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
if cls._context_managed_dag:
            cls._previous_context_managed_dags.append(cls._context_managed_dag)
        cls._context_managed_dag = dag
    @classmethod
    def pop_context_managed_dag(cls) -> Optional[DAG]:
        old_dag = cls._context_managed_dag
        if cls._previous_context_managed_dags:
            cls._context_managed_dag = cls._previous_context_managed_dags.pop()
        else:
            cls._context_managed_dag = None
        return old_dag
    @classmethod
    def get_current_dag(cls) -> Optional[DAG]:
        return cls._context_managed_dag