All alarms configured in Veeam ONE were deleted by mistake, and you need to get them back.
The steps below will restore all alarms that were ever configured in Veeam ONE and then deleted.
Execute the following SQL script against the Veeam ONE database:
UPDATE monitor.Alarm SET delete_time = NULL
UPDATE monitor.AssignAlarm SET delete_time = NULL
Restart Veeam ONE Monitor Server service.