Observability Practices in Action: Instrumenting a Node.js API with Metrics, Logs, and Traces

Short summary

Observability enables engineers to ask unanticipated questions about system behavior by analyzing emitted telemetry—unlike monitoring, which only detects predefined thresholds. This hands-on tutorial instruments a Node.js Express API with metrics (Prometheus), structured logs (pino), and distributed traces (OpenTelemetry), demonstrating how correlating these three pillars lets you drill into specific failures. Complete code examples let you build a working observability stack locally.

• •Observability vs monitoring: ask new questions without changing code
• •Three pillars—metrics, logs, traces—each provide different insights
• •Working tutorial correlates all three using Prometheus, pino, and OpenTelemetry

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