title: How does one implement Sentry Performance tracing (@sentry/tracing) in Node/Express
body: <p>I am trying to integrate @sentry/tracing into a NodeJS + Express app.</p>
  <p>Doesn't seem to be any documentation about that I can find (and I've submitted an issue to the documentation repo <a href="https://github.com/getsentry/sentry-docs/issues/2104" rel="nofollow noreferrer">here</a>).</p>
  <p>I have poked around @sentry/tracing code and there seems to be an Express integration available.</p>
  <p>Based on the integration source code, it looks like it should be instantiated liked this:</p>
  <pre><code>const express = require('express');
  
  const app = express();
  
  const Sentry = require('@sentry/node');
  const { Integrations } = require( &quot;@sentry/tracing&quot;);
  
  Sentry.init({ 
      dsn: __MY_SENTRY_DSN__,
      integrations: [
          new Integrations.Express({app}),
      ]
  });
  </code></pre>
  <p>I've tried this and i'm not getting any trace data in Sentry.</p>