Merge pull request #15 from navikt/dev/metrics

f legger til prometheus metrics

nais/dev-gcp/nais.yaml

@@ -15,7 +15,8 @@ spec:
     path: /aia-backend/internal/isReady
     initialDelay: 10
   prometheus:
-    enabled: false
+    enabled: true
+    path: /aia-backend/internal/prometheus
   replicas:
     min: 1
     max: 1

package.json

@@ -32,6 +32,7 @@
     "openid-client": "5.3.0",
     "pino": "8.7.0",
     "pino-http": "8.2.1",
+    "prom-client": "14.1.0",
     "swagger-jsdoc": "6.2.5",
     "swagger-ui-express": "4.6.0",
     "ulid": "2.3.0",

src/api/health.ts

@@ -1,14 +1,20 @@
 import { Router } from 'express';
+import { createMetrics } from './metrics';
 
 function healthRoutes() {
     const router = Router();
+    const register = createMetrics();
 
     router.get('/internal/isAlive', (_, res) => {
         res.send('ALIVE');
     });
     router.get('/internal/isReady', (_, res) => {
         res.send('READY');
     });
+    router.get('/internal/prometheus', async (_, res) => {
+        res.setHeader('Content-type', register.contentType);
+        res.send(await register.metrics());
+    });
 
     return router;
 }

src/api/metrics.ts

@@ -0,0 +1,7 @@
+import { collectDefaultMetrics, Registry } from 'prom-client';
+
+export function createMetrics(): Registry {
+    const register = new Registry();
+    collectDefaultMetrics({ register });
+    return register;
+}