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Support gathering "top" percentile statistics
Adds support for collecting statistics on top percentiles, instead of the default bottom percentiles. You specify a top percentile by using a negative number - so -10 will collect the top 10% of data. It will emit: mean_top10, lower_top10, and sum_top10. Using a negative number may seem hacky, but it's convenient and there is a precedent - referencing an array from the end in some languages can be done with negative indexes.
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