@Override
  protected String getZookeeperQuorum() {
    //Ignoring Zk Fallback.
    return null;
  }
Get the zookeeper quorum for the cluster used to find collector

@return String "host1:port1,host2:port2"
ambari-server/src/main/java/org/apache/ambari/server/metrics/system/impl/AmbariMetricSinkImpl.java