Trac https://trac.torproject.org/projects/tor/ticket/32888 describes that "we should also log [for] IPv4 and IPv6: the Address torrc option" and as tor(1) states, 'Address' takes only an IPv4 address and port.
So what is suggested here? Make 'Address' support IPv6 to be consistent with other options ('ORPort', 'SocksPort', 'TransPort', 'DNSPort', and the like all support multiple declarations per torrc, both IPv4 and IPv6)? If we will have IPv6-only relays in the future, this option would make quite a bit of sense.
Since I'm on the topic of #32888, I went ahead and pushed the IPv6 logging portion to https://github.com/torproject/tor/pull/1932 and have tested with 'ORPort [::1]:9001' and it seems to log successfully. Not a big change, so I expect it to be an easy merge.
Caitlin