code: def remove_in_progress_notification(self, notification):
          
          if notification.uuid in self.notifications_in_progress:
              notification.status = ACT_STATUS_ZOMBIE
              del self.notifications_in_progress[notification.uuid]
docs: Remove a notification and mark them as zombie
  
          :param notification: the notification to remove
          :type notification: alignak.notification.Notification
          :return: None