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Nestjs observability

Skill FilippoDeSilva/skills/skills/nestjs/nestjs-observability

Skills for my agentic development workflow.

Install
npx -y skills add FilippoDeSilva/skills --skill nestjs-observability

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2 things to look at

  • no licenseNo license file was found in the repository. Code published without one is not open source by default, so using it at work is a question for whoever answers licensing questions where you are.
  • 2 stars2 stars. Stars are a popularity signal and not a quality one, but at this level it is likely that nobody has read this closely except its author, and you would be relying on your own review.

What its author says it does

Copied from the file, not written here

Configure structured logging with Pino, Prometheus metrics, and health checks for NestJS services. Use when adding JSON logging, request tracing with correlation IDs, Prometheus metric endpoints, or liveness/readiness health checks.

The file declares its own license as MIT. That is the author’s claim about this one file, and it is not the same thing as the license GitHub reports for the repository, which is listed with the other numbers below.

SKILL.md

2.0 KB, as published. Nobody here has run it

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.

See implementation examples

Health Checks

  • Terminus: Implement "Liveness" (I'm alive) vs "Readiness" (I can take traffic).
  • DB Check: TypeOrmHealthIndicator / PrismaHealthIndicator.
  • Memory Check: Fail readiness if Heap > 300MB to prevent crash loops.

Performance Headers (Dev Only)

  • X-Response-Duration-Ms, X-DB-Execution-Ms, X-API-Overhead-Ms
  • Gate behind ENABLE_PERFORMANCE_BENCHMARK feature flag; never expose in production.

Anti-Patterns

  • No console.log: Use nestjs-pino for async, structured, JSON-formatted logging.
  • No missing reqId: Propagate x-request-id header to all downstream services and queries.
  • No perf data in production by default: Gate benchmarking behind ENABLE_PERFORMANCE_BENCHMARK flag.

Keep looking

Skills are one crate of 328,083. Ordering is by how many stacks a row turns up in, so the top of any crate is what has actually been picked rather than what has the most stars.