Add: Notification urgent level and list of AllowedLevels

Author: alex-heine

pkg/notifications/model.go

@@ -39,8 +39,16 @@ const (
 	LevelInfo    Level = "info"
 	LevelWarning Level = "warning"
 	LevelError   Level = "error"
+	LevelUrgent  Level = "urgent"
 )
 
+var AllowedLevels = []Level{
+	LevelInfo,
+	LevelWarning,
+	LevelError,
+	LevelUrgent,
+}
+
 // toNotificationModel converts a Notification to the rest model for the notification service.
 // It also adds the current time as timestamp if it is not set.
 func toNotificationModel(n Notification) notificationModel {