Merge pull request #9 from thought-machine/change-metric-label-key

change label key for kubernetes_cluster to avoid confusion

internal/metrics/metrics.go

@@ -16,7 +16,7 @@ var (
 	interruptionEvents = promauto.NewCounterVec(prometheus.CounterOpts{
 		Name: "interruption_events_total",
 		Help: "The total number of spot interruptions for a given cluster",
-	}, []string{"kubernetes_cluster"})
+	}, []string{"target_kubernetes_cluster"})
 )
 
 // Client provides methods for modifying metrics