UI today gets information on the roles that are installed on hosts along with the configurable settings that are pushed down to each of them through resmgr APIs.
In case of neutron, we know which physnet label is mapped to which bridge. We could highlight the host that does not match config with other hosts in the same region/host-aggregate as "Weird" or "Config Different host" by using a different color for that host row on infra page.
This will prevent user-misconfiguration and the following ugly product experiences (having to reach support for something a customer thinks should work).
Host 1: vmnetwork br-vlan and external br-ext
Host 2: same as host 1
Host 3: vmnetwork br-ext (Highlight this host)