Prometheus用のエンドポイントを実装

apps/server/package.json

@@ -12,13 +12,15 @@
     "dev": "bun run --hot src/main.ts"
   },
   "dependencies": {
+    "@hono/prometheus": "^1.0.0",
     "@hono/zod-openapi": "^0.9.5",
     "@read-stack/database": "workspace:*",
     "@read-stack/lib": "workspace:*",
     "@read-stack/openapi": "workspace:*",
     "@read-stack/tsconfig": "workspace:*",
     "@supabase/ssr": "^0.0.10",
     "hono": "^3.11.11",
+    "prom-client": "^15.1.0",
     "rss-parser": "^3.13.0",
     "zod": "^3.22.4"
   },

apps/server/src/index.ts

@@ -9,11 +9,16 @@ import { loggerMiddleware } from '@/middleware/logger';
 import type { WithSupabaseClient } from '@/middleware/supabase';
 import { supabaseMiddleware } from '@/middleware/supabase';
 import { corsMiddleware } from '@/middleware/cors';
+import {
+  prometheusHandler,
+  prometheusMiddleware,
+} from '@/middleware/prometheus';
 
 export const app = new OpenAPIHono().basePath('/api');
 
 app.use('*', loggerMiddleware);
 app.use('*', corsMiddleware);
+app.use('*', prometheusMiddleware);
 
 const v1 = app.basePath('/v1');
 
@@ -26,5 +31,6 @@ registerUsersHandlers(
 registerArticlesHandlers(v1);
 registerDocsHandler(v1);
 registerAuthHandlers(v1 as unknown as WithSupabaseClient);
+v1.get('/metrics', prometheusHandler);
 
 export const handler = handle(app);

apps/server/src/middleware/prometheus.ts

@@ -0,0 +1,6 @@
+import { prometheus } from '@hono/prometheus';
+
+export const {
+  printMetrics: prometheusHandler,
+  registerMetrics: prometheusMiddleware,
+} = prometheus();