http://ideas.nagios.org/a/dtd/Cluster-objects/18903-3955

The current set of objects is too limited to keep the number of host and service groups manageable. While we can't override the host/service information links in any practical manner to fake deeper tree structures, the benefits of using check_cluster plugin are debatable. (Check on clustered service - you can see that there is a problem, but what does the cluster consist of?)

I would really like to see a possibility to create these objects: host_cluster, service_cluster. Otherwise as host/service objects, but consisting of host or service members and rules on when to switch states.