Disable multi dimensional alert for one alert rule

Hello,
I would like to know if it is possible to disable multi dimensional alerts without using classic condition. I use a Math expression to check for my alert condition which is very handy. I have multiple instances of the alert (and therefore multiple alert notifications) when I really need to be notified once when one of the instance is firing.

Hi @rorfis

Couldn’t you just adjust your alert query to include ONLY the instance that you want to alert on?

Hi,
No I actually want one alert if one or multiple instance are firing, no matter the instance.