Observability Standards

Priority: P1 (OPERATIONAL)

Structured Logging (Pino)

Use nestjs-pino for high-performance, async JSON logging. Node's console.log blocking and unstructured.

See implementation examples

Tracing (Correlation)

• Request ID: Every log line must include reqId. nestjs-pino handles this via AsyncLocalStorage.
• Propagation: Pass x-request-id to downstream microservices and database queries for end-to-end tracing.

Metrics

Expose /metrics for Prometheus scraping using @willsoto/nestjs-prometheus.