Filter filters out all relay addresses.

WithBackoff sets the time we wait after failing to obtain a reservation with a candidate.

WithBootDelay set the boot delay for finding relays.

WithCircuitV1Support enables support for circuit v1 relays.

WithMaxAttempts sets the number of times we attempt to obtain a reservation with a candidate.

WithMaxCandidates sets the number of relay candidates that we buffer.

WithMinCandidates sets the minimum number of relay candidates we collect before to get a reservation with any of them (unless we've been running for longer than the boot delay).

WithNumRelays sets the number of relays we strive to obtain reservations with.

DefaultRelays are the known PL-operated v1 relays; will be decommissioned in 2022.