Microsoft Lync Server 2010 Central Discovery Candidate Watcher Node machine has Central Management Server installed on it, it can possibly be picked by SCOM for Central Discovery.
<ClassType ID="Microsoft.LS.2010.WatcherNode.CentralDiscoveryCandidate" Accessibility="Public" Abstract="false" Base="Windows!Microsoft.Windows.ComputerRole" Hosted="true" Singleton="false"/>