The following WARN messages are seen in the MOM log when using the Weblogic Powerpack in a cluster environment:
that exists in a Collector: SuperDomain|152101a077|WebLogic|dxxxx0_1_1|WebLogic|JMX Aggregate|EJB Pool:Waiting Thread Count
The above warning messages appear when the Powerpack for Weblogic is configured incorrectly in the cluster environment. However, it is more likely the powerpack jar files are not deployed correctly on the EMs.
To resolve this problem, deploy the "PPWebLogicExtensionPlugins.jar" on the collectors only.
In addition, deploy the extension components "PPWebLogicManagementModule.jar" and "PPWebLogicTypeview.xml" on the MOM only.
NOTE: This is documented in version 9.6 onwards.