uwsgi app stall gathering /metrics

Hello 👋 , I have a timeout on /metrics endpoint. I followed the example of uwsgi file:

cat app/__init__.py
...
app = Flask(__appname__)
metrics = UWsgiPrometheusMetrics(app)
metrics.register_endpoint('/metrics')
...

cat app/api/__init.py
...
app.logger.info('Starting the app...')
metrics.start_http_server(port))
metrics.info('app_info', 'Application info', version=__version__)
...

The app starts correctly. One of my resources is correctly responding, ex:

[pid: 64365|app: 0|req: 4/5] 127.0.0.1 () {24 vars in 257 bytes} [Wed Oct 23 09:47:48 2019] GET /test => generated 4 bytes in 0 msecs (HTTP/1.1 200) 2 headers in 78 bytes (2 switches on core 0)

but the /metrics endpoint is not, the HTTP session timeout with:

curl: (56) Recv failure: Connection reset by peer

Any idea?

uwsgi config:

[uwsgi]
http-socket = :5000
; wsgi-file = wsgi.py
module = wsgi:app
; socket = /var/run/app
; chdir = /usr/local/bin/app
; chown-socket = www-data:www-data
chmod-socket = 660
callable = app
master = true
processes = 2
die-on-term = true
; logto = /var/log/uwsgi/app.log
venv = /tmp/venv
env = prometheus_multiproc_dir=/tmp/flask_microservice_boilerplate/metrics

the prometheus_multiproc_dir dir is correctly filled with:

ls /tmp/flask_microservice_boilerplate/metrics
counter_45330.db  counter_57640.db  gauge_all_45304.db  gauge_all_50896.db  gauge_all_57640.db  gauge_all_64364.db  histogram_50896.db  histogram_64364.db
counter_50895.db  counter_60502.db  gauge_all_45330.db  gauge_all_56034.db  gauge_all_60498.db  gauge_all_64365.db  histogram_57639.db  histogram_64365.db
counter_50896.db  counter_64364.db  gauge_all_50891.db  gauge_all_57636.db  gauge_all_60502.db  histogram_45330.db  histogram_57640.db
counter_57639.db  counter_64365.db  gauge_all_50895.db  gauge_all_57639.db  gauge_all_64361.db  histogram_50895.db  histogram_60502.db

[kaminek]

Hi @rycus86 sorry I was on vacation, I’ll do some debug tests asap

[rycus86]

Closing this for inactivity, feel free to reopen if needed and have more data!