http://jira.hyperic.com/browse/HHQ-4494
MeasurementCommandsService is logging following DEBUG message as an error. I am not sure if this results in resource missing metric data for that time interval.
2010-12-03 15:50:19,482 DEBUG [Thread-1] [org.hyperic.hq.measurement.agent.server.MeasurementCommandsService@234] Error getting real time measurement 'vm:url=%url%,user=%user%,pass=,vm=%vm%,uuid=%uuid%:cpu.usage.average': Plugin error: VirtualMachine/null: not found
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