feat: revise metrics code

[Yisaer]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 96.29630% with 1 line in your changes missing coverage. Please review.

Project coverage is 71.35%. Comparing base (4f2b159) to head (844beee).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/server/rule_init.go	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3430      +/-   ##
==========================================
+ Coverage   71.33%   71.35%   +0.02%     
==========================================
  Files         411      412       +1     
  Lines       47112    47108       -4     
==========================================
+ Hits        33607    33612       +5     
+ Misses      10878    10873       -5     
+ Partials     2627     2623       -4     

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