@Override
    public void transition(HostImpl host, HostEvent event) {
      HostStatusUpdatesReceivedEvent e = (HostStatusUpdatesReceivedEvent)event;
      // TODO Audit logs
      LOG.debug("Host transition to host status updates received state, host={}, heartbeatTime={}", e.getHostName(), e.getTimestamp());
      host.setHealthStatus(new HostHealthStatus(HealthStatus.HEALTHY,
        host.getHealthStatus().getHealthReport()));
    }
Used to publish events relating to host CRUD operations.
ambari-server/src/main/java/org/apache/ambari/server/state/host/HostImpl.java