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34. Logging and Observability

Structured logs, metrics and traces.

log/slog provides structured levelled logging in the standard library. Emit key-value fields rather than formatted sentences so logs are queryable. Add Prometheus metrics for rates and latencies and OpenTelemetry traces to follow a request across services.

Check your understanding

  1. 1. Structured logs are preferred because they are…

  2. 2. Which standard package offers structured logging?