anchor.diff:          false ->
               dqe_idx:add(?BUCKET, Metric,
                           ?BUCKET, Key,
  -                        undefined, [{<<>>, <<"host">>, Host} | Tags]),
  +                        undefined, [{<<"ddb">>, <<"host">>, Host} | Tags]),
               sets:add_element(SetKey, Seen);
           true ->
               Seen
  
positive.code:     Metric = metric_name(Name),
      SeenAcc1 = maybe_idx(Prefix, Metric, [Prefix | Metric],
                           [
                            {<<>>, <<"type">>, <<"count">>}
                           ],
                           SeenAcc),
      DictAcc1 = add_metric(Prefix, Metric,
  
negative.code:     P1 = [Prefix, <<"handoffs">>, <<"inbound">>],
      P2 = [Prefix, <<"handoffs">>, <<"outbound">>],
      Seen1 = maybe_idx(Prefix, [<<"handoffs">>], P1,
                        [{<<"ddb">>, <<"direction">>, <<"inbound">>}],
                       Seen),
      Dict1 = add_to_dict(P1, Time, length(Inbound), Dict),
      Seen2 = maybe_idx(Prefix, [<<"handoffs">>], P2,
                        [{<<"ddb">>, <<"direction">>, <<"outbound">>}],
                       Seen1),
      Dict2 = add_to_dict(P2, Time, length(Outbound), Dict1),
      {Seen2, Dict2}.
  