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docs/MetricsQL.md: document that histogram_share() accepts optional boundsLabel arg

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Aliaksandr Valialkin 2022-11-24 17:27:30 -08:00
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@ -1052,6 +1052,8 @@ See also [histogram_quantile](#histogram_quantile).
`histogram_share(le, buckets)` is a [transform function](#transform-functions), which calculates the share (in the range `[0...1]`)
for `buckets` that fall below `le`. This function is useful for calculating SLI and SLO. This is inverse to [histogram_quantile](#histogram_quantile).
The function accepts optional third arg - `boundsLabel`. In this case it returns `lower` and `upper` bounds for the estimated share with the given `boundsLabel` label.
#### histogram_stddev
`histogram_stddev(buckets)` is a [transform function](#transform-functions), which calculates standard deviation for the given `buckets`.