Merge pull request #20 from utilitywarehouse/metrics

Add queue metrics

Author: ribbybibby

go.mod

@@ -10,6 +10,7 @@ require (
 	github.com/hashicorp/golang-lru v0.5.4 // indirect
 	github.com/imdario/mergo v0.3.11 // indirect
 	github.com/mattn/go-colorable v0.1.8 // indirect
+	github.com/prometheus/client_golang v1.10.0
 	github.com/stretchr/testify v1.6.1
 	golang.org/x/oauth2 v0.0.0-20200902213428-5d25da1a8d43 // indirect
 	google.golang.org/appengine v1.6.7 // indirect