_confirm_delivery possibly unnecessary warning

[Luminaar]

In class Channel, method _confirm_delivery logs a warning if delivery tag is confirmed. If I understand correctly, this is not an error and it's not something I need to be worried about. But I'm seeing a fair amount of these warnings in logs. Could this messages be a level INFO? I'd rather not suppress all warning logs from that module.

[mosquito]

I guess that you are doing something wrong. The fact is that the confirmation object is asyncio.Future, and when confirmation frame comes from the broker, it turns out that the future is already in the done state.