fix: add shared connection log

[Yisaer]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 96.96970% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 70.69%. Comparing base (0bfb7fc) to head (17e7952).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/io/mqtt/conn.go	90.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4030      +/-   ##
==========================================
- Coverage   70.71%   70.69%   -0.02%     
==========================================
  Files         459      459              
  Lines       53324    53355      +31     
==========================================
+ Hits        37708    37717       +9     
- Misses      12687    12700      +13     
- Partials     2929     2938       +9     

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