fix: set the kube_cluster_name tag via event summary if it exists

internal/notifier/datadog.go

@@ -142,12 +142,20 @@ func (d *DataDog) toDataDogTags(event *eventv1.Event) []string {
 		// "env" is a standard tag for datadog and usually matches the cluster name: https://docs.datadoghq.com/getting_started/tagging/unified_service_tagging/?tab=kubernetes
 		fmt.Sprintf("env:%s", d.env),
 		// Note: DataDog standardizes kubernetes tags as "kube_*": https://github.com/DataDog/datadog-agent/blob/82dc933aa86de037c70fe960384aa06a62e457a8/pkg/collector/corechecks/cluster/kubernetesapiserver/events_common.go#L48
-		fmt.Sprintf("kube_cluster_name:%s", d.env),
 		fmt.Sprintf("kube_kind:%s", event.InvolvedObject.Kind),
 		fmt.Sprintf("kube_name:%s", event.InvolvedObject.Name),
 		fmt.Sprintf("kube_namespace:%s", event.InvolvedObject.Namespace),
 	}
 
+	// set the cluster name to the value of the summary field if it exists
+	// otherwise, set it to the value of the channel
+	if v, ok := event.Metadata["summary"]; ok {
+		tags = append(tags, fmt.Sprintf("kube_cluster_name:%s", v))
+		delete(event.Metadata, "summary")
+	} else {
+		tags = append(tags, fmt.Sprintf("kube_cluster_name:%s", d.env))
+	}
+
 	// add extra tags from event metadata
 	for k, v := range event.Metadata {
 		tags = append(tags, fmt.Sprintf("%s:%s", k, v))