Remove unused metrics writer

Author: MartinBraquet

backend/api/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@compass/api",
-  "version": "1.38.0",
+  "version": "1.38.1",
   "private": true,
   "description": "Backend API endpoints",
   "main": "src/serve.ts",

backend/api/src/serve.ts

@@ -7,7 +7,6 @@ import {ErrorRequestHandler} from 'express'
 import * as admin from 'firebase-admin'
 import {getServiceAccountCredentials} from 'shared/firebase-utils'
 import {initAdmin} from 'shared/init-admin'
-import {METRIC_WRITER} from 'shared/monitoring/metric-writer'
 import {log} from 'shared/utils'
 import {listen as webSocketListen} from 'shared/websockets/server'
 
@@ -46,7 +45,7 @@ if (IS_LOCAL) {
   })
 }
 
-METRIC_WRITER.start()
+// METRIC_WRITER.start()
 
 const credentials = IS_LOCAL
   ? getServiceAccountCredentials()

backend/shared/src/monitoring/metric-writer.ts

@@ -82,7 +82,7 @@ function serializeEntries(instance: InstanceInfo, entries: MetricStoreEntry[], t
 }
 
 /** Writes metrics out to GCP's API from a metric store on an interval. */
-export class MetricWriter {
+class MetricWriter {
   client: MetricServiceClient
   store: MetricStore
   intervalMs: number
@@ -101,7 +101,8 @@ export class MetricWriter {
       for (const entry of freshEntries) {
         entry.fresh = false
       }
-      if (IS_GOOGLE_CLOUD) {
+      if (IS_GOOGLE_CLOUD && !process.env.K_SERVICE) {
+        // only for vm, not cloud run
         log.debug('Writing GCP metrics.', {entries: freshEntries})
         if (this.instance == null) {
           this.instance = await getInstanceInfo()