fix: send on close channel

[wy-lucky]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 33.63%. Comparing base (2234da6) to head (6bbe8ab).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../registry/hpaaggregator/aggregation/forward/pod.go	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #343      +/-   ##
==========================================
- Coverage   33.63%   33.63%   -0.01%     
==========================================
  Files         156      156              
  Lines       18048    18052       +4     
==========================================
  Hits         6071     6071              
- Misses      11456    11460       +4     
  Partials      521      521              

Flag	Coverage Δ
unittests	33.63% <0.00%> (-0.01%)	⬇️

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