Node.js Integration — Guance Docs

The Guance Node.js integration instruments Express, Koa, and NestJS with the ddtrace-compatible or OpenTelemetry library — one require() at startup, and every request becomes a trace with RED metrics attached. Event-loop lag, the classic Node early-warning signal, is charted alongside trace latency in the pre-built dashboard. Migration from an existing dd-trace setup is an env-var change, covered in the quickstart linked below.

Spec	Detail
Collector	DataKit input `ddtrace / otlp`
Protocol	ddtrace-agent protocol or OTLP (traces)
Key metrics	event-loop lag, heap usage, RED per service, trace waterfalls
Prerequisites	Install the tracing library; require it first at startup; point exporter at DataKit
Dashboard	Pre-built Node.js dashboard, auto-installed on first data
Deep dive	APM Monitoring Guide

Set up in minutes — install DataKit, enable the ddtrace / otlp input, and your first Node.js metrics appear in Guance within about a minute. Full field list and alert-rule templates live in the APM Monitoring Guide.

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