I’m new to checkmk, but there must surely be some bugs in the way the notification delay works.
We found that if you name a host with something other than the FQDN, the delay notifications rule does not apply at all. Notifications are instant.
After switching to FQDN hostnames, the notification delay starts working. However, the delay interval is erratic. When set for 5 minutes, the notifications trigger anywhere between 1min and 39 seconds and up to 5 minutes with most of the notifications triggering between 2 and half to 4 and a half minutes. Its just seriously erratic.
I haven’t seen anyone else complain about the erratic nature. But given that we proved there’s a disparity between FQDNs and non-FQDNs, and the current thread OPs report of a change in behavior between versions, it seems clear that fresh bugs were introduced in recent history.