def METHOD_NAME(self, out_stream=_DEFAULT_OUT_STREAM):
    """
    List of all the different recording sources for which there is recorded data.
    Parameters
    ----------
    out_stream : file-like object
        Where to send human readable output. Default is sys.stdout.
        Set to None to suppress.
    Returns
    -------
    list
        One or more of: `problem`, `driver`, `<system hierarchy location>`,
                        `<solver hierarchy location>`
    """
    pass