feat(infra): add OTel auto-instrumentations across all services

NestJS 6 services use getNodeAutoInstrumentations().

Python 2 services use FastAPIInstrumentor. Go 2 services use otelgin.

services/msg/package.json

@@ -27,7 +27,8 @@
     "reflect-metadata": "^0.2.2",
     "rxjs": "^7.8.0",
     "@opentelemetry/sdk-node": "^0.55.0",
-    "@opentelemetry/exporter-trace-otlp-http": "^0.55.0"
+    "@opentelemetry/exporter-trace-otlp-http": "^0.55.0",
+    "@opentelemetry/auto-instrumentations-node": "^0.55.0"
   },
   "devDependencies": {
     "@nestjs/cli": "^10.4.0",

services/msg/src/shared/observability/tracer.ts

@@ -1,6 +1,7 @@
-import { NodeSDK } from '@opentelemetry/sdk-node';
-import { OTLPTraceExporter } from '@opentelemetry/exporter-trace-otlp-http';
-import { env } from '../../config/env.js';
+import { getNodeAutoInstrumentations } from "@opentelemetry/auto-instrumentations-node";
+import { OTLPTraceExporter } from "@opentelemetry/exporter-trace-otlp-http";
+import { NodeSDK } from "@opentelemetry/sdk-node";
+import { env } from "../../config/env.js";
 
 let sdk: NodeSDK | null = null;
 
@@ -8,14 +9,15 @@ export function initTracer(): void {
   if (!env.OTEL_EXPORTER_OTLP_ENDPOINT) return;
 
   sdk = new NodeSDK({
-    serviceName: 'msg',
+    serviceName: "msg",
     traceExporter: new OTLPTraceExporter({
       url: `${env.OTEL_EXPORTER_OTLP_ENDPOINT}/v1/traces`,
     }),
+    instrumentations: [getNodeAutoInstrumentations()],
   });
 
   sdk.start();
-  console.log('Tracer initialized');
+  console.log("Tracer initialized with auto-instrumentations");
 }
 
 export async function shutdownTracer(): Promise<void> {