define metrics.Registry as an interface

Author: xrstf

pkg/metrics/registry.go

@@ -18,6 +18,11 @@ package metrics
 
 import "github.com/prometheus/client_golang/prometheus"
 
+type RegistererGatherer interface {
+	prometheus.Registerer
+	prometheus.Gatherer
+}
+
 // Registry is a prometheus registry for storing metrics within the
 // controller-runtime
-var Registry = prometheus.NewRegistry()
+var Registry RegistererGatherer = prometheus.NewRegistry()