add sandboxSet Prometheus metrics

[ZhaoQing7892]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.90%. Comparing base (f647942) to head (4e600f0).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/controller/sandboxset/sandboxset_controller.go	50.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #223   +/-   ##
=======================================
  Coverage   61.90%   61.90%           
=======================================
  Files         104      105    +1     
  Lines        6694     6702    +8     
=======================================
+ Hits         4144     4149    +5     
- Misses       2285     2288    +3     
  Partials      265      265           

Flag	Coverage Δ
unittests	61.90% <62.50%> (+<0.01%)	⬆️

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[furykerry]

/lgtm
/approve

[kruise-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: furykerry

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