@Override
    public int hashCode() {
      int result = hostName != null ? hostName.hashCode() : 0;
      result = 31 * result + (gangliaClusterName != null ? gangliaClusterName.hashCode() : 0);
      return result;
    }
Key used to associate information from a Ganglia metric to a resource.
ambari-server/src/main/java/org/apache/ambari/server/controller/metrics/ganglia/GangliaPropertyProvider.java