add PAPI metrics

[blotus]

No description provided.

[github-actions]

@blotus: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

Details

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[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.30%. Comparing base (fc1677b) to head (79773ad).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/apiserver/papi.go	0.00%	3 Missing ⚠️
pkg/metrics/metrics.go	50.00%	2 Missing ⚠️
pkg/longpollclient/client.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4411      +/-   ##
==========================================
- Coverage   63.31%   63.30%   -0.01%     
==========================================
  Files         476      476              
  Lines       33796    33802       +6     
==========================================
+ Hits        21398    21399       +1     
- Misses      10262    10266       +4     
- Partials     2136     2137       +1     

Flag	Coverage Δ
bats	46.57% <25.00%> (-0.06%)	⬇️
unit-linux	36.25% <0.00%> (+0.06%)	⬆️
unit-windows	24.89% <0.00%> (-0.02%)	⬇️

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