fix

Signed-off-by: Miek Gieben <miek@miek.nl>

plugin/traffic/xds/metrics.go

@@ -8,10 +8,10 @@ import (
 
 var (
 	// ClusterGauge is the number of clusters we are currently tracking.
-	ClusterGauge = prometheus.NewGaugeVec(prometheus.GaugeOpts{
+	ClusterGauge = prometheus.NewGauge(prometheus.GaugeOpts{
 		Namespace: plugin.Namespace,
 		Subsystem: "traffic",
 		Name:      "clusters_tracked",
 		Help:      "Gauge of tracked clusters.",
-	}, []string{""})
+	})
 )