sijie opened a new issue #6045: [Broker] Provide a way to retrieve the real 
msgBacklog value
URL: https://github.com/apache/pulsar/issues/6045
 
 
   *Motivation*
   
   Currently, the broker exposes `msgBacklog` to topic & subscription stats. 
However, this value is an *estimated* value by calculation based on 
*numProduced* and *numConsumed* seen by a broker since it starts. This value is 
an estimated value. 
   
   We can consider providing a way to retrieve the real msgBacklog value from 
the storage or providing a tool to force load the metric into topic & 
subscription stat. 

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