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Add a NativeHistogramBucketFactor parameter to the use of `NewHistogramVec` in order to enable use of Prometheus Native Histograms. This will store automatically computed sparse buckets in CoreDNS. If a compatible Prometeus requests native histograms this data will returned instead of the static buckets. The default factor of 1.05 should provide high quality resolution data. Signed-off-by: SuperQ <superq@gmail.com>