There are a total of 4 VMwarePerformance Agents, but 1 VMwarePerformance Agent is not collecting data. The following can be seen within the problematic agent log file:
YYYY-MM-DD HH:MM:SS.SSS ECHO <VMwarePerformance/5.6.3/VMwarePerformance/VC01.DOMAIN.COM-agent> ERROR [Quartz-2] com.quest.agent.esx.ESXAgent - Error during attempt to run a collection task
java.lang.IllegalThreadStateException
Unknown.
A deactivation and reactivation of the VMware Performance Agent should help to resolve this issue. If the issue persists after attempting this, please open a new service request via the Support Portal at support.quest.com.