-spec datetime(lager_msg()) -> {string(), string()}.

-spec destinations(lager_msg()) -> no_return().

-spec message(lager_msg()) -> list().

-spec metadata(lager_msg()) -> [tuple()].

-spec new(list(), lager:log_level(), [tuple()], list()) -> lager_msg().

-spec new(list(), erlang:timestamp(), lager:log_level(), [tuple()], list()) -> lager_msg().

-spec severity(lager_msg()) -> lager:log_level().

-spec severity_as_int(lager_msg()) -> lager:log_level_number().

-spec timestamp(lager_msg()) -> erlang:timestamp().