diameter_stats
counter() = any()
ref() = any()
reg(Pid::pid(), Ref::ref()) -> boolean()
reg(Ref::ref()) -> boolean()
incr(Ctr::counter(), Ref::ref(), N::integer()) -> integer() | false
read(Refs::[ref()]) -> [{ref(), [{counter(), integer()}]}]
sum(Refs::[ref()]) -> [{ref(), [{counter(), integer()}]}]
flush(Refs::[ref()]) -> [{ref(), {counter(), integer()}}]
handle_call(Req, From, State) -> term()
handle_cast(Msg, State) -> term()
handle_info(Info, State) -> term()
terminate(Reason, State) -> term()
code_change(OldVsn, State, Extra) -> term()