feat(summary): add standard deviation in derived metrics #3797
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What?
Adds standard deviation calculation to the Percentiles struct in the summary package, providing
variability metrics alongside existing percentile data.
Why?
Standard deviation helps quantify the variability/spread of container resource usage (CPU, memory).
This enables in better anomaly detection (high std indicates unstable resource usage)
How?
getStandardDeviation()using sample standard deviation formula with Bessel's correction(n-1 divisor)