STEPS TO REPRODUCE 1. Create a bridge and add an ethernet interface. 2. Set a fixed IP or DHCP for the bridge and bring it up. 3. Try to add the bridge in System monitor. OBSERVED RESULT The bridge is not available for monitoring of its IP address in System monitor. EXPECTED RESULT Bridge should be.
This is intentional, we only show actual physical interfaces since with things such as Docker you easily end up with way too many interfaces to select from, many of which are fairly useless. That said, we should at some point add configuration so that you can force an interface to show up, so that it becomes possible to also monitor virtual interfaces if desired.