Using DNS names in Config.AdvertiseAddr

I am wondering why you cannot use a DNS name for the `AdvertiseAddr` in the config. Is there a reason for this? Would that mean have to do the name resolution myself before giving it to the memberlist config?

Here it expects that the `AdvertiseAddr` is an actual IP address:
https://github.com/hashicorp/memberlist/blob/b195c8e4fcc6284fff1583fd6ab09e68ca207551/memberlist.go#L369-L373

Start by reading memberlist.go around lines 369-373, where AdvertiseAddr is expected to be an IP address, and trace how that value is validated and consumed. Determine the intended behavior for DNS names, including when resolution should occur; done requires an agreed behavior with corresponding tests or documentation.

Written by the indexing model from the issue text.