Inbound events written to the inbox.
Redeliveries the inbox recognised (already done / in flight).
Journaled events processed again (restart recovery, background retry).
Inbound events dead-lettered after inbox.maxAttempts.
Sends written to the outbox.
Sends answered from the outbox without calling the provider (already sent).
Provider attempts beyond the first.
Sends handed to the background sweeper (SendDeferredError).
Sends dead-lettered.
Sends whose outcome was unknown after a crash.
Sends that bypassed the outbox (unencodable or larger than maxPayloadBytes).
Completions rejected because their lease had been superseded.
Replayed sends whose content differed from the one recorded under the same derived key.
Counters behind
bot.durability.metrics().