refactor(server): simplify metrics creation and usage (#5115)

packages/backend/server/package.json

@@ -48,6 +48,7 @@
     "@opentelemetry/instrumentation-ioredis": "^0.35.3",
     "@opentelemetry/instrumentation-nestjs-core": "^0.33.3",
     "@opentelemetry/instrumentation-socket.io": "^0.34.3",
+    "@opentelemetry/resources": "^1.18.1",
     "@opentelemetry/sdk-metrics": "^1.18.1",
     "@opentelemetry/sdk-node": "^0.45.1",
     "@opentelemetry/sdk-trace-node": "^1.18.1",