add prometheus exporter

go.mod

@@ -5,24 +5,34 @@ go 1.18
 require (
 	github.com/gofrs/uuid v4.2.0+incompatible
 	github.com/hypebeast/go-osc v0.0.0-20220308234300-cec5a8a1e5f5
+	github.com/labstack/echo-contrib v0.13.0
 	github.com/labstack/echo/v4 v4.7.2
 	github.com/labstack/gommon v0.3.1
-	golang.org/x/net v0.0.0-20220425223048-2871e0cb64e4
+	golang.org/x/net v0.0.0-20220728030405-41545e8bf201
 	gopkg.in/yaml.v2 v2.4.0
 )
 
 require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.1.2 // indirect
 	github.com/golang-jwt/jwt v3.2.2+incompatible // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
 	github.com/kr/pretty v0.3.0 // indirect
 	github.com/mattn/go-colorable v0.1.12 // indirect
 	github.com/mattn/go-isatty v0.0.14 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/prometheus/client_golang v1.12.2 // indirect
+	github.com/prometheus/client_model v0.2.0 // indirect
+	github.com/prometheus/common v0.37.0 // indirect
+	github.com/prometheus/procfs v0.8.0 // indirect
 	github.com/rogpeppe/go-internal v1.8.0 // indirect
 	github.com/stretchr/testify v1.7.1 // indirect
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
 	github.com/valyala/fasttemplate v1.2.1 // indirect
-	golang.org/x/crypto v0.0.0-20220427172511-eb4f295cb31f // indirect
-	golang.org/x/sys v0.0.0-20220503163025-988cb79eb6c6 // indirect
+	golang.org/x/crypto v0.0.0-20220722155217-630584e8d5aa // indirect
+	golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10 // indirect
 	golang.org/x/text v0.3.7 // indirect
-	golang.org/x/time v0.0.0-20220411224347-583f2d630306 // indirect
+	golang.org/x/time v0.0.0-20220722155302-e5dcc9cfc0b9 // indirect
+	google.golang.org/protobuf v1.28.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
 )