I've recently had a look into Infinity Portal under Asset Management and filtered a specific OU.
After deselecting only "active" clients - I've found that one system which is still running with CPHE installed was missing. And not only as active client - it is completely gone, even if it should be synced as "inactive" object from Active Directory.
I guess this has something to do that this server was recently cloned to a new VM (no sysprep). The new VM is running just fine - just the source VM silently vanished from the Infinity Portal without notice. Is there a way to get a warning when systems disconnecting or vanishing from your management Server aka Infinity Portal?