API XML some labels with value "-1"?

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


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…

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

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