diff -up redoctober-3f826eedb692f563514d43f921506324386a98f1/redoctober.go.fix_handler redoctober-3f826eedb692f563514d43f921506324386a98f1/redoctober.go
--- redoctober-3f826eedb692f563514d43f921506324386a98f1/redoctober.go.fix_handler	2018-09-28 23:40:28.000000000 +0200
+++ redoctober-3f826eedb692f563514d43f921506324386a98f1/redoctober.go	2019-06-28 18:24:39.273733857 +0200
@@ -15,7 +15,7 @@ import (
 	"github.com/cloudflare/redoctober/core"
 	"github.com/cloudflare/redoctober/report"
 	"github.com/cloudflare/redoctober/server"
-	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
 
 // initPrometheus starts a goroutine with a Prometheus listener that
@@ -24,7 +24,7 @@ import (
 func initPrometheus() {
 	srv := &http.Server{
 		Addr:    net.JoinHostPort(cfg.Metrics.Host, cfg.Metrics.Port),
-		Handler: prometheus.Handler(),
+		Handler: promhttp.Handler(),
 	}
 
 	log.Printf("metrics.init start: addr=%s", srv.Addr)