Add metrics exporter for prometheus to scrape.

Author: clems4ever

go.mod

@@ -5,16 +5,16 @@ go 1.13
 require (
 	github.com/abbot/go-http-auth v0.4.0
 	github.com/antlr/antlr4 v0.0.0-20200103163232-691acdc23f1f
+	github.com/cespare/reflex v0.3.0 // indirect
 	github.com/cheggaaa/pb v2.0.7+incompatible
 	github.com/deckarep/golang-set v1.7.1
 	github.com/go-sql-driver/mysql v1.5.0
 	github.com/golang-collections/go-datastructures v0.0.0-20150211160725-59788d5eb259
 	github.com/gorilla/mux v1.7.3
-	github.com/mattn/go-colorable v0.0.9 // indirect
-	github.com/mattn/go-isatty v0.0.3 // indirect
+	github.com/prometheus/client_golang v1.8.0
 	github.com/spf13/cobra v0.0.5
 	github.com/spf13/viper v1.6.1
-	github.com/stretchr/testify v1.3.0
+	github.com/stretchr/testify v1.4.0
 	gopkg.in/VividCortex/ewma.v1 v1.1.1 // indirect
 	gopkg.in/cheggaaa/pb.v2 v2.0.7 // indirect
 	gopkg.in/fatih/color.v1 v1.7.0 // indirect