[To dev/1.3] Fix ThreadPool Metric NPE

[OneSizeFitsQuorum]

No description provided.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

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

Project coverage is 41.35%. Comparing base (7d369ee) to head (b0923b1).
Report is 2 commits behind head on dev/1.3.

Files with missing lines	Patch %	Lines
...he/iotdb/commons/concurrent/ThreadPoolMetrics.java	0.00%	15 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             dev/1.3   #14460      +/-   ##
=============================================
- Coverage      41.36%   41.35%   -0.01%     
  Complexity       185      185              
=============================================
  Files           3507     3507              
  Lines         224652   224662      +10     
  Branches       26713    26713              
=============================================
- Hits           92924    92913      -11     
- Misses        131728   131749      +21     

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