The standard deviation shows how much variation there is from the average (mean, or expected value). A low standard deviation indicates that the data points tend to be very close to the mean. High standard deviation indicates that the data points are spread out over a large range of values.
The standard deviation is calculated for rollups and for event and reporting purposes.
A rollup is the process during which metric values are aggregated. In an hourly rollup, the 1 minute, 5 minute, 15 minute, 30 minute, and 60 minute polled values for metrics are aggregated every hour. In a daily rollup, hourly values for metrics are aggregated once a day. In a weekly rollup, daily values for metrics are aggregated once a week.
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