expressjsHow can I use OpenTelemetry with Express.js?

OpenTelemetry can be used with Express.js to instrument your application and collect telemetry data. To use OpenTelemetry with Express.js, you will need to install the @opentelemetry/express package and configure it.

The following example shows how to configure OpenTelemetry with Express.js:

const express = require('express');
const { ExpressInstrumentation } = require('@opentelemetry/express');
const { NodeTracerProvider } = require('@opentelemetry/node');

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

const app = express();
const instrumentation = new ExpressInstrumentation();

instrumentation.enable(app);

// Your Express routes

app.listen(3000);

This example will configure OpenTelemetry with Express.js and enable instrumentation.

Code explanation

1. const express = require('express'): This imports the Express.js library.
2. const { ExpressInstrumentation } = require('@opentelemetry/express'): This imports the OpenTelemetry Express.js instrumentation library.
3. const { NodeTracerProvider } = require('@opentelemetry/node'): This imports the OpenTelemetry Node.js tracer provider.
4. provider.register(): This registers the tracer provider with OpenTelemetry.
5. const instrumentation = new ExpressInstrumentation(): This creates a new OpenTelemetry Express.js instrumentation instance.
6. instrumentation.enable(app): This enables instrumentation on the Express.js application.

For more information, please refer to the OpenTelemetry Express.js documentation.

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