Technoboy- opened a new pull request #11500:
URL: https://github.com/apache/pulsar/pull/11500


   ### Motivation
   Currently, there is no visibility about the following activities:
   - How many bytes are written from a cursor update?
   - How many bytes are read from loading a cursor?
   So when the bookkeeper cluster is having heavy traffic, it is hard to tell 
which topic or namespace contributes most of the traffic.
   
   Add metrics at the broker about how many bytes are written and read per 
cursor/namespace.
   
   ### Modifications
   Add metrics `writeLedgerSize`, `writeLedgerLogicalSize`, `readLedgerSize`.
   
   
   


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