docs: def notify(self, instance=None, **kwargs):
          """A wrapper to call notification.notify for each notification
          class associated with the given model instance.
  
          Returns a dictionary of {notification.name: model, ...}
          including only notifications sent.
          """
          notified = {}
          for notification_cls in self.registry.values():
              notification = notification_cls()
              if notification.notify(instance=instance, **kwargs):
                  notified.update({notification_cls.name: instance._meta.label_lower})
          return notified