Add time-windowed tdigest implementation#9940
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What changed?
Added a time-windowed tdigest implementation to allow for local collection of health-related statistics. These will be used to report on system health via the DeepHealthCheck endpoints on the history and frontend services.
Why?
The existing moving averages are not sufficient to track cluster health accurately. T-digest allows for the collection and measurement of trimmed-mean and quantile measures.
How did you test it?