Unexpected Alerts are being generated.

Document ID : KB000124577
Last Modified Date : 15/01/2019
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Issue:
End users are getting Introscope alerts that are set up to alert when the JVM disconnects.  When checking the alert, the JVM did not go down, its metrics were switched to another EM Collector in the environment. The alert is configured with combination set to "all", so why the alert is being generated?
Environment:
All APM releases.
Cause:
Invalid agent metric expression that included undesired agents. 
Resolution:
The  incorrect configuration that was causing the problem. There was a wild card in the metric grouping that should not have been there.