Expose metrics port for helm installation

[whitewindmills]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:

Which issue(s) this PR fixes:
part of #5166

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[whitewindmills]

/cc @RainbowMango @chaosi-zju

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.23%. Comparing base (ae45a5a) to head (bc5f2a6).
Report is 2 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5168   +/-   ##
=======================================
  Coverage   28.23%   28.23%           
=======================================
  Files         632      632           
  Lines       43566    43566           
=======================================
+ Hits        12302    12303    +1     
  Misses      30365    30365           
+ Partials      899      898    -1     

Flag	Coverage Δ
unittests	28.23% <ø> (+<0.01%)	⬆️

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[RainbowMango]

/lgtm
/approve
Thanks.

[karmada-bot]

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