feat: update connection api and doc

[Yisaer]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 70.86%. Comparing base (17e4dc3) to head (a72b798).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/connection/pool.go	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3242      +/-   ##
==========================================
+ Coverage   70.85%   70.86%   +0.01%     
==========================================
  Files         395      395              
  Lines       44333    44335       +2     
==========================================
+ Hits        31409    31417       +8     
+ Misses      10431    10427       -4     
+ Partials     2493     2491       -2     

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