CMK version: 2.2.0p24
OS version: Debian 12
Let me describe this issue.
I have very simple rules to apply labels on services:
Yet, some services pass this labels to notifications rules and some don’t
In notify.log it looks like this:
no label passed
2024-06-11 14:35:41,318 [15] [cmk.base.notify] -> does not match: The service labels {'notify': 'admin-linux-it'} did not match {}
label passed
does not match: The service labels {'notify': 'admin-microsoft-it'} did not match {'notify': 'admin-linux-it'}
From the UI all services has labels “admin-linux-it”.
This is very problematic, because my notification rules base on labels and I just do not receive CRITs alerts 
How to troubleshoot it further?