@VisibleForTesting
  public int getNodeToLabelsFailedRetrieved() {
    return numGetNodeToLabelsFailedRetrieved.value();
  }
@Test
  public void testGetNodeToLabelsFailed() {
    long totalBadBefore = metrics.getNodeToLabelsFailedRetrieved();
    badSubCluster.getNodeToLabels();
    Assert.assertEquals(totalBadBefore + 1, metrics.getNodeToLabelsFailedRetrieved());
  }