public static HostUpdateEvent createHostMaintenanceStatusUpdate(String clusterName, String hostName,
                                                                  MaintenanceState maintenanceState,
                                                                  AlertSummaryDTO alertsSummary) {
    return new HostUpdateEvent(clusterName, hostName, null, null, null, maintenanceState, alertsSummary);
  }
Host info with updated parameter. This update will be sent to all subscribed recipients.
ambari-server/src/main/java/org/apache/ambari/server/events/HostUpdateEvent.java