Change Alert severtiy from CRITICAL to WARNING

Does someone know if and how it is possible to change the default serverity-level of Notifications for a Service?

What do you mean exaclty?
Do you mean the severity if you sent an alert to event console?
Notification also at warning of a service?

My Intention was to change the threshold for WARNING and CRITICAL for the NTP Service for a set of Servers.

But meanwhile I found the Rule I have to apply for it:

I had to create a Rule State of NTP time synchronisation with the desired threshold and a label selector for the hosts.

I don’t know why I did not find it in the first place, but thank you a lot for your reply.