public static HostUpdateEvent createHostStateUpdate(String clusterName, String hostName, HostState hostState,
                                                       Long lastHeartbeatTime) {
    return new HostUpdateEvent(clusterName, hostName, null, hostState, lastHeartbeatTime, null, null);
  }
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