Sprint 3 batch 3: OpenTelemetry tracing (opt-in)#131
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src/tracing.ts boots a NodeSDK with auto-instrumentations for
http/express/pg/mysql/redis when OTEL_EXPORTER_OTLP_ENDPOINT is set;
otherwise it's a no-op so the default install ships nothing.
Auto-instrumentations:
- fs spans disabled (one per file read on cold start = noise)
- http instrumentation ignores /health to keep liveness probes out
of the trace stream
Service identity attaches service.name / service.version /
deployment.environment.name from env (OTEL_SERVICE_NAME etc.) with
sensible defaults from npm_package_version + NODE_ENV.
main.ts calls startTracing() before NestFactory.create so the
instrumentations register before any of NestJS pulls in the modules
they wrap.
Sentry continues to work in parallel — operators who set both
SENTRY_DSN and OTEL_EXPORTER_OTLP_ENDPOINT get errors in Sentry and
traces in their OTLP collector.
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Boots a NodeSDK with auto-instrumentations for http/express/pg/mysql/redis when
OTEL_EXPORTER_OTLP_ENDPOINTis set. No-op otherwise. fs spans and/healthignored to keep noise out of the stream. Service identity attaches via standardservice.name/service.version/deployment.environment.namesemconv keys.main.tscallsstartTracing()beforeNestFactory.createso the instrumentations register before NestJS pulls in the modules they wrap.Verified: backend 554/555, tsc clean.