You'd want / it would be an "at least once" delivery. If you need to restart delivery due to some issue, the consumer might see a message twice; it's not out of order per se, it's just that the delivery/queue system doesn't know for sure whether it got delivered, and is thus redelivering.
The consumer, of course, must be aware of & ready to handle multiple deliveries. (E.g., you keep a "log position" which represents where you've processed the incoming messages up to.) But if you need ordering+not losing messages, it's the mode you need. (Since "at most once" implies "sometimes losing messages".)
The consumer, of course, must be aware of & ready to handle multiple deliveries. (E.g., you keep a "log position" which represents where you've processed the incoming messages up to.) But if you need ordering+not losing messages, it's the mode you need. (Since "at most once" implies "sometimes losing messages".)