Parent/child notification configuration issue

[n3m0]

CMK version: OMD - Open Monitoring Distribution Version 2.2.0p10.cee
**OS version:**Ubuntu 22.04.3 LTS

Description:
I configured mail notifications for my whole team. Unfortunately if for example the firewall of site A is offline we receive a bunch of mails for every system in the site which the corresponding state (down/unreachable).

What I would expect is that only the notification for the parent host will be triggered and the child hosts will get unreachable but there shouldn’t be a notification about that state change (up → unreachable).

That is my current notification rule.

I know I could just enable match host event type and untick state change up → unreachable, but in the docs it is mentioned that it should suppress unreachable notifications automatically and I would like to understand the logic behind correctly:
https://docs.checkmk.com/latest/en/monitoring_basics.html#parents
https://docs.checkmk.com/latest/en/notifications.html#parents

Thanks in advance for any help

[elias.voelker (EliasV)]

hi @n3m0

you are right, this is what should (or rather ‘should not’) happen.

Could you show configuration of the notification rule what host state changes trigger a notification? Could it be that the “ANY → UNREACHABLE” box is checked?

[n3m0]

Hi @elias.voelker,

tbh I’m glad your saying that this shouldn’t be happening

So the configuration of the notification rule looks a bit empty:

I created for each site a contact group and assigned each user the corresponding group. For global admins there is the group everything so they get notified about any issue/problem. And there we only excluded some hosts and some services, but there is no configuration for the host event types in place.

[elias.voelker (EliasV)]

Can you check the “Match Host Event Type” box and show what is checked there?

[n3m0]

If I check the box it looks like this:

edit: If I create a new rule it looks like this: