Build production observability in 2026: structured logging with Pino, metrics with Prometheus/Grafana, distributed tracing with OpenTelemetry, error tracking with Sentry, and alerting.
Master end-to-end LLM observability with OpenTelemetry spans, Langfuse tracing, and token-level cost tracking to catch production issues before users do.
Complete OpenTelemetry setup for Node.js, auto-instrumentation, custom spans, trace propagation, OTLP export to Tempo/Jaeger, sampling strategies, and production alerting.