anchor.diff:  %% create_node_stats_rrd/1
   %% ====================================================================
   %% @doc Creates node stats Round Robin Database
  -  -spec create_node_stats_rrd(Pid :: pid()) -> Result when
  -Result :: {ok, Data :: binary()} | {error, Error :: term()}.
  +-spec create_node_stats_rrd(Pid :: pid()) -> Result when
  +  Result :: {ok, Data :: binary()} | {error, Error :: term()}.
   %% ====================================================================
   create_node_stats_rrd(Pid) ->
     {ok, Period} = application:get_env(?APP_Name, node_monitoring_period),
  
positive.code:   case file:open(Path ++ "/load_log.csv", [write]) of
      {ok, Fd} ->
        NodeStats = get_node_stats(0),
        Header = string:join(["elapsed", "window" | lists:map(fun({Name, _}) -> atom_to_list(Name) end, NodeStats)], ", ") ++ "\n",
        io:fwrite(Fd, Header, []),
        erlang:send_after(Interval * 1000, self(), {timer, {log_load, StartTime, StartTime}}),
        {noreply, State#node_state{load_logging_fd = Fd}};
  
negative.code:       end, Values),
  
        lists:zip(HeaderAtom, AvgValues);
      Other ->
        lager:error("RRDERLANG FETCH: ~p~n", [Other]),
        Other
    end.
  
  %% save_node_stats_to_rrd/0
  