private String getMetricsCollectorHostName(String clusterName)
    throws SystemException {

    checkAndAddExternalCollectorHosts(clusterName);
    String currentCollectorHost = metricsCollectorHAManager.getCollectorHost(clusterName);
    LOG.debug("Cluster Metrics Vip Host : " + clusterMetricserverVipHost);

    return currentCollectorHost;
  }
Get type of Metrics system installed.
@return @MetricsService, null if none found.
ambari-server/src/main/java/org/apache/ambari/server/controller/internal/AbstractProviderModule.java