These are the same in cases where there was no triggering message. We discard
a peering message if the message's query_epoch if the PG in question has entered
a new epoch (See PG::old_peering_evt, PG::queue_peering_event). Notifies,
-infos, notifies, and logs are all handled as PG::RecoveryMachine events and
+infos, notifies, and logs are all handled as PG::PeeringMachine events and
are wrapped by PG::queue_* by PG::CephPeeringEvts, which include the created
state machine event along with epoch_sent and query_epoch in order to
generically check PG::old_peering_message upon insertion and removal from the