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
"""
    Python dag decorator. Wraps a function into an Airflow DAG.
    Accepts kwargs for operator kwarg. Can be used to parametrize DAGs.
    :param dag_args: Arguments for DAG object
    :type dag_args: Any
    :param dag_kwargs: Kwargs for DAG object.
    :type dag_kwargs: Any
    """
    def wrapper(f: Callable):
        
        dag_sig = signature(DAG.__init__)
        dag_bound_args = dag_sig.bind_partial(*dag_args, **dag_kwargs)
        @functools.wraps(f)
        def factory(*args, **kwargs):
            
            
            
            f_sig = signature(f).bind(*args, **kwargs)