@Override
  public boolean isCollectorComponentLive(String clusterName, MetricsServiceProvider.MetricsService service) throws SystemException {
    return metricHostProvider.isCollectorComponentLive(clusterName, service);
  }
I'm a special {@link MetricHostProvider} that can override default component host names.
ambari-server/src/main/java/org/apache/ambari/server/controller/internal/OverriddenMetricsHostProvider.java