Within the Spotlight console you see the AD health control that is showing that one or more of the AD domain controller servers are not in the same site as the Exchange server.
This is set with consideration of replication speeds. Microsoft best-practice is to have AD servers in the same windows site as the Exchange Server to avoid replication issues with the domain.
If your Exchange site does not have an AD domain controller in it then the metric can be disabled by doing the following:
