Comprehensive Observability via Distributed Tracing on Node.js8
summary
Steps to add distributed tracing to callback‑heavy Node.js 8 services, with concrete tactics for context propagation, reducing span volume, and preserving low overhead; explains failures when naive instrumentation creates millions of spans and shows a service map built from sampled traces that reveals hidden cross‑service call chains and the single endpoint causing tail latency; delivers a reproducible trace sampling strategy and deployment checklist for rolling tracing into production so observability scales without crashing the monitoring stack.
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