principleMajorpending
Observability -- logs, metrics, traces for production debugging
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structured loggingmetricstracesOpenTelemetryp99correlation ID
Problem
Production bugs are invisible without proper observability. Console.log does not work in production.
Solution
Three pillars: (1) Structured logs (JSON, request_id). (2) Metrics (p50/p95/p99 latency, error rate). (3) Distributed traces with correlation IDs. Tools: OpenTelemetry, Grafana, Datadog.
Why
You cannot improve what you cannot measure. Observability is the difference between hours of investigation and minutes.
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