Nestjs Observability

Observability Standards

Structured Logging

• Standard: Use nestjs-pino for high-performance JSON logging.
  • Why: Node's built-in console.log is blocking and unstructured.
• Configuration:
  • Redaction: Mandatory masking of sensitive fields (password, token, email).
  • Context: Always inject Logger and set the context (LoginService).

Tracing (Correlation)

• Request ID: Every log line must include a reqId (Request ID).
  • nestjs-pino handles this automatically using AsyncLocalStorage.
  • : Pass to downstream microservices/database queries key to trace flows.