Description of problem:

00:05:04,064 WARN  [org.rhq.server.metrics.aggregation.PastDataAggregator] (StorageClientThreadPool-2) There was an error aggregating data: java.lang.IllegalArgumentException
        at com.google.common.base.Preconditions.checkArgument(Preconditions.java:76) [guava-14.0.1.jar:]
        at org.rhq.server.metrics.aggregation.CombinedMetricsIterator.<init>(CombinedMetricsIterator.java:28) [rhq-server-metrics-4.12.0.jar:4.12.0]
        at org.rhq.server.metrics.aggregation.PastDataAggregator$3$1.iterator(PastDataAggregator.java:370) [rhq-server-metrics-4.12.0.jar:4.12.0]
        at org.rhq.server.metrics.aggregation.BaseAggregator$2.apply(BaseAggregator.java:283) [rhq-server-metrics-4.12.0.jar:4.12.0]
        at org.rhq.server.metrics.aggregation.BaseAggregator$2.apply(BaseAggregator.java:279) [rhq-server-metrics-4.12.0.jar:4.12.0]
        at com.google.common.util.concurrent.Futures$1.apply(Futures.java:720) [guava-14.0.1.jar:]
        at com.google.common.util.concurrent.Futures$ChainingListenableFuture.run(Futures.java:859) [guava-14.0.1.jar:]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_40]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_40]
        at java.lang.Thread.run(Thread.java:724) [rt.jar:1.7.0_40]

This is thrown after doing an upgrade from RHQ 4.9 to 4.12


Version-Release number of selected component (if applicable): 4.12


How reproducible: Unclear