A custom Management Pack with a rule matching an event in the Application log isn’t generating any alerts.
Event ID 11903
Looking in the OperationsManager Event log on the monitored server I found a error with ID 11903.
This indicates that the there is a wrong datatype. A quick look in the Authoring Console shows that the matching value for the Event Level is wrong and set to a string. In the below screenshot I’ve changed the value.
After importing the MP I got the same error. Deleting it from the Management Group and importing it again solved the issue.