I've been running this query to find applications we are alerting on and which components:
select ao.AlertID, apm.Name as Application, ac.Name as Alert, apc.Name as Component
from AlertConfigurations ac
join AlertObjects ao on ao.AlertID = ac.AlertID
join APM_Application apm on apm.Uri = ao.EntityUri
join APM_Component apc on apc.ApplicationID = apm.ID
where ac.ObjectType like '%Application%' and ac.Enabled like '1'
Order by ac.Name, apm.Name