Auto instrumentation of express app is not sending exception event in trace

[legendary-acp]

What version of OpenTelemetry are you using?

"@opentelemetry/api": "1.8.0"
"@opentelemetry/auto-instrumentations-node": "0.44.0"

What version of Node are you using?

v20.12.2

What did you do?

Ran a simple express app which raises exception.

const express = require('express');
const app = express();


function ErrorGenerator(a, b) {
    if (b === 0) {
        throw new Error('Division by zero error');
    }
    return a / b;
}


app.get('/', (req, res) => {
    const result = ErrorGenerator(10, 0);
    console.log('Result:', result);
    res.send("Here is results of highest computed maths");
});

app.use((err, req, res, next) => {
    console.error('An error occurred:', err.message);
    res.status(400).send('Bad Request: ' + err.message);
    next(err);
  });

const port = 6002;
app.listen(port, () => {
    console.log(`Server is running on port ${port}`);
});

What did you expect to see?

On hitting the endpoint get a span with exception in event array. Somewhat similar to this:

{
  traceId: '7d57f374b49081a2c46aee1b9334d1c7',
  parentId: undefined,
  traceState: undefined,
  name: 'GET',
  id: 'dfdebec418911ea9',
  kind: 2,
  timestamp: 1714033150562000,
  duration: 3011281.152,
  attributes: {
    'http.url': 'http://169.254.169.254/computeMetadata/v1/instance',
    'http.method': 'GET',
    'http.target': '/computeMetadata/v1/instance',
    'net.peer.name': '169.254.169.254',
    'http.host': '169.254.169.254:80',
    'http.error_name': 'Error',
    'http.error_message': 'socket hang up'
  },
  status: { code: 2, message: 'socket hang up' },
  events: [
    {
      name: 'exception',
      attributes: {
        'exception.type': 'ECONNRESET',
        'exception.message': 'socket hang up',
        'exception.stacktrace': 'Error: socket hang up\n' +
          '    at Socket.socketCloseListener (node:_http_client:473:25)\n' +
          '    at Socket.emit (node:events:530:35)\n' +
          '    at TCP.<anonymous> (node:net:337:12)\n' +
          '    at TCP.callbackTrampoline (node:internal/async_hooks:130:17)'
      },
      time: [ 1714033153, 573273845 ],
      droppedAttributesCount: 0
    }
  ],
  links: []
}

What did you see instead?

{
  traceId: 'f2a2854b4e599d5abb83960e4904fb79',
  parentId: undefined,
  traceState: undefined,
  name: 'GET /',
  id: '46e1fb4811ce2415',
  kind: 1,
  timestamp: 1714033162279000,
  duration: 9807.383,
  attributes: {
    'http.url': 'http://localhost:6002/',
    'http.host': 'localhost:6002',
    'net.host.name': 'localhost',
    'http.method': 'GET',
    'http.scheme': 'http',
    'http.target': '/',
    'http.user_agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4.1 Safari/605.1.15',
    'http.flavor': '1.1',
    'net.transport': 'ip_tcp',
    'net.host.ip': '::1',
    'net.host.port': 6002,
    'net.peer.ip': '::1',
    'net.peer.port': 50140,
    'http.status_code': 400,
    'http.status_text': 'BAD REQUEST',
    'http.route': '/'
  },
  status: { code: 0 },
  events: [],
  links: []
}