Production Logging and Monitoring
Replace ad hoc console.log calls with structured JSON logging via Pino, correlate every log line with distributed traces through OpenTelemetry, and turn that signal into a basic alert.
Prerequisites: REST API Fundamentals with Node.js; ideally run alongside the other services you've built in this roadmap so you have more than one process to correlate.
Targeted versions: Pino 9.x; pino-http; OpenTelemetry Node SDK (@opentelemetry/sdk-node, current 0.5x line); verified against pino.io ecosystem docs and OpenTelemetry Node documentation, mid-2026.
console.log works fine on your laptop and falls apart the moment you have more than one service running in production — no severity levels, no structure to search on, and no way to tell which log lines belong to the same request as it crosses service boundaries. You'll wire up structured JSON logging with Pino, attach it to every incoming request, and connect it to OpenTelemetry so a trace ID ties a request's logs together across every service it touches.
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