Metrics plugin

[YIDWang]

Issues associated with this PR

迁移 metrics 接口到 API 仓库

[codecov[bot]]

Codecov Report

Base: 60.60% // Head: 60.40% // Decreases project coverage by -0.19% :warning:

Coverage data is based on head (72800d8) compared to base (d8b4e3d). Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2124      +/-   ##
==========================================
- Coverage   60.60%   60.40%   -0.20%     
==========================================
  Files         422      417       -5     
  Lines       36646    36532     -114     
==========================================
- Hits        22208    22068     -140     
- Misses      12259    12286      +27     
+ Partials     2179     2178       -1     

Impacted Files	Coverage Δ
pkg/metrics/store.go	82.60% <ø> (ø)
...aulttolerance/regulator/invocation_stat_factory.go	85.00% <0.00%> (-15.00%)	:arrow_down:
pkg/stream/stream.go	46.66% <0.00%> (-13.34%)	:arrow_down:
pkg/stream/xprotocol/connpool_pingpong.go	50.00% <0.00%> (-12.11%)	:arrow_down:
pkg/stream/http2/var.go	58.69% <0.00%> (-3.81%)	:arrow_down:
pkg/filter/stream/ipaccess/stream_filter.go	84.37% <0.00%> (-2.73%)	:arrow_down:
pkg/router/handler.go	57.14% <0.00%> (-2.12%)	:arrow_down:
pkg/filter/stream/transcoder/filter.go	4.87% <0.00%> (-0.26%)	:arrow_down:
pkg/network/connection.go	40.12% <0.00%> (-0.17%)	:arrow_down:
pkg/stream/http/stream.go	35.09% <0.00%> (-0.15%)	:arrow_down:
... and 43 more

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[nejisama]

api is already merged. pls update this pr. @YIDWang

[YIDWang]

api is already merged. pls update this pr. @YIDWang

update done