Commits on Jul 14, 2022

1. Flatten the buckets of native histograms …

   This is slightly more efficient on the wire, and it matches the way
   the corresponding Go types are structured (`histogram.Histogram` and
   `histogram.FloatHistogram`). This follow the change for the
   remote-write protobuf in
   prometheus/prometheus#11011 .
   
   This commit also moves away from the "sparse histogram" naming in lieu
   of the preferred name "native histogram".
   
   Note that this is deliberately an incompatible change of the proto
   spec. Keeping compatibility would cause some hassle but not much gain
   because we haven't published the proto spec in any release yet and
   always marked it as experimental. Compatibility to the released proto
   spec (without native histograms) is kept, of course.
   
   Signed-off-by: beorn7 <beorn@grafana.com>

   

   beorn7 committed Jul 14, 2022
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