You have accidentally removed some hosts or services from the Hosts or Services page and you cannot re-add them back as the "+" sign is no longer visible.
In some cases, the drop-down menu for the Host Type: in the Install Services window may not display the desired service. e.g. Malware Analysis is not a selectable option for the newly re-imaged Malware host.
In order to re-add the host or services, please perform the following:
Obtain the uuid for the host by running the following command from the host.
# cat /etc/salt/minion
Note: The output from other hosts will show the IP address of the Admin Server for master:.
From the Admin Server, run the orchestration client to add the missing host back.
Note: This step is only required if the host does not exist under the Hosts page. If the Hosts page shows the host, please skip this step and continue from step