BewareMyPower commented on issue #1010:
URL: 
https://github.com/apache/pulsar-client-go/issues/1010#issuecomment-1517471136

   The processing time actually records the time that a message id is 
processed. By default, the batch index ACK is  disabled, so
   1. If the message is not batched, the processing time is nearly 0.
   2. Otherwise, given the batch size `N`, the processing time is the interval 
that started when the 1st message in the batch was received and finished when 
all `N` messages were acknowledged.
   
   I think this metric name is somehow not accurate and confusing.
   
   BTW, I found when batch index ACK is enabled, this metric won't be updated. 
And currently the `Reader` interface does not support the batch index ACK yet.


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