MaksYermak commented on PR #39711:
URL: https://github.com/apache/airflow/pull/39711#issuecomment-2120222492

   > > It is needed to fix the issue in acknowledged functionality in 
deferrable mode.
   > 
   > If this is a bug fix then we should have a unit test to avoid regression
   
   Previously it was a problem in bad trigger design. In that design wasn't 
included that acknowledge ids exist only 10 seconds after pull. This creates an 
issue for users when the trigger passes successfully, but on PubSub service in 
Google Cloud they still have messages. It happens for users, because PubSub's 
trigger sleep after the pull command and then on the acknowledged stage trigger 
acknowledges the expired ID. I do not see how we can cover this case by unit 
test.


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