zbentley commented on issue #15609:
URL: https://github.com/apache/pulsar/issues/15609#issuecomment-1128881542

   @Technoboy if a consumer is not acking a message, how come Prometheus 
reports no messages in backlog, and a zero or negative backlog size? Similarly, 
it reports no subscription backlogs. That also wouldn't explain why unloading 
the topic solves the problem.
   
   Grafana screenshots below:
   <img width="1394" alt="Screen Shot 2022-05-17 at 9 36 13 AM" 
src="https://user-images.githubusercontent.com/10999109/168823935-7d088ecf-8693-4847-b2f1-9035ccd87447.png";>
   
   <img width="1716" alt="Screen Shot 2022-05-17 at 9 35 37 AM" 
src="https://user-images.githubusercontent.com/10999109/168823920-95a5b9af-f44a-4eb6-9bf3-1665a56b49a5.png";>


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