feat: metrics middleware use otel metrics

5 changed files with 95 additions and 309 deletions
--- a/go.mod
+++ b/go.mod
@ -3,35 +3,38 @@ module github.com/go-kratos/kratos/v2
 go 1.18

 require (
-	github.com/fsnotify/fsnotify v1.5.4
+	github.com/fsnotify/fsnotify v1.6.0
 	github.com/go-kratos/aegis v0.2.0
 	github.com/go-playground/form/v4 v4.2.0
 	github.com/golang-jwt/jwt/v4 v4.4.1
 	github.com/google/uuid v1.3.0
 	github.com/gorilla/mux v1.8.0
-	github.com/imdario/mergo v0.3.12
-	go.opentelemetry.io/otel v1.7.0
-	go.opentelemetry.io/otel/sdk v1.7.0
-	go.opentelemetry.io/otel/trace v1.7.0
-	golang.org/x/sync v0.0.0-20220513210516-0976fa681c29
-	google.golang.org/genproto v0.0.0-20220519153652-3a47de7e79bd
-	google.golang.org/grpc v1.46.2
-	google.golang.org/protobuf v1.28.0
+	github.com/imdario/mergo v0.3.13
+	go.opentelemetry.io/otel v1.15.1
+	go.opentelemetry.io/otel/metric v0.38.1
+	go.opentelemetry.io/otel/sdk v1.15.1
+	go.opentelemetry.io/otel/trace v1.15.1
+	golang.org/x/sync v0.1.0
+	google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1
+	google.golang.org/grpc v1.54.0
+	google.golang.org/protobuf v1.30.0
 	gopkg.in/yaml.v3 v3.0.1
 )

 require (
-	github.com/go-logr/logr v1.2.3 // indirect
+	github.com/cncf/xds/go v0.0.0-20230310173818-32f1caf87195 // indirect
+	github.com/envoyproxy/go-control-plane v0.11.1-0.20230505175422-aaf76b5f96d0 // indirect
+	github.com/go-logr/logr v1.2.4 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-ole/go-ole v1.2.6 // indirect
-	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/lufia/plan9stats v0.0.0-20230110061619-bbe2e5e100de // indirect
 	github.com/power-devops/perfstat v0.0.0-20221212215047-62379fc7944b // indirect
 	github.com/shirou/gopsutil/v3 v3.23.2 // indirect
 	github.com/tklauser/go-sysconf v0.3.11 // indirect
 	github.com/tklauser/numcpus v0.6.0 // indirect
 	github.com/yusufpapurcu/wmi v1.2.2 // indirect
-	golang.org/x/net v0.7.0 // indirect
-	golang.org/x/sys v0.6.0 // indirect
-	golang.org/x/text v0.7.0 // indirect
+	golang.org/x/net v0.9.0 // indirect
+	golang.org/x/sys v0.7.0 // indirect
+	golang.org/x/text v0.9.0 // indirect
 )
--- a/go.sum
+++ b/go.sum
@ -1,37 +1,25 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
-github.com/census-instrumentation/opencensus-proto v0.2.1 h1:glEXhBS5PSLLv4IXzLA5yPRVX4bilULVyxxbrfOtDAk=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
-github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/census-instrumentation/opencensus-proto v0.4.1 h1:iKLQ0xPNFxR/2hzXZMrBo8f1j86j5WHzznCCQxV/b8g=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
-github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
-github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
-github.com/cncf/udpa/go v0.0.0-20210930031921-04548b0d99d4/go.mod h1:6pvJx4me5XPnfI9Z40ddWsdw2W/uZgQLFXToKeRcDiI=
-github.com/cncf/xds/go v0.0.0-20210922020428-25de7278fc84/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
-github.com/cncf/xds/go v0.0.0-20211001041855-01bcc9b48dfe/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
-github.com/cncf/xds/go v0.0.0-20211011173535-cb28da3451f1 h1:zH8ljVhhq7yC0MIeUL/IviMtY8hx2mK8cN9wEYb8ggw=
-github.com/cncf/xds/go v0.0.0-20211011173535-cb28da3451f1/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
+github.com/cncf/xds/go v0.0.0-20230310173818-32f1caf87195 h1:58f1tJ1ra+zFINPlwLWvQsR9CzAKt2e+EWV2yX9oXQ4=
+github.com/cncf/xds/go v0.0.0-20230310173818-32f1caf87195/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
-github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
-github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
-github.com/envoyproxy/go-control-plane v0.9.9-0.20201210154907-fd9021fe5dad/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
-github.com/envoyproxy/go-control-plane v0.10.2-0.20220325020618-49ff273808a1 h1:xvqufLtNVwAhN8NMyWklVgxnWohi+wtMGQMhtxexlm0=
-github.com/envoyproxy/go-control-plane v0.10.2-0.20220325020618-49ff273808a1/go.mod h1:KJwIaB5Mv44NWtYuAOFCVOjcI94vtpEz2JU/D2v6IjE=
-github.com/envoyproxy/protoc-gen-validate v0.1.0 h1:EQciDnbrYxy13PgWoY8AqoxGiPrpgBZ1R8UNe3ddc+A=
+github.com/envoyproxy/go-control-plane v0.11.1-0.20230505175422-aaf76b5f96d0 h1:NRe/6chqkk5R7QJGvMu+FkzkVniW0QkCUQ0u8L7PtaU=
+github.com/envoyproxy/go-control-plane v0.11.1-0.20230505175422-aaf76b5f96d0/go.mod h1:84cjSkVxFD9Pi/gvI5AOq5NPhGsmS8oPsJLtCON6eK8=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
-github.com/fsnotify/fsnotify v1.5.4 h1:jRbGcIw6P2Meqdwuo0H1p6JVLbL5DHKAKlYndzMwVZI=
-github.com/fsnotify/fsnotify v1.5.4/go.mod h1:OVB6XrOHzAwXMpEM7uPOzcehqUV2UqJxmVXmkdnm1bU=
-github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
+github.com/envoyproxy/protoc-gen-validate v0.9.1 h1:PS7VIOgmSVhWUEeZwTe7z7zouA22Cr590PzXKbZHOVY=
+github.com/fsnotify/fsnotify v1.6.0 h1:n+5WquG0fcWoWp6xPWfHdbskMCQaFnG6PfBrh1Ky4HY=
+github.com/fsnotify/fsnotify v1.6.0/go.mod h1:sl3t1tCWJFWoRz9R8WJCbQihKKwmorjAbSClcnxKAGw=
 github.com/go-kratos/aegis v0.2.0 h1:dObzCDWn3XVjUkgxyBp6ZeWtx/do0DPZ7LY3yNSJLUQ=
 github.com/go-kratos/aegis v0.2.0/go.mod h1:v0R2m73WgEEYB3XYu6aE2WcMwsZkJ/Rzuf5eVccm7bI=
 github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
-github.com/go-logr/logr v1.2.3 h1:2DntVwHkVopvECVRSlL5PSo9eG+cAkDCuckLubN+rq0=
-github.com/go-logr/logr v1.2.3/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
+github.com/go-logr/logr v1.2.4 h1:g01GSCwiDw2xSZfjJ2/T9M+S6pFdcNtFYsp+Y43HYDQ=
+github.com/go-logr/logr v1.2.4/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
 github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
 github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
 github.com/go-ole/go-ole v1.2.6 h1:/Fpf6oFPoeFik9ty7siob0G6Ke8QvQEuVcuChpwXzpY=
@ -46,36 +34,20 @@ github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfU
 github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/golang/protobuf v1.3.3/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw=
-github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8=
-github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA=
-github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs=
-github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
-github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
-github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QDs8UjoX8=
-github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
-github.com/golang/protobuf v1.4.3/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
-github.com/golang/protobuf v1.5.2 h1:ROPKBNFfQgOUMifHyP+KYbvpjbdoFNs+aK7DXlji0Tw=
-github.com/golang/protobuf v1.5.2/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
+github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
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 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
-github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.7/go.mod h1:n+brtR0CgQNWTVd5ZUFpTBC8YFBDLK/h/bpaJ8/DtOE=
 github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
 github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
-github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
 github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
-github.com/grpc-ecosystem/grpc-gateway v1.16.0/go.mod h1:BDjrQk3hbvj6Nolgz8mAMFbcEtjT1g+wF4CSlocrBnw=
-github.com/imdario/mergo v0.3.12 h1:b6R2BslTbIEToALKP7LxUvijTsNI9TAe80pLWN2g/HU=
-github.com/imdario/mergo v0.3.12/go.mod h1:jmQim1M+e3UYxmgPu/WyfjB3N3VflVyUjjjwH0dnCYA=
+github.com/imdario/mergo v0.3.13 h1:lFzP57bqS/wsqKssCGmtLAb8A0wKjLGrve2q3PPVcBk=
+github.com/imdario/mergo v0.3.13/go.mod h1:4lJ1jqUDcsbIECGy0RUJAXNIhg+6ocWgb1ALK2O4oXg=
 github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0/go.mod h1:zJYVVT2jmtg6P3p1VtQj7WsuWi/y4VnjVBn7F8KPB3I=
 github.com/lufia/plan9stats v0.0.0-20230110061619-bbe2e5e100de h1:V53FWzU6KAZVi1tPp5UIsMoUWJ2/PNwYIDXnu7QuBCE=
 github.com/lufia/plan9stats v0.0.0-20230110061619-bbe2e5e100de/go.mod h1:JKx41uQRwqlTZabZc+kILPrO/3jlKnQ2Z8b7YiVw5cE=
@ -85,14 +57,11 @@ github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c/go.mod h1:Om
 github.com/power-devops/perfstat v0.0.0-20221212215047-62379fc7944b h1:0LFwY6Q3gMACTjAbMZBjXAqTOzOwFaj2Ld6cjeQ7Rig=
 github.com/power-devops/perfstat v0.0.0-20221212215047-62379fc7944b/go.mod h1:OmDBASR4679mdNQnz2pUhc2G8CO2JrUAVFDRBDP/hJE=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
-github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=
 github.com/shirou/gopsutil/v3 v3.23.2 h1:PAWSuiAszn7IhPMBtXsbSCafej7PqUOvY6YywlQUExU=
 github.com/shirou/gopsutil/v3 v3.23.2/go.mod h1:gv0aQw33GLo3pG8SiWKiQrbDzbRY1K80RyZJ7V4Th1M=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
-github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
-github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.2 h1:+h33VjcLVPDHtOdpUCuF+7gSuG3yGIftsP1YvFihtJ8=
@ -103,106 +72,67 @@ github.com/tklauser/numcpus v0.6.0 h1:kebhY2Qt+3U6RNK7UqpYNA+tJ23IBEGKkB7JQBfDYm
 github.com/tklauser/numcpus v0.6.0/go.mod h1:FEZLMke0lhOUG6w2JadTzp0a+Nl8PF/GFkQ5UVIcaL4=
 github.com/yusufpapurcu/wmi v1.2.2 h1:KBNDSne4vP5mbSWnJbO+51IMOXJB67QiYCSBrubbPRg=
 github.com/yusufpapurcu/wmi v1.2.2/go.mod h1:SBZ9tNy3G9/m5Oi98Zks0QjeHVDvuK0qfxQmPyzfmi0=
-go.opentelemetry.io/otel v1.7.0 h1:Z2lA3Tdch0iDcrhJXDIlC94XE+bxok1F9B+4Lz/lGsM=
-go.opentelemetry.io/otel v1.7.0/go.mod h1:5BdUoMIz5WEs0vt0CUEMtSSaTSHBBVwrhnz7+nrD5xk=
-go.opentelemetry.io/otel/sdk v1.7.0 h1:4OmStpcKVOfvDOgCt7UriAPtKolwIhxpnSNI/yK+1B0=
-go.opentelemetry.io/otel/sdk v1.7.0/go.mod h1:uTEOTwaqIVuTGiJN7ii13Ibp75wJmYUDe374q6cZwUU=
-go.opentelemetry.io/otel/trace v1.7.0 h1:O37Iogk1lEkMRXewVtZ1BBTVn5JEp8GrJvP92bJqC6o=
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--- a/metrics/metrics.go
+++ b/metrics/metrics.go
@ -1,6 +1,7 @@
 package metrics

 // Counter is metrics counter.
+// Deprecated: use otel metrcis instead.
 type Counter interface {
 	With(lvs ...string) Counter
 	Inc()
@ -8,6 +9,7 @@ type Counter interface {
 }

 // Gauge is metrics gauge.
+// Deprecated: use otel metrcis instead.
 type Gauge interface {
 	With(lvs ...string) Gauge
 	Set(value float64)
@ -16,6 +18,7 @@ type Gauge interface {
 }

 // Observer is metrics observer.
+// Deprecated: use otel metrcis instead.
 type Observer interface {
 	With(lvs ...string) Observer
 	Observe(float64)
--- a/middleware/metrics/metrics.go
+++ b/middleware/metrics/metrics.go
@ -2,37 +2,45 @@ package metrics

 import (
 	"context"
-	"strconv"
 	"time"

 	"github.com/go-kratos/kratos/v2/errors"
-	"github.com/go-kratos/kratos/v2/metrics"
 	"github.com/go-kratos/kratos/v2/middleware"
 	"github.com/go-kratos/kratos/v2/transport"
+	"go.opentelemetry.io/otel/attribute"
+	api "go.opentelemetry.io/otel/metric"
 )

 // Option is metrics option.
 type Option func(*options)

+// WithMeter with meter.
+func WithMeter(m api.Meter) Option {
+	return func(o *options) {
+		o.meter = m
+	}
+}
+
 // WithRequests with requests counter.
-func WithRequests(c metrics.Counter) Option {
+func WithRequests(c api.Int64Counter) Option {
 	return func(o *options) {
 		o.requests = c
 	}
 }

 // WithSeconds with seconds histogram.
-func WithSeconds(c metrics.Observer) Option {
+func WithSeconds(c api.Float64Histogram) Option {
 	return func(o *options) {
 		o.seconds = c
 	}
 }

 type options struct {
+	meter api.Meter
 	// counter: <client/server>_requests_code_total{kind, operation, code, reason}
-	requests metrics.Counter
+	requests api.Int64Counter
 	// histogram: <client/server>_requests_seconds_bucket{kind, operation}
-	seconds metrics.Observer
+	seconds api.Float64Histogram
 }

 // Server is middleware server-side metrics.
@ -43,27 +51,26 @@ func Server(opts ...Option) middleware.Middleware {
 	}
 	return func(handler middleware.Handler) middleware.Handler {
 		return func(ctx context.Context, req interface{}) (interface{}, error) {
-			var (
-				code      int
-				reason    string
-				kind      string
-				operation string
-			)
+			var attributes []attribute.KeyValue
 			startTime := time.Now()
 			if info, ok := transport.FromServerContext(ctx); ok {
-				kind = info.Kind().String()
-				operation = info.Operation()
+				attributes = append(attributes,
+					attribute.String("kind", info.Kind().String()),
+					attribute.String("operation", info.Operation()),
+				)
 			}
 			reply, err := handler(ctx, req)
 			if se := errors.FromError(err); se != nil {
-				code = int(se.Code)
-				reason = se.Reason
+				attributes = append(attributes,
+					attribute.Int("code", int(se.Code)),
+					attribute.String("reason", se.Reason),
+				)
 			}
 			if op.requests != nil {
-				op.requests.With(kind, operation, strconv.Itoa(code), reason).Inc()
+				op.requests.Add(ctx, 1, api.WithAttributes(attributes...))
 			}
 			if op.seconds != nil {
-				op.seconds.With(kind, operation).Observe(time.Since(startTime).Seconds())
+				op.seconds.Record(ctx, time.Since(startTime).Seconds(), api.WithAttributes(attributes...))
 			}
 			return reply, err
 		}
@ -78,27 +85,26 @@ func Client(opts ...Option) middleware.Middleware {
 	}
 	return func(handler middleware.Handler) middleware.Handler {
 		return func(ctx context.Context, req interface{}) (interface{}, error) {
-			var (
-				code      int
-				reason    string
-				kind      string
-				operation string
-			)
+			var attributes []attribute.KeyValue
 			startTime := time.Now()
-			if info, ok := transport.FromClientContext(ctx); ok {
-				kind = info.Kind().String()
-				operation = info.Operation()
+			if info, ok := transport.FromServerContext(ctx); ok {
+				attributes = append(attributes,
+					attribute.String("kind", info.Kind().String()),
+					attribute.String("operation", info.Operation()),
+				)
 			}
 			reply, err := handler(ctx, req)
 			if se := errors.FromError(err); se != nil {
-				code = int(se.Code)
-				reason = se.Reason
+				attributes = append(attributes,
+					attribute.Int("code", int(se.Code)),
+					attribute.String("reason", se.Reason),
+				)
 			}
 			if op.requests != nil {
-				op.requests.With(kind, operation, strconv.Itoa(code), reason).Inc()
+				op.requests.Add(ctx, 1, api.WithAttributes(attributes...))
 			}
 			if op.seconds != nil {
-				op.seconds.With(kind, operation).Observe(time.Since(startTime).Seconds())
+				op.seconds.Record(ctx, time.Since(startTime).Seconds(), api.WithAttributes(attributes...))
 			}
 			return reply, err
 		}
--- a/middleware/metrics/metrics_test.go
+++ b/middleware/metrics/metrics_test.go
@ -1,156 +0,0 @@
-package metrics
-
-import (
-	"context"
-	"errors"
-	"testing"
-
-	"github.com/go-kratos/kratos/v2/metrics"
-	"github.com/go-kratos/kratos/v2/transport"
-	"github.com/go-kratos/kratos/v2/transport/http"
-)
-
-type (
-	mockCounter struct {
-		lvs   []string
-		value float64
-	}
-	mockObserver struct {
-		lvs   []string
-		value float64
-	}
-)
-
-func (m *mockCounter) With(_ ...string) metrics.Counter {
-	return m
-}
-
-func (m *mockCounter) Inc() {
-	m.value += 1.0
-}
-
-func (m *mockCounter) Add(delta float64) {
-	m.value += delta
-}
-
-func (m *mockObserver) With(_ ...string) metrics.Observer {
-	return m
-}
-
-func (m *mockObserver) Observe(delta float64) {
-	m.value += delta
-}
-
-func TestWithRequests(t *testing.T) {
-	mock := mockCounter{
-		lvs:   []string{"Initial"},
-		value: 1.23,
-	}
-	o := options{
-		requests: &mock,
-	}
-
-	WithRequests(&mock)(&o)
-
-	if _, ok := o.requests.(*mockCounter); !ok {
-		t.Errorf(`The type of the option requests property must be of "mockCounter", %T given.`, o.requests)
-	}
-
-	counter := o.requests.(*mockCounter)
-
-	if len(counter.lvs) != 1 || counter.lvs[0] != "Initial" {
-		t.Errorf(`The given counter lvs must have only one element equal to "Initial", %v given`, counter.lvs)
-	}
-	if counter.value != 1.23 {
-		t.Errorf(`The given counter value must be equal to 1.23, %v given`, counter.value)
-	}
-}
-
-func TestWithSeconds(t *testing.T) {
-	mock := mockObserver{
-		lvs:   []string{"Initial"},
-		value: 1.23,
-	}
-	o := options{
-		seconds: &mock,
-	}
-
-	WithSeconds(&mock)(&o)
-
-	if _, ok := o.seconds.(*mockObserver); !ok {
-		t.Errorf(`The type of the option requests property must be of "mockObserver", %T given.`, o.requests)
-	}
-
-	observer := o.seconds.(*mockObserver)
-
-	if len(observer.lvs) != 1 || observer.lvs[0] != "Initial" {
-		t.Errorf(`The given observer lvs must have only one element equal to "Initial", %v given`, observer.lvs)
-	}
-	if observer.value != 1.23 {
-		t.Errorf(`The given observer value must be equal to 1.23, %v given`, observer.value)
-	}
-}
-
-func TestServer(t *testing.T) {
-	e := errors.New("got an error")
-	nextError := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return nil, e
-	}
-	nextValid := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return "Hello valid", nil
-	}
-
-	_, err := Server()(nextError)(context.Background(), "test:")
-	if err != e {
-		t.Error("The given error mismatch the expected.")
-	}
-
-	res, err := Server(func(o *options) {
-		o.requests = &mockCounter{
-			lvs:   []string{"Initial"},
-			value: 1.23,
-		}
-		o.seconds = &mockObserver{
-			lvs:   []string{"Initial"},
-			value: 1.23,
-		}
-	})(nextValid)(transport.NewServerContext(context.Background(), &http.Transport{}), "test:")
-	if err != nil {
-		t.Error("The server must not throw an error.")
-	}
-	if res != "Hello valid" {
-		t.Error(`The server must return a "Hello valid" response.`)
-	}
-}
-
-func TestClient(t *testing.T) {
-	e := errors.New("got an error")
-	nextError := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return nil, e
-	}
-	nextValid := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return "Hello valid", nil
-	}
-
-	_, err := Client()(nextError)(context.Background(), "test:")
-	if err != e {
-		t.Error("The given error mismatch the expected.")
-	}
-
-	res, err := Client(func(o *options) {
-		o.requests = &mockCounter{
-			lvs:   []string{"Initial"},
-			value: 1.23,
-		}
-		o.seconds = &mockObserver{
-			lvs:   []string{"Initial"},
-			value: 1.23,
-		}
-	})(nextValid)(transport.NewClientContext(context.Background(), &http.Transport{}), "test:")
-	if err != nil {
-		t.Error("The server must not throw an error.")
-	}
-	if res != "Hello valid" {
-		t.Error(`The server must return a "Hello valid" response.`)
-	}
-}