Create a "host1" which belongs to "host group one". Create "host2" which belongs to "host group two":

Create a new media type - webhook to create a new menu entry. To make webhook functional we must define all media types:

Create new service user which will execute this webhook:

Define a new action which match only "host group one":

Create the problem for "host1" and "host2". The action is executed only for "host1", everything is correct:

A new menu entry is available for "host1", that is correct:

A new menu entry is available also for "host2". This should not be there, because action was not executed there: