This module provides automatic metric instrumentation that exposes measurements from the Performance measurement APIs (i.e. perf_hooks). While currently it is limited to metrics, it may be modified to produce other signals in the future.
import { NodeSDK } from '@opentelemetry/sdk-node';
import { PrometheusExporter } from '@opentelemetry/exporter-prometheus';
import { RuntimeNodeInstrumentation } from '@opentelemetry/instrumentation-runtime-node';
const prometheusExporter = new PrometheusExporter({
port: 9464,
startServer: true
});
const sdk = new NodeSDK({
metricReader: prometheusExporter,
instrumentations: [new RuntimeNodeInstrumentation({
monitoringPrecision: 5000,
})],
});
sdk.start()
NodeSDK is the full OpenTelemetry SDK for Node.js that is a layer of abstraction on top of the @opentelemetry/sdk-metrics and @opentelemetry/sdk-trace-* packages. By specifying metricReader, it will initialize the metrics SDK and creates a MeterProvider. @opentelemetry/exporter-prometheus will output metrics collected by registered instrumentation on a /metrics endpoint.
# HELP nodejs_performance_event_loop_utilization Event loop utilization # UNIT nodejs_performance_event_loop_utilization 1 # TYPE nodejs_performance_event_loop_utilization gauge nodejs_performance_event_loop_utilization 0.010140079547955264
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