VMware vCenter Server Appliance 7.0.x
This KB can be used if Alarm definition are deleted manually and we want to restore to default Alarms.
1.To restore the default vCenter Server alarms, remove all existing alarm definitions set the value of "alarms.versionEx" to "-1" on the Advanced settings of the vCenter Server
2. Restart vpxd service
Note: Ensure to create the custom alarms manually.
Before proceeding further take a snapshot of the vCenter server.