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content/en/metrics/nested_queries.md

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 ## Percentiles
 
 Percentile calculations provide deeper insights into data distribution, setting performance thresholds, and identifying outliers/extremes in your data. For metrics where globally accurate percentile aggregations are essential, submitting [distribution metrics][4] achieves this directly without applying nested queries. 
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 ## Standard Deviation
 
 Standard deviation helps measure the variability or dispersion of a dataset. The following query calculates the standard deviation of the sum of API request counts, averaged over 5-minute intervals, and rolled up over 1-hour periods: