@VisibleForTesting
  public int getClusterMetricsFailedRetrieved() {
    return numGetClusterMetricsFailedRetrieved.value();
  }
@Test
  public void testGetClusterMetricsFailed() {
    long totalBadbefore = metrics.getClusterMetricsFailedRetrieved();
    badSubCluster.getClusterMetrics();
    Assert.assertEquals(totalBadbefore + 1,
        metrics.getClusterMetricsFailedRetrieved());
  }