As a part of BZ1853906, BZ1925025 and BZ1924823 we have add the option to reboot a host after adding a new host, reinstalling existing host and approving a host. This new option should be added into the following chapter:

https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.4/html/administration_guide/sect-host_tasks#Host_General_Settings

There should also be added a note that, rebooting a host after host deploy is turned on by default, but rebooting a host after host deploy is really required for below use cases:

1. Changing kernel command line parameters of the host
2. Changing firewall type of the cluster

For other usecases is recommended to reboot a host after host deploy, but of course administrator can turn it off