consensus metrics: avoid Histogram in favor of Welford stats
#699
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Problem and Summary of Changes
We aim to capture running first and second order statistics of a number of values in consensus metrics.
consensus_metrics.rsusesHistogram, which:We replace
Histogramwithwelford_stats.rs, which calculates online means and standard deviations within machine precision (i.e., no approximation), paying attention to numerical stability.NOTE: we'll land this PR after #698 gets in.