} catch (error) {
+		if ((error as NodeJS.ErrnoException).code === 'ENOENT') return false;
+		throw error;
+	}
+}
+
+export async function fileSize(filePath: string) {
+	const stat = await fs.stat(filePath);
+	return stat.size;
+}
+
+export async function* traverseDirectory(dir: string): AsyncGenerator<string> {
+	for (const entry of await fs.readdir(dir, { withFileTypes: true })) {
+		const fullPath = path.join(dir, entry.name);
+		if (entry.isDirectory()) {
+			yield* traverseDirectory(fullPath);
+		} else if (entry.isFile()) {
+			yield fullPath;
+		}
+	}
+}

packages-private/diagnostics-frontend/src/bundle/manifest.ts

@@ -0,0 +1,180 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { promises as fs } from 'node:fs';
+import path from 'node:path';
+import { fileExists, fileSize, normalizePath, traverseDirectory } from './fs-utils';
+
+export type BundleManifestChunk = {
+	file: string;
+	src?: string;
+	name?: string;
+	isEntry?: boolean;
+	imports?: string[];
+};
+
+export type BundleManifest = Record<string, BundleManifestChunk>;
+
+/**
+ * 比較対象とするロケール。ロケール別チャンクは全ロケール分だと数が多すぎるため、
+ * 代表として ja-JP のみを見る。
+ */
+const locale = 'ja-JP';
+
+/**
+ * `src` を持たないチャンクのうち、名前がビルド間で安定していて比較可能なもの。
+ */
+const stableNamedChunks = new Set(['vue', 'i18n']);
+
+export type FileEntry = {
+	comparisonKey: string | null;
+	displayName: string;
+	file: string;
+	manifestKeys: string[];
+	size: number;
+};
+
+export type CollectedBundleReport = {
+	manifest: BundleManifest;
+	chunks: FileEntry[];
+	comparableChunks: Record<string, FileEntry>;
+	chunksByManifestKey: Record<string, FileEntry>;
+	startupFiles: string[];
+};
+
+export function findEntryKey(manifest: BundleManifest) {
+	const entries = Object.entries(manifest);
+	return entries.find(([key, chunk]) => key === 'src/_boot_.ts' || chunk.src === 'src/_boot_.ts')?.[0]
+		?? entries.find(([, chunk]) => chunk.name === 'entry' && chunk.isEntry)?.[0]
+		?? entries.find(([, chunk]) => chunk.isEntry)?.[0]
+		?? null;
+}
+
+/**
+ * ビルド間で安定するチャンク識別子。出力ファイル名はハッシュ付きで毎回変わるため、
+ * これが取れないチャンクは base/head の対応付けができない。
+ */
+export function stableChunkKey(chunk: BundleManifestChunk) {
+	if (chunk.src != null) return `src:${normalizePath(chunk.src)}`;
+	if (chunk.name != null && stableNamedChunks.has(chunk.name)) return `named:${chunk.name}`;
+	return null;
+}
+
+/**
+ * 起動時に必ず読み込まれるチャンク (entry とその静的 import) の manifest キーを集める。
+ */
+export function collectStartupManifestKeys(manifest: BundleManifest) {
+	const entryKey = findEntryKey(manifest);
+	const keys = new Set<string>();
+	if (entryKey == null) throw new Error('Unable to find frontend startup entry in Vite manifest.');
+
+	function visit(key: string, importedBy?: string) {
+		if (keys.has(key)) return;
+		const chunk = manifest[key];
+		const importContext = importedBy == null ? '' : ` imported by "${importedBy}"`;
+		// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+		if (chunk == null) throw new Error(`Startup manifest key "${key}"${importContext} is missing.`);
+		// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+		if (chunk.file == null || chunk.file.length === 0) throw new Error(`Startup manifest key "${key}"${importContext} has no output file.`);
+		if (!chunk.file.endsWith('.js')) throw new Error(`Startup manifest key "${key}"${importContext} resolves to non-JavaScript output "${chunk.file}".`);
+		keys.add(key);
+		for (const importKey of chunk.imports ?? []) visit(importKey, key);
+	}
+
+	visit(entryKey);
+	return keys;
+}
+
+/**
+ * manifest 上の出力パスを実ファイルへ解決する。`scripts/` 配下はロケール別に
+ * 複製されて出力されるため、代表ロケールのものへ読み替える。
+ */
+export async function resolveBuiltFile(outDir: string, file: string) {
+	if (file.startsWith('scripts/')) {
+		const localizedFile = file.slice('scripts/'.length);
+		const localizedPath = path.join(outDir, locale, localizedFile);
+		if (await fileExists(localizedPath)) {
+			return {
+				absolutePath: localizedPath,
+				relativePath: `${locale}/${localizedFile}`,
+			};
+		}
+
+		throw new Error(`Expected ${locale} localized chunk for ${file}, but ${localizedPath} was not found.`);
+	}
+	return {
+		absolutePath: path.join(outDir, file),
+		relativePath: file,
+	};
+}
+
+export async function collectBundleReport(repoDir: string): Promise<CollectedBundleReport> {
+	const outDir = path.join(repoDir, 'built/_frontend_vite_');
+	const manifestPath = path.join(outDir, 'manifest.json');
+	const manifest = JSON.parse(await fs.readFile(manifestPath, 'utf8')) as BundleManifest;
+	const chunksByFile = new Map<string, FileEntry>();
+	const comparableChunks = new Map<string, FileEntry>();
+	const chunksByManifestKey = new Map<string, FileEntry>();
+
+	for (const [manifestKey, chunk] of Object.entries(manifest)) {
+		if (!chunk.file.endsWith('.js')) continue;
+		const builtFile = await resolveBuiltFile(outDir, chunk.file);
+		const comparisonKey = stableChunkKey(chunk);
+		let entry = chunksByFile.get(builtFile.relativePath);
+		if (entry == null) {
+			entry = {
+				comparisonKey,
+				displayName: chunk.src ?? chunk.name ?? manifestKey,
+				file: builtFile.relativePath,
+				manifestKeys: [manifestKey],
+				size: await fileSize(builtFile.absolutePath),
+			};
+			chunksByFile.set(entry.file, entry);
+		} else if (entry.comparisonKey !== comparisonKey) {
+			throw new Error(`Conflicting identities for ${entry.file}`);
+		} else {
+			entry.manifestKeys.push(manifestKey);
+		}
+		chunksByManifestKey.set(manifestKey, entry);
+		if (comparisonKey != null) {
+			const existing = comparableChunks.get(comparisonKey);
+			if (existing != null && existing.file !== entry.file) {
+				throw new Error(`Duplicate stable chunk key "${comparisonKey}": ${existing.file}, ${entry.file}`);
+			}
+			comparableChunks.set(comparisonKey, entry);
+		}
+	}
+
+	// manifest に載らないロケール別チャンクも合計サイズには含めたいので拾っておく
+	const localeDir = path.join(outDir, locale);
+	if (await fileExists(localeDir)) {
+		for await (const fullPath of traverseDirectory(localeDir)) {
+			if (!fullPath.endsWith('.js')) continue;
+			const relativePath = normalizePath(path.relative(outDir, fullPath));
+			if (chunksByFile.has(relativePath)) continue;
+			chunksByFile.set(relativePath, {
+				comparisonKey: null,
+				displayName: relativePath,
+				file: relativePath,
+				manifestKeys: [],
+				size: await fileSize(fullPath),
+			});
+		}
+	}
+
+	const startupFiles = new Set<string>();
+	for (const manifestKey of collectStartupManifestKeys(manifest)) {
+		const entry = chunksByManifestKey.get(manifestKey);
+		if (entry != null) startupFiles.add(entry.file);
+	}
+
+	return {
+		manifest,
+		chunks: [...chunksByFile.values()],
+		comparableChunks: Object.fromEntries(comparableChunks),
+		chunksByManifestKey: Object.fromEntries(chunksByManifestKey),
+		startupFiles: [...startupFiles],
+	};
+}

packages-private/diagnostics-frontend/src/bundle/visualizer.ts

@@ -0,0 +1,204 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import {
+	calcAndFormatDeltaBytes,
+	calcAndFormatDeltaNumber,
+	calcAndFormatDeltaPercent,
+	formatBytes,
+	formatNumber,
+} from 'diagnostics-shared/format';
+
+/**
+ * rollup-plugin-visualizer が出力する `stats.json` のうち、ここで使う部分のみの型。
+ */
+export type VisualizerReport = {
+	nodeParts?: Record<string, {
+		renderedLength: number;
+		gzipLength: number;
+		brotliLength: number;
+	}>;
+	nodeMetas?: Record<string, {
+		id: string;
+		isEntry?: boolean;
+		isExternal?: boolean;
+		importedBy?: string[];
+		imported?: { id: string; dynamic?: boolean }[];
+		moduleParts?: Record<string, string>;
+		renderedLength: number;
+		gzipLength: number;
+		brotliLength: number;
+	}>;
+	options?: Record<string, unknown>;
+};
+
+type ModuleRow = {
+	id: string;
+	bundles: number;
+	renderedLength: number;
+	gzipLength: number;
+	brotliLength: number;
+	importedByCount: number;
+	importedCount: number;
+};
+
+type BundleRow = {
+	id: string;
+	modules: number;
+	renderedLength: number;
+	gzipLength: number;
+	brotliLength: number;
+};
+
+export function collectVisualizerReport(data: VisualizerReport) {
+	const nodeParts = data.nodeParts ?? {};
+	const nodeMetas = Object.values(data.nodeMetas ?? {});
+	const moduleRows: ModuleRow[] = [];
+	const bundleMap = new Map<string, BundleRow>();
+
+	for (const meta of nodeMetas) {
+		const row: ModuleRow = {
+			id: meta.id,
+			bundles: 0,
+			renderedLength: 0,
+			gzipLength: 0,
+			brotliLength: 0,
+			importedByCount: meta.importedBy?.length ?? 0,
+			importedCount: meta.imported?.length ?? 0,
+		};
+
+		for (const [bundleId, partUid] of Object.entries(meta.moduleParts ?? {})) {
+			const part = nodeParts[partUid];
+			// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+			if (part == null) continue;
+
+			row.bundles += 1;
+			row.renderedLength += part.renderedLength;
+			row.gzipLength += part.gzipLength;
+			row.brotliLength += part.brotliLength;
+
+			const bundle = bundleMap.get(bundleId) ?? {
+				id: bundleId,
+				modules: 0,
+				renderedLength: 0,
+				gzipLength: 0,
+				brotliLength: 0,
+			};
+			bundle.modules += 1;
+			bundle.renderedLength += part.renderedLength;
+			bundle.gzipLength += part.gzipLength;
+			bundle.brotliLength += part.brotliLength;
+			bundleMap.set(bundleId, bundle);
+		}
+
+		// どのバンドルにも含まれないモジュール (tree-shake 済み等) は集計対象外
+		if (row.bundles > 0) {
+			moduleRows.push(row);
+		}
+	}
+
+	let staticImports = 0;
+	let dynamicImports = 0;
+	for (const meta of nodeMetas) {
+		for (const imported of meta.imported ?? []) {
+			if (imported.dynamic) {
+				dynamicImports += 1;
+			} else {
+				staticImports += 1;
+			}
+		}
+	}
+
+	const bundleRows = [...bundleMap.values()].sort((a, b) => b.renderedLength - a.renderedLength);
+	const hotModules = [...moduleRows].sort((a, b) => b.renderedLength - a.renderedLength);
+	const totalRendered = moduleRows.reduce((sum, row) => sum + row.renderedLength, 0);
+	const totalGzip = moduleRows.reduce((sum, row) => sum + row.gzipLength, 0);
+	const totalBrotli = moduleRows.reduce((sum, row) => sum + row.brotliLength, 0);
+
+	return {
+		options: data.options ?? {},
+		summary: {
+			bundles: bundleRows.length,
+			modules: moduleRows.length,
+			entries: nodeMetas.filter((meta) => meta.isEntry).length,
+			externals: nodeMetas.filter((meta) => meta.isExternal).length,
+			staticImports,
+			dynamicImports,
+		},
+		metrics: {
+			renderedLength: totalRendered,
+			gzipLength: totalGzip,
+			brotliLength: totalBrotli,
+		},
+		hotModules,
+	};
+}
+
+/**
+ * NOTE: 以前はこの関数が `string[]` を返しており、呼び出し側の `[...].join('\n')` の
+ * 要素として配列のまま埋め込まれていたため、テーブルがカンマ区切りの1行に潰れていた。
+ * 呼び出し側で意識しなくて済むよう、ここで文字列にして返す。
+ */
+export function renderVisualizerSummaryTable(base: ReturnType<typeof collectVisualizerReport>, head: ReturnType<typeof collectVisualizerReport>) {
+	const summary = [
+		'bundles',
+		'modules',
+		'entries',
+		//'externals',
+		'staticImports',
+		'dynamicImports',
+	] as const;
+
+	const metrics = [
+		'renderedLength',
+		'gzipLength',
+		'brotliLength',
+	] as const;
+
+	return [
+		'<table>',
+		'<thead>',
+		'<tr>',
+		'<th rowspan="2"></th>',
+		'<th rowspan="2">Bundles</th>',
+		'<th rowspan="2">Modules</th>',
+		'<th rowspan="2">Entries</th>',
+		'<th colspan="2">Imports</th>',
+		'<th colspan="3">Size</th>',
+		'</tr>',
+		'<tr>',
+		'<th>Static</th>',
+		'<th>Dynamic</th>',
+		'<th>Rendered</th>',
+		'<th>Gzip</th>',
+		'<th>Brotli</th>',
+		'</tr>',
+		'</thead>',
+		'<tbody>',
+		'<tr>',
+		'<th><b>Base</b></th>',
+		...summary.map((key) => `<td>${formatNumber(base.summary[key])}</td>`),
+		...metrics.map((key) => `<td>${formatBytes(base.metrics[key])}</td>`),
+		'</tr>',
+		'<tr>',
+		'<th><b>Head</b></th>',
+		...summary.map((key) => `<td>${formatNumber(head.summary[key])}</td>`),
+		...metrics.map((key) => `<td>${formatBytes(head.metrics[key])}</td>`),
+		'</tr>',
+		'<tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr>',
+		'<tr>',
+		'<th><b>Δ</b></th>',
+		...summary.map((key) => `<td>${calcAndFormatDeltaNumber(base.summary[key], head.summary[key], 0)}</td>`),
+		...metrics.map((key) => `<td>${calcAndFormatDeltaBytes(base.metrics[key], head.metrics[key], 1000)}</td>`),
+		'</tr>',
+		'<tr>',
+		'<th><b>Δ&nbsp;(%)</b></th>',
+		...summary.map((key) => `<td>${calcAndFormatDeltaPercent(base.summary[key], head.summary[key], 0.1)}</td>`),
+		...metrics.map((key) => `<td>${calcAndFormatDeltaPercent(base.metrics[key], head.metrics[key], 0.1)}</td>`),
+		'</tr>',
+		'</tbody>',
+		'</table>',
+	].join('\n');
+}

packages-private/diagnostics-frontend/src/inspect-browser.ts

@@ -0,0 +1,128 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { copyFile, mkdir, rm, writeFile } from 'node:fs/promises';
+import { join, resolve } from 'node:path';
+import { readIntegerEnv, readOptionalEnv } from 'diagnostics-shared/env';
+import { analyzeHeapSnapshot, defaultHeapSnapshotBreakdownTopN } from 'diagnostics-shared/heap-snapshot';
+import { HeadlessChromeController } from './browser/controller';
+import { summarizeNetwork } from './browser/network';
+import { prepareInstance, runSignupAndPostScenario, scenarioDescription } from './browser/scenario';
+import { startServer, stopServer, waitForServer } from './browser/server';
+import { selectRepresentativeSample, summarizeSamples } from './browser/summarize';
+import type { BrowserMeasurementSample, BrowserMetricsReport } from './browser/types';
+
+type Label = 'base' | 'head';
+
+const labels = ['base', 'head'] as const satisfies readonly Label[];
+
+const baseUrl = process.env.FRONTEND_BROWSER_METRICS_URL ?? 'http://127.0.0.1:61812';
+const sampleCount = readIntegerEnv('FRONTEND_BROWSER_METRICS_SAMPLE_COUNT', 5, 1);
+const heapSnapshotBreakdownTopN = readIntegerEnv('FRONTEND_BROWSER_HEAP_SNAPSHOT_BREAKDOWN_TOP_N', defaultHeapSnapshotBreakdownTopN, 1);
+
+// 成果物 (artifact) としてアップロードされるファイルの出力先。CIではworkspace直下を指す
+const heapSnapshotOutputDir = resolve(readOptionalEnv('FRONTEND_BROWSER_HEAP_SNAPSHOT_OUTPUT_DIR') ?? process.cwd());
+const heapSnapshotWorkDirs = {
+	base: join(heapSnapshotOutputDir, 'frontend-browser-base-heap-snapshots'),
+	head: join(heapSnapshotOutputDir, 'frontend-browser-head-heap-snapshots'),
+} as const;
+const heapSnapshotOutputPaths = {
+	base: join(heapSnapshotOutputDir, 'base-heap-snapshot.heapsnapshot'),
+	head: join(heapSnapshotOutputDir, 'head-heap-snapshot.heapsnapshot'),
+} as const;
+
+function heapSnapshotPath(label: Label, round: number) {
+	return join(heapSnapshotWorkDirs[label], `round-${round}.heapsnapshot`);
+}
+
+/**
+ * ブラウザを毎ラウンド立ち上げ直して1サンプル分を計測する。
+ * ブラウザを使い回すとキャッシュや前ラウンドのGC残渣が乗るため、必ず作り直す。
+ */
+async function measureSample(label: Label, round: number, heapSnapshotSavePath: string): Promise<BrowserMeasurementSample> {
+	await prepareInstance(baseUrl);
+
+	return await HeadlessChromeController.with(label, { scenarioTimeoutMs: 120000, baseUrl }, async chrome => {
+		await chrome.enableNetworkTracking();
+
+		const startedAt = Date.now();
+		await runSignupAndPostScenario(chrome, baseUrl);
+		const durationMs = Date.now() - startedAt;
+
+		await chrome.waitForNetworkDetails();
+		const performance = await chrome.collectPerformance();
+		const heapSnapshotRaw = await chrome.takeHeapSnapshot(heapSnapshotSavePath);
+
+		return {
+			label,
+			round,
+			timestamp: new Date().toISOString(),
+			url: baseUrl,
+			scenario: scenarioDescription,
+			diagnostics: chrome.collectDiagnostics(),
+			durationMs,
+			network: summarizeNetwork(chrome.networkRequests, baseUrl, chrome.webSocketConnections),
+			networkRequests: chrome.networkRequests,
+			performance,
+			heapSnapshot: analyzeHeapSnapshot(heapSnapshotRaw, { breakdownTopN: heapSnapshotBreakdownTopN }),
+		};
+	});
+}
+
+/**
+ * 中央値に最も近いラウンドのスナップショットだけを成果物として残し、残りは捨てる。
+ */
+async function saveRepresentativeHeapSnapshot(label: Label, report: BrowserMetricsReport) {
+	const representative = selectRepresentativeSample(report.samples, sample => sample.heapSnapshot.categories.total);
+	await copyFile(heapSnapshotPath(label, representative.round), heapSnapshotOutputPaths[label]);
+	process.stderr.write(`[${label}] Selected round ${representative.round} heap snapshot for artifact\n`);
+	await rm(heapSnapshotWorkDirs[label], { recursive: true, force: true });
+}
+
+async function genReport(label: Label, repoDir: string, outputPath: string) {
+	let server: ReturnType<typeof startServer> | null = null;
+
+	try {
+		server = startServer(label, repoDir);
+		await waitForServer(baseUrl, server);
+
+		await rm(heapSnapshotWorkDirs[label], { recursive: true, force: true });
+		await mkdir(heapSnapshotWorkDirs[label], { recursive: true });
+
+		const samples: BrowserMeasurementSample[] = [];
+		for (let round = 1; round <= sampleCount; round++) {
+			process.stderr.write(`[${label}] Measuring browser metrics sample ${round}/${sampleCount}\n`);
+			samples.push(await measureSample(label, round, heapSnapshotPath(label, round)));
+		}
+
+		const report = summarizeSamples(label, samples, { url: baseUrl, heapSnapshotBreakdownTopN });
+		await writeFile(outputPath, JSON.stringify(report, null, '\t'));
+		process.stderr.write(`[${label}] Wrote browser metrics report to ${outputPath}\n`);
+
+		await saveRepresentativeHeapSnapshot(label, report);
+	} finally {
+		if (server != null) await stopServer(server);
+	}
+}
+
+async function main() {
+	const [baseDirArg, headDirArg, baseOutputArg, headOutputArg] = process.argv.slice(2);
+	if (baseDirArg == null || headDirArg == null || baseOutputArg == null || headOutputArg == null) {
+		throw new Error('Usage: inspect-browser <baseDir> <headDir> <baseOutputJson> <headOutputJson>');
+	}
+
+	for (const label of labels) {
+		await rm(heapSnapshotOutputPaths[label], { force: true });
+	}
+
+	// base / head は同じポートでサーバーを立てるため、並行させず順番に計測する
+	await genReport('base', resolve(baseDirArg), resolve(baseOutputArg));
+	await genReport('head', resolve(headDirArg), resolve(headOutputArg));
+}
+
+await main().catch(err => {
+	console.error(err);
+	process.exit(1);
+});

packages-private/diagnostics-frontend/src/render-browser-html.ts

@@ -0,0 +1,26 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { readFile, writeFile } from 'node:fs/promises';
+import { resolve } from 'node:path';
+import { renderBrowserDiagnosticsHtml } from './browser/report/html';
+import type { BrowserMetricsReport } from './browser/types';
+
+async function main() {
+	const [baseFileArg, headFileArg, outputFileArg] = process.argv.slice(2);
+	if (baseFileArg == null || headFileArg == null || outputFileArg == null) {
+		throw new Error('Usage: render-browser-html <baseJson> <headJson> <outHtml>');
+	}
+
+	const base = JSON.parse(await readFile(resolve(baseFileArg), 'utf8')) as BrowserMetricsReport;
+	const head = JSON.parse(await readFile(resolve(headFileArg), 'utf8')) as BrowserMetricsReport;
+
+	await writeFile(resolve(outputFileArg), renderBrowserDiagnosticsHtml(base, head));
+}
+
+await main().catch(err => {
+	console.error(err);
+	process.exit(1);
+});