I couldn't find any official documentation specifying what each parameter to a `sla_miss_callback` callable are. This would be a great addition to know how to properly format the messages sent.
airflow/models/dag.py
DeprecationWarning,
                stacklevel=2,
            )
            max_active_tasks = concurrency
        self._max_active_tasks = max_active_tasks
        self._pickle_id: Optional[int] = None
        self._description = description
        
        back = sys._getframe().f_back
        self.fileloc = back.f_code.co_filename if back else ""
        self.task_dict: Dict[str, BaseOperator] = {}
        
        if start_date and start_date.tzinfo:
            self.timezone = start_date.tzinfo
        elif 'start_date' in self.default_args and self.default_args['start_date']:
            if isinstance(self.default_args['start_date'], str):
                self.default_args['start_date'] = timezone.parse(self.default_args['start_date'])
            self.timezone = self.default_args['start_date'].tzinfo
        if not hasattr(self, 'timezone') or not self.timezone:
            self.timezone = settings.TIMEZONE
        
        if 'end_date' in self.default_args and self.default_args['end_date']:
            if isinstance(self.default_args['end_date'], str):
                self.default_args['end_date'] = timezone.parse(
                    self.default_args['end_date'], timezone=self.timezone
                )
        self.start_date = timezone.convert_to_utc(start_date)
        self.end_date = timezone.convert_to_utc(end_date)
        
        if 'start_date' in self.default_args: