Breadcrumbs related to an event are only visible in the next events, and also breadcrumbs are not isolated in the event.

[apaschenko]

Is there an existing issue for this?

• [X] I have checked for existing issues https://github.com/getsentry/sentry-javascript/issues
• [X] I have reviewed the documentation https://docs.sentry.io/
• [X] I am using the latest SDK release https://github.com/getsentry/sentry-javascript/releases

How do you use Sentry?

Sentry Saas (sentry.io)

Which SDK are you using?

@sentry/node

SDK Version

8.0.0-beta.4

Framework Version

Node v20.10.0

Link to Sentry event

https://bringlynl.sentry.io/performance/trace/75cb252cba585d363aca45ea7cff6bf8/?field=title&field=event.type&field=project&field=user.display&field=timestamp&name=All+Events&node=txn-ddae5123833a446085d16d8406daa356&project=4507056912269312&query=&sort=-timestamp&statsPeriod=24h&timestamp=1714357793&yAxis=count%28%29

SDK Setup

const Sentry = require('@sentry/node');
const { config } = require('dotenv');

config();

Sentry.init({
  dsn: process.env.DSN,
  integrations: [
    Sentry.httpIntegration({ tracing: true, breadcrumbs: true }),
  ],
  tracesSampleRate: 1.0,
  profilesSampleRate: 1.0,
});

const express = require('express');

const app = express();

app.get("/breadcrumb/:name", function rootHandler(req, res) {
  Sentry.addBreadcrumb({
    message: `It's a breadcrum for "${req.params.name}"`
  })

  res.end(req.params.name);
});

app.get("/error", function mainHandler(req, res) {
  const message = 'It\'s a breadcrumb for exception!';
  console.log(message);
  Sentry.addBreadcrumb({ message });
  throw new Error("My first Sentry error!");
});

Sentry.setupExpressErrorHandler(app);

// Optional fallthrough error handler
app.use(function onError(err, req, res, next) {
  // The error id is attached to `res.sentry` to be returned
  // and optionally displayed to the user for support.
  res.statusCode = 500;
  res.end(`${res.sentry}\n`);
});

app.listen(3000);

Steps to Reproduce

1. Clone, install and start the test project (you will need to create .env file in the root directory containing the line "DSN=")
2. Type in the address bar of your browser:
   • 127.0.0.1/breadcrumb/br-1
   • 127.0.0.1/breadcrumb/br-2
   • 127.0.0.1/breadcrumb/br-3
   • 127.0.0.1/breadcrumb/br-4

Expected Result

In breadcrumbs section of corresponding event pages (sentry.io):

• It's a breadcrumb for "br-1" - on breadcrumb/br-1 transaction page,
• It's a breadcrumb for "br-2" - on breadcrumb/br-2 transaction page,
• It's a breadcrumb for "br-3" - on breadcrumb/br-3 transaction page.
• It's a breadcrumb for "br-4" - on breadcrumb/br-4 transaction page.

Actual Result

• no breadcrumbs for breadcrumb/br-1 transaction;
• It's a breadcrumb for "br-1" for breadcrumb/br-2 transaction;
• It's a breadcrumb for "br-1"; It's a breadcrumb for "br-2" for breadcrumb/br-3 transaction;
• It's a breadcrumb for "br-1"; It's a breadcrumb for "br-2"; It's a breadcrumb for "br-3"; for breadcrumb/br-4 transaction;

[HazAT]

First of all, thanks for the awesome repro 🥇 Indeed if I look at your data, it looks wrong, however, if I use your example repo you provided and run it locally myself with a test DSN I get correct data (I also run the same Node version 20.10)

[apaschenko]

@HazAT Thank you so much for your quick and comprehensive response and for the time you spent trying to reproduce the bug. Hence I have some kind of local problem. I'll sort this out.