xzhang2sc commented on issue #32461:
URL: https://github.com/apache/beam/issues/32461#issuecomment-2353555240

   I found it's able to acknowledging old messages after I got the permission 
to access pubsub metrics. However, the number is not adding up. 
   
   In the past 30 minutes, the ack message count stays well about 150/s, in 
total it should've ack'ed 150 * 60 * 30 = 270k messages, but the unacked 
messages only dropped 8k. The publish rate is about 10/s, which is negligible. 
   
   <img width="652" alt="Screenshot 2024-09-16 at 10 42 08 AM" 
src="https://github.com/user-attachments/assets/2ed2343f-5fc5-4e74-bc68-d3419678a14d";>
   
   


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