To get a quick report on what muted/suppressed alerts you have in your implementation:
Adding a 'Custom Query' resource to your view;
Add the following SWQL:
Select A.caption as Node,
A.DetailsURL as [_LinkFor_Node],
SQ.SuppressFrom,
SQ.SuppressUntil
From Orion.Nodes A
right JOIN
( SELECT ID, substring(EntityUri,53,4) as NodeID, SuppressFrom, SuppressUntil
FROM Orion.AlertSuppression a) AS SQ on SQ.NodeID = A.NodeID
ORDER BY SuppressUntil
I hope this helps you as much as it has helped us.