@Override
      public boolean evaluate() throws Exception {
        int numReports = getRegionReportsForTable(quotaManager.snapshotRegionSizes(), tn);
        LOG.debug("Saw " + numReports + " reports for " + tn + " while waiting for 1");
        return numReports == 1;
      }
A test case to verify that region reports are expired when they are not sent.
hbase-server/src/test/java/org/apache/hadoop/hbase/quotas/TestQuotaObserverChoreRegionReports.java