Right now the only types of calculation that can be done in actions is :

• And/Or
• And
• Or
• custom expression

The latter only supports AND and OR operations, but it would nice if it could also support "NOT".

Use-case:

I'd like to filter out a specific tag value which is applied to multiple hosts in multiple hostgroups but prevent from triggering if the action involves a specific hostgroup and if the trigger tag value is X.