In WATO in a host or folder you can assign contact groups to hosts.
The new checkbox Always add host contact groups also to its services
allows you now to also assign these groups to the services of the host.
Here is some explanation from the online help:
With this option contact groups that are added to hosts are always being
added to services, as well. This only makes a difference if you have assigned
other contact groups to services via rules in Host & Service Parameters. As
long as you do not have any such rule a service always inherits all contact
groups from its host.
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