rser. A lower
    priority value means the prepper should run sooner than those with higher
    values.

    For the former approach, `Prepper._get_$parser_file_list()` should be used
    and should yield filenames that exist in target archives. For the latter,
    the `Prepper._get_items_for_$map()` should be used.

    Finally, a `regex_items` dict is available for storing individual regex
    items for parsers that rely on them. These items will be added after all
    files and other individual items are handled. This dict has keys set to
    parser/mapping names, and the values should be sets of items, so preppers
    should add to them like so:

        self.regex_items['hostname'].add('myhostname')
    Z	Undefinedéd