This metric tracks the number of minutes since the most recent restore of the database.
If your log restores aren’t happening when they’re meant to, you want to know about it. You’ll be relying on restoring from logs should anything happen to your databases, and if you can’t restore to a certain point in time, you risk losing valuable data.
For more information about restoring data, see: http://msdn.microsoft.com/en-us/library/ms177446.aspx
Note: This metric works on SQL Server 2000 SP4 and later versions.
Note: An alert can only be raised after at least once restore has occurred.