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You can update to MariaDB 10.11.7 on AlmaLinux 9.3 (Shamrock Pampas Cat).
Just disable (/delete) the Plesk database rules in the php.ini and use "sudo dnf update -y"
Maybe some logging services are not running
https://talk.plesk.com/threads/no-entry-in-var-log-maillog-messages-secure-etc-0-b.355516/#:~:text=The%20following%20helped%20me%3A
Looks like a brute force attack!
https://www.plesk.com/kb/support/constant-failed-mail-authenticatication-entries-are-logged-in-mail-log-in-plesk-server/
Could be many things, look at the Tools and Settings > Proces List
Maybe many bots visits are slowing down your hosting.
Optimize PHP settings, enable Opcache, Nginx and Redis!
For WordPress i recommend: WordPress Super Cache + Autoptimize for TTFB and Minify CSS, Javascript and HTML
Also...
Just reboot your Server instance in the Plesk / Tools & Settings / Restart Server!
Use Newsletters spam test by mail-tester.com to check the mail configuration!
Seems you have some wrong CentOS / Debian configuration leftovers!
Try in the SSH console:
plesk repair installation
Or maybe try this:
https://bobcares.com/blog/plesk-update-failed-in-ubuntu/
Yeah, the Performance Booster does not make any significant speed improvement's.
I use the PHP Redis Cache on Plesk and for WordPress, Wordpress Supercache + Autoptimize plugins and the Redis Object Cache plugin!
https://bobcares.com/blog/install-redis-on-plesk/
I am using AlmaLinux 9.3 (Shamrock Pampas Cat) for 3 months now without any problems!
The limitations described i don't use anyway, so considering if you do not use this extension....
https://support.plesk.com/hc/en-us/articles/12376955168919-Does-Plesk-support-RHEL9-AlmaLinux-9
Try to replica the clients issue!
If you can't replica the issue and there are no related errors in the server logs, they must be doing something wrong!