Filter event metadata based on the object group

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

internal/server/event_handlers.go

@@ -332,16 +332,29 @@ func redactTokenFromError(err error, token string) error {
 // TODO: move the metadata filtering function to fluxcd/pkg/runtime/events
 // cleanupMetadata removes metadata entries which are not used for alerting
 func cleanupMetadata(event *events.Event) {
-	excludeList := []string{"checksum"}
-
+	group := event.InvolvedObject.GetObjectKind().GroupVersionKind().Group
+	meta := make(map[string]string)
+	excludeList := []string{fmt.Sprintf("%s/checksum", group)}
 	if event.Metadata != nil && len(event.Metadata) > 0 {
-		for key := range event.Metadata {
+		for key, val := range event.Metadata {
 			for _, k := range excludeList {
 				if strings.ToLower(k) == strings.ToLower(key) {
 					delete(event.Metadata, key)
 					break
 				}
 			}
+			// filter meta based on group prefix
+			if strings.HasPrefix(key, group) {
+				newKey := strings.TrimPrefix(key, fmt.Sprintf("%s/", group))
+				meta[newKey] = val
+			}
+			// for backwards compatibility include the revision without a group prefix
+			revisionKey := "revision"
+			if key == revisionKey {
+				meta[revisionKey] = val
+			}
 		}
 	}
+
+	event.Metadata = meta
 }