GAE Flex (Python) huge lag after ~24h run time and no more logs in stackdriver

[Christopher Bender]

Hi,

I've been facing a new issue recently with an App Engine Flex instance.

After running for around 24h+, the app becomes incredibly slow to respond.

Pages which take ~1 sec usually take around 15-30 sec to load.

When checking the logs, I then noticed that it stopped logging stderr for several hours.

The last few logs I see are for stackdriver logging agent :

2020-07-25 19:35:30.231 HKT2020-07-25 11:35:29 +0000 [warn]: #0 buffer flush took longer time than slow_flush_log_threshold: elapsed_time=30.276559944992187 slow_flush_log_threshold=20.0 plugin_id="object:16b1e98"

Plenty of those lines and nothing in stderr.

My only solution at the moment is to stop and start the version.

Then everything comes back to normal.

Any idea how to avoid this issue ?

Thanks a lot !

Chris

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