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Histograms worked

Following up on the use of histograms to generate metric aggregates that can be used to generate charts over much wider time ranges like a week or a month.

Previously we’d been aggregating over raw data points, which worked surprisingly well, but was too slow for generating series for longer time ranges like a week or a month. When rendering metric charts in Dashboard, the service decides which aggregate coarseness to use based on requested interval and resolution: This limitation has been corrected in HdrHistogram implementations for other languages, but the Go port doesn’t see as much development activity, and hasn’t been updated for three years.

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