[ISSUE #9282] Optimize BrokerController#printWaterMark

[yx9o]

Fixes #9282 .

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.

Project coverage is 48.00%. Comparing base (729275c) to head (9de127a).

Files with missing lines	Patch %	Lines
...a/org/apache/rocketmq/broker/BrokerController.java	0.00%	15 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #9283      +/-   ##
=============================================
- Coverage      48.10%   48.00%   -0.10%     
+ Complexity     12121    12095      -26     
=============================================
  Files           1322     1322              
  Lines          93139    93145       +6     
  Branches       11943    11943              
=============================================
- Hits           44806    44716      -90     
- Misses         42801    42880      +79     
- Partials        5532     5549      +17     

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