Sentry not logging Gunicorn timeout errors

We have quite a standard gunicorn setup with the default sync worker with the default 1 thread, running a Python app.

Gunicorn is started with this command line:

gunicorn \
    --workers=16 \
    --timeout=120 \
    -b 127.0.0.1:8082 \
    --paste production.ini \
    2>> api-err.log 1>> api-out.log

The Python Sentry integration is loaded with the following:

import sentry_sdk
from sentry_sdk.integrations.pyramid import PyramidIntegration

sentry_sdk.init(
    dsn="https://[e-mail]/123",
    integrations=[PyramidIntegration()],
    release='1.2.3'
)

config = Configurator(settings=settings)
...

The issue is that whenever a Gunicorn worker timeout occurs, it is not logged to Sentry. The only way we can see that there was a timeout is when we see “[CRITICAL] WORKER TIMEOUT” in api-err.log and the matching error code 499 lines in nginx.log.

It’d be important to log these timeout events to Sentry.

[darwinyip]

Bump on the issue. Similar configuration but with gunicorn + falcon + sentry sdk.

[antonpirker]

I have now reproduced the problem with the information above. I have a Falcon project running under Gunicorn: https://github.com/antonpirker/sample-projects-for-sentry/tree/main/falcon-project

I run gunicorn like this:

gunicorn \
    --workers=16 \
    --timeout=1 \
    -b 127.0.0.1:8000 \
    falcon-project:app

In my view I have a time.sleep(2) so the sample project always runs into a timeout.

To capture the Gunicorn Timeout you need to change the gunicorn executable. This is how you do it:

• Find the gunicorn executable script:

$ which gunicorn
/Users/antonpirker/code/sample-projects-for-sentry/falcon-project/.venv/bin/gunicorn
$ _

• Edit this file and Init Sentry SDK in it. Before it looks something like this:

#!/Users/antonpirker/code/sample-projects-for-sentry/falcon-project/.venv/bin/python
# -*- coding: utf-8 -*-
import re
import sys
from gunicorn.app.wsgiapp import run

if __name__ == '__main__':
    sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0])
    sys.exit(run())

• Edit this file and Init Sentry SDK in it. After editing and initializing the Sentry sdk it looks like this:

#!/Users/antonpirker/code/sample-projects-for-sentry/falcon-project/.venv/bin/python
# -*- coding: utf-8 -*-
import re
import sys
from gunicorn.app.wsgiapp import run

import os
import sentry_sdk
from sentry_sdk.integrations.falcon import FalconIntegration
sentry_sdk.init(
   dsn=os.environ.get('SENTRY_DSN', None),
   integrations=[FalconIntegration()]
)

if __name__ == '__main__':
    sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0])
    sys.exit(run())

• Now start your project with the same Gunicorn command
• The timeout errors should end up in your Sentry Issues:

This should solve this issue.