Prop 313: 8.2. Test IPv6 Stats on the Tor Network
We want to test the IPv6 connection and bandwidth statistics on the public network, with a small number of relays and bridges.
See proposal 313, section 8.2, public tor network tests part: https://gitweb.torproject.org/torspec.git/tree/proposals/313-relay-ipv6-stats.txt#n355