Question Grafana/Monitoring reported boot partition usage warning today, but no usage change lately

[Bitpalast]

Server operating system version

Alma 8 and 9

Plesk version and microupdate number

18.0.77 #2 and 18.0.78 latest

This morning on all our Alma 8 and Alma 9 servers, Grafana Monitoring tool reported that the threshold of boot partition disk usage was exceeded. However, when I skip backwards to previous days, nothing has changed on the boot partitions. This should only leave the conclusion that the Grafana threshold value was changed so that all servers suddenly reported an overuse.

Is this a known issue/behavior?

As I have not visited this report for a very long while (because nothing should really change on the boot partition unless a crash dump is created or a new kernel installed) I am not sure what the threshold was before. I did check whether new files are shown in the boot partition, but the last changes were in May when a kernel update was mandatory due to the Alma CVEs. Nothing changed after that update, yet today was the first time the Grafana Monitoring warnings came in.

 

[Bitpalast]

I also saw that the warning was reported twice: Once at night (e.g. 5.09 am) when obviously something was checked and then again when I opened the panel to check what's going on (at around 9 am). Normally, a disk usage warning only appears once.