We ran into an issue where our custom alarms in vCenter weren’t generating alerts after upgrade to vCenter 4.1. All of our existing alarms that were defined in vCenter 4.0 were still in place after the upgrade. However, alarming was inconsistent. We had one alarm defined on a single folder, some of the datastores that met the alert criteria were alarming, some of them weren’t.
I deleted the alarm definition and recreated it, all of the datastores that should have been alarming lit up… I have a ticket open with VMware support. At this point I’m not sure if I’m going to have to manually rebuild all of our alarms.