When configuring the HTTP Listener for the default intermediary profile in Aurea Monitor Intermediary (AI) under Configuration -> Network -> Profile -> default_intermediary_profile -> HTTP/S Listeners you are able to add only a single host for a given port under the Hostname for the Network Adapter.
You would like to know how to add multiple hostnames because you have multiple AI instances with different hostnames which all use the same port 8080.
You don't need to enumerate all the hosts where your AI will be deployed in your default_intermediary_profile.
The naming for this parameter (hostname) is a bit misleading: not hostname is expected here, but network adapter (interface name) if you want to bind your HTTP connection to specific network adapters on your hosts.
If you don't want to bind your HTTP listeners to specific network adapters then keep the hostname blank. It will bind to all the network interfaces and work for all the AI instances (hosts).