Add prometheus metrics

api/handler.go

@@ -8,6 +8,7 @@ import (
 	"strconv"
 
 	"github.com/dstotijn/ct-diag-server/diag"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
 
 type handler struct {
@@ -19,9 +20,9 @@ func NewHandler(repo diag.Repository) http.Handler {
 	h := handler{diagSvc: diag.NewService(repo)}
 
 	mux := http.NewServeMux()
-
 	mux.HandleFunc("/diagnosis-keys", h.diagnosisKeys)
 	mux.HandleFunc("/health", h.health)
+	mux.Handle("/metrics", promhttp.Handler())
 
 	return mux
 }

go.mod

@@ -2,4 +2,7 @@ module github.com/dstotijn/ct-diag-server
 
 go 1.14
 
-require github.com/lib/pq v1.3.0
+require (
+	github.com/lib/pq v1.3.0
+	github.com/prometheus/client_golang v1.5.1
+)

go.sum

@@ -1,2 +1,88 @@
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