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@opentelemetry/instrumentation-fastify

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@opentelemetry/instrumentation-fastify

OpenTelemetry instrumentation for `fastify` http web application framework

  • 0.42.0
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What is @opentelemetry/instrumentation-fastify?

@opentelemetry/instrumentation-fastify is an npm package that provides automatic instrumentation for Fastify applications using OpenTelemetry. It helps in collecting and exporting telemetry data such as traces and metrics, which can be used for monitoring and performance analysis.

What are @opentelemetry/instrumentation-fastify's main functionalities?

Automatic Tracing

This code demonstrates how to set up automatic tracing for a Fastify application using @opentelemetry/instrumentation-fastify. It initializes the OpenTelemetry tracer provider and registers the Fastify instrumentation to automatically collect trace data for incoming requests.

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

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

registerInstrumentations({
  instrumentations: [
    new FastifyInstrumentation()
  ],
  tracerProvider: provider,
});

const fastify = require('fastify')();

fastify.get('/hello', async (request, reply) => {
  return { hello: 'world' };
});

fastify.listen(3000, err => {
  if (err) throw err;
  console.log('Server listening on http://localhost:3000');
});

Custom Span Attributes

This code sample shows how to add custom attributes to spans in a Fastify application. The `requestHook` option allows you to modify the span for each request, adding custom attributes that can be useful for more detailed telemetry data.

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

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

registerInstrumentations({
  instrumentations: [
    new FastifyInstrumentation({
      requestHook: (span, request) => {
        span.setAttribute('http.custom_attribute', 'custom_value');
      }
    })
  ],
  tracerProvider: provider,
});

const fastify = require('fastify')();

fastify.get('/hello', async (request, reply) => {
  return { hello: 'world' };
});

fastify.listen(3000, err => {
  if (err) throw err;
  console.log('Server listening on http://localhost:3000');
});

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Package last updated on 18 Nov 2024

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