API XML some labels with value "-1"?

Support & Bugs
1

what the heck is that?
what is the origin of that?


<row>
  <label>-1</label>
  <nb_visits>163</nb_visits>
  <nb_uniq_visitors>165</nb_uniq_visitors>
  <nb_hits>196</nb_hits>
  <sum_time_spent>12222</sum_time_spent>
  <entry_nb_uniq_visitors>37</entry_nb_uniq_visitors>
  <entry_nb_visits>37</entry_nb_visits>
  <entry_nb_actions>209</entry_nb_actions>
  <entry_sum_visit_length>11096</entry_sum_visit_length>
  <entry_bounce_count>22</entry_bounce_count>
  <exit_nb_uniq_visitors>44</exit_nb_uniq_visitors>
  <exit_nb_visits>44</exit_nb_visits>
  <avg_time_on_page>75</avg_time_on_page>
  <bounce_rate>59%</bounce_rate>
  <exit_rate>27%</exit_rate>
</row>

i recognize that Piwik takes that “-1” labels data… in its calculation… in the summarize of folders and data below.
i take only that parts in my calculations, which have a -Tag and value…
so my summarize and the piwik summarize give different values…
and the difference is not small !!
because of that, this question needs an answer…

2

-1 means “Others” and is the aggregated value but you can keep more rows if you want: How to - Analytics Platform - Matomo

3

thanks, now i understand the circumstances,
its a performance feature of piwik, tweakable if needed…