Nagios Support Forum

In CCM, get the Services list, edit an existing service, and click the Manage Hosts button.

It shows Host Options of +, standard and Null.

What do these mean/do? How do I use them?

The Documentation drop down doesn't mention them anywhere that I can find.

You can view the documentation on them easier through the "Legacy CCM," Configure > Legacy CCM. Here, select Services > "Service Name" then click the blue question mark next to "+, standard, null" under the hosts list.