Comment 5 for bug 1736050

It's still unclear to me what "binding" means and is used by Juju. I think it's the endpoint of the provided relation (per above, "network-get nrpe-external-master").

I think you're right that it could be "when guessing what IP to use, prefer the IP associated with the default gateway". It's better than what it is right now of "when guessing what IP to use, use *the IP of the first non-loopback interface*".