gunicorn + flask,kibana show no data

Describe the bug: …

To Reproduce

1. … gunicorn worker-class gevent
2. …flask
3. …elastic-apm 6.4.0
4. …

Environment (please complete the following information)

• OS: [e.g. Linux]Linux
• Python version: 3.6.8
• Framework and version [e.g. Django 2.1]:
• APM Server version:7.3.1
• Agent version:

Additional context my flask flask_extensions.py code:

from flask import Flask
from elasticapm.contrib.flask import ElasticAPM

from config import config


flask_app = Flask(__name__)
flask_app.config.from_object(config)
flask_app.config['ELASTIC_APM'] = {
        'SERVICE_NAME': 'flask',
        'SECRET_TOKEN': 'xxx',
        'SERVER_URL': 'http://localhost:8200',
    }

apm = ElasticAPM()
apm.init_app(flask_app)

app.py content.

from flask_extensions import flask_app


if __name__ == '__main__':
    flask_app.run(host='0.0.0.0', port=8000, debug=False)

example a: run shell python app.py, after that, kibana can show some data.

example b: run shell

gunicorn --access-logfile - --error-logfile - \
   --workers 32 \
   --timeout 300 \
   --threads 2  \
   --bind 0.0.0.0:8000 \
   --worker-class gevent \
   --worker-connections 2000 \
   app:flask_app \
   2>&1 | tee ./backend_log.log

after that ,request the same url ,but can see nothing on kibana. i have tried change to pre_load = False or preload_app = False, but no effect.

Add any other context about the problem here.

• Agent config options

  Click to expand

  replace this line with your agent config options
  remember to mask any sensitive fields like tokens
  

• requirements.txt:

  Click to expand

  replace this line with your `requirements.txt`
  

[beniwohli]

@Alsheh ah, good to know. We document this requirement (e.g. https://www.elastic.co/guide/en/apm/agent/python/current/flask-support.html#flask-installation), so I don’t think there’s much more we can do here.

[beniwohli]

I’m closing this, as I wasn’t able to reproduce any issues specific to gunicorn/flask.