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@opentelemetry/instrumentation-fastify - npm

OpenTelemetry Fastify Instrumentation for Node.js

[!IMPORTANT] This component is deprecated in favor of the official instrumentation package @fastify/otel, maintained by the Fastify authors. Please see here for instructions on how to use @fastify/otel.

We will stop publishing new versions of @opentelemetry/instrumentation-fastify on June 30, 2025.

This module provides automatic instrumentation for the fastify module, which may be loaded using the @opentelemetry/sdk-trace-node package.

Compatible with OpenTelemetry JS API and SDK 1.0+.

This instrumentation relies on HTTP calls to also be instrumented. Make sure you install and enable both, otherwise you will have spans that are not connected with each other.

npm install --save @opentelemetry/instrumentation-http @opentelemetry/instrumentation-fastify

fastify versions >=3.0.0 <5

OpenTelemetry fastify Instrumentation allows the user to automatically collect trace data and export them to their backend of choice, to give observability to distributed systems.

To load the instrumentation, specify it in the Node Tracer's configuration:

const { NodeTracerProvider } = require('@opentelemetry/node');
const { registerInstrumentations } = require('@opentelemetry/instrumentation');
const { HttpInstrumentation } = require('@opentelemetry/instrumentation-http');
const { FastifyInstrumentation } = require('@opentelemetry/instrumentation-fastify');

const provider = new NodeTracerProvider();
provider.register();

registerInstrumentations({
  instrumentations: [
    // Fastify instrumentation expects HTTP layer to be instrumented
    new HttpInstrumentation(),
    new FastifyInstrumentation(),
  ],
});

See examples/fastify for a short example.

Fastify Instrumentation Options Options Type Example Description requestHook FastifyCustomAttributeFunction (span, requestInfo) => {} Function for adding custom attributes to Fastify requests. Receives parameters: Span, FastifyRequestInfo.

Instrumentation configuration accepts a custom "hook" function which will be called for every instrumented Fastify request. Custom attributes can be set on the span or run any custom logic per request.

import { FastifyInstrumentation } from "@opentelemetry/instrumentation-fastify"

const fastifyInstrumentation = new FastifyInstrumentation({
  requestHook: function (span: Span, info: FastifyRequestInfo) {
    span.setAttribute(
      'http.method',
      info.request.method,
    )
  }
});

This package uses @opentelemetry/semantic-conventions version 1.22+, which implements Semantic Convention Version 1.7.0

Attributes collected:

Attribute Short Description http.route The matched route (path template).

For more information on OpenTelemetry, visit: https://opentelemetry.io/
For more about OpenTelemetry JavaScript: https://github.com/open-telemetry/opentelemetry-js
For help or feedback on this project, join us in GitHub Discussions

Apache 2.0 - See LICENSE for more information.

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