Register the Prometheus metrics

server/http.go

@@ -496,3 +496,9 @@ var (
 		Help: "Counter of keystore unlocks.",
 	}, []string{"status", "shard"})
 )
+
+func init() {
+	prometheus.MustRegister(grantsCounter)
+	prometheus.MustRegister(errorsCounter)
+	prometheus.MustRegister(keystoreCounter)
+}

server/login/login.go

@@ -452,3 +452,8 @@ var (
 		Help: "Counter for auth_client errors.",
 	})
 )
+
+func init() {
+	prometheus.MustRegister(loginCounter)
+	prometheus.MustRegister(authclientErrors)
+}