# Using yarn
yarn add @sentry/node @sentry/node-native
# Using npm
npm install --save @sentry/node @sentry/node-nativeThe eventLoopBlockIntegration can be used to monitor for blocked event loops in
all threads of a Node.js application.
If you instrument your application via the Node.js --import flag, Sentry will
be started and this instrumentation will be automatically applied to all worker
threads.
instrument.mjs
import * as Sentry from '@sentry/node';
import { eventLoopBlockIntegration } from '@sentry/node-native';
Sentry.init({
dsn: '__YOUR_DSN__',
// Capture stack traces when the event loop is blocked for more than 500ms
integrations: [eventLoopBlockIntegration({ threshold: 500 })],
});app.mjs
import { Worker } from 'worker_threads';
const worker = new Worker(new URL('./worker.mjs', import.meta.url));
// This main thread will be monitored for blocked event loopsworker.mjs
// This worker thread will also be monitored for blocked event loops tooStart your application:
node --import instrument.mjs app.mjsIf a thread is blocked for more than the configured threshold, stack traces will be captured for all threads and sent to Sentry.