A number of NTP histograms are split by tile source: TopSites ("client"), PopularSites ("popular"), MostLikely ("server0" or "server8"). The MostLikely ones are further split by "provider ID", which in practice is always 0 on desktop and always 8 on mobile. It's also not always included.
We should remove the provider ID from all histograms, and just use "server".
Comment 1 by treib@chromium.org
, Jul 1 2016Status: Assigned (was: Available)