GitHub user alpreu added a comment to the discussion: unackedMessages vs 
msgBacklog in stats

The message backlog tracks the 'outstanding' messages in the subscription that 
are yet to be processed, while the `unackedMessages` tracks the messages that 
are sent to a consumer but have not been ack'd yet

GitHub link: 
https://github.com/apache/pulsar/discussions/23159#discussioncomment-10333832

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