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There should be a separate description (in the alerts overview or as an extended example) that defines recovery alerts and has use cases for using them. (One good use case is for drift remediation.)
A link: http://rhq-project.org/display/RHQ/Alerts#Alerts-Recovery
Added an example: http://docs.redhat.com/docs/en-US/JBoss_Operations_Network/3.1/html/Admin_Setting_up_Monitoring_Alerts_and_Operations/alert-conditions.html#recover-alerts