Hi aaustin1,
you can create your own alert which will inform you that VMs are unreachable. Here's an example of an alert which is fired when there's no update within last 20 minutes:
So if the performance data collection is older than 20 minutes then the alert is raised.
More info at VMAN Administrator Guide, Alerts section.
Do you want to get more information in the email? You can use the"concat('Last Time: ',/virtualMachine/perfDate, ' [', /virtualMachine/managedByServer, ']')" xpath to Notification value in Notifications tab:
