For the Unifi integration, please add an sensor entity to track whether the USG3 is connected to the primary WAN1 (eth0 physical interface) ISP or to WAN2 (eth2 physical interface) when the USG3 router is configured to use WAN2 as Failover (versus load balance).
This is important to provide notification/alerts when the system switches to and from the Failover connection.
It would also be good to have a Switch entity to force disabling of the Failover connection (or perhaps more generally disabling of either eth0 or eth2).