fix: fix kafka sinke metrics

[Yisaer]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 22.22222% with 7 lines in your changes missing coverage. Please review.

Project coverage is 71.12%. Comparing base (4cb8280) to head (d778647).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
extensions/impl/kafka/sink.go	22.22%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3549      +/-   ##
==========================================
+ Coverage   71.08%   71.12%   +0.04%     
==========================================
  Files         417      417              
  Lines       48138    48120      -18     
==========================================
+ Hits        34217    34222       +5     
+ Misses      11242    11221      -21     
+ Partials     2679     2677       -2     

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