An address was confirmed not to be externally dialable, carrying the tally for the round that reached the failure threshold.
Emitted as each peer contributes a dial result for an address, carrying the running success/failure tally for the current round. A verdict (reachable/unreachable) is not guaranteed to follow.
An address was confirmed to be externally dialable. Carries the tally for the current round, which is zero when an address is re-affirmed under connection pressure without probing.