Is there a way to remove (not dismiss) old alerts?

[ObiTobi]

Hi,

10 days ago as I patched my Windows DC, Freenas cams with alert "Active Directory Domain "DomainName" is Offline."
But I can't find how I can completely remove this message.

 

[eLogicMaker]

Also it seems that if you dismiss an alert, you won't get notified in the future for the same alert.