@opentelemetry/instrumentation-fastify
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0.37.0 • Public • Published

OpenTelemetry Fastify Instrumentation for Node.js

NPM Published Version Apache License

This module provides automatic instrumentation for the fastify module, which may be loaded using the @opentelemetry/sdk-trace-node package and is included in the @opentelemetry/auto-instrumentations-node bundle.

If total installation size is not constrained, it is recommended to use the @opentelemetry/auto-instrumentations-node bundle with @opentelemetry/sdk-node for the most seamless instrumentation experience.

Installation

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

Supported Versions

  • fastify: ^3.0.0 || ^4.0.0

Usage

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.

Using requestHook

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,
    )
  }
});

Semantic Conventions

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).

Useful links

License

Apache 2.0 - See LICENSE for more information.

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Install

npm i @opentelemetry/instrumentation-fastify

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  • pichlermarc
  • bogdandrutu
  • dyladan