StevenLuMT opened a new pull request, #3501:
URL: https://github.com/apache/bookkeeper/pull/3501

   Descriptions of the changes in this PR:
   
   ### Motivation
   
   The latency of the OpStatsLogger.registerSuccessfulEvent calculation is to 
convert the time to milliseconds
   <img width="855" alt="image" 
src="https://user-images.githubusercontent.com/42990025/191929953-bdac2d25-3fbe-4697-b3e9-f4942ed7c074.png";>
   but Counter.add nothing to do
   
   so when using Counter for latency statistics, the time unit and 
OpStatsLogger are not unified,
   then we unified latency metric unit 
   
   ### Changes
   
   1.  change name : Counter.add -->  Counter.addCount
   2. add new method Counter.addLatency to count the time and convert the time 
to milliseconds
   
   then how to use counter correctly:
   1. when using Counter for latency metric, call Counter.addLatency
   2. when using Counter for count metric, call Counter.addCount


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