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Resolved PHP-FPM 8.1.14 - websites frequently unreachable

TimRear

New Pleskian
Server operating system version
Ubuntu 18.04.6 LTS
Plesk version and microupdate number
Obsidian Version 18.0.49
Hey Guys,
hope you are doing well!

In december we installed PHP 8.1 on our Plesk Server, created a new service plan and brought some subscriptions in it.
Since a couple of weeks, these sites are frequently not accessible (504 error) while the sites running on php 7.4 are still up. First it started once in a couple of days, but now the problem sometimes occurs several times a day. A restart of php-fpm 8.1.14 service bring this sites back to life, but just for a time.

Can you please help me to hunt this problem down?
I have already checked a lot of access and error logs, but cant find a major problem. all i find is nginx waiting for informations from apache after the problem occurs.

My first thought was that it might be a problem with pm.max_children - it is currently set to 10 for both php versions.

Thank you very much for your Support!


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Hardware: dedicated Server with 2xIntel 8-core CPU and 96GB RAM
 
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