anchor.diff:  metric_names(Nodes) ->
       [
          [{metric_name(T, N), gauge} || N <- Nodes]
  -       || T <- ["la1", "cpu", "ram", "nettx", "netrx"]
  +       || T <- ["la1", "cpu", "ram", "nettx", "netrx", "interval"]
       ].
   
   %% gen_server callbacks
  
positive.code:     {noreply, State}.
  
  handle_info(trigger,
      #state{last_rx_bytes = LastRXBytes, last_tx_bytes = LastTXBytes} = State) ->
  
      case cpu_sup:avg1() of
          {error, LAFailedReason} ->
  
negative.code: init([]) ->
      lager:info("~p started on node ~p", [?MODULE, node()]),
      erlang:send_after(interval(), self(), trigger),
      {ok, #state{last_rx_bytes = not_available,
          last_tx_bytes = not_available,
          last_trigger_timestamp = not_available}}.
  
  handle_call(_Request, _From, State) ->
      Reply = ok,
  