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What does nPercentile do in Graphite and how it differs from percentileOfSeries?

I read the docs a million times but I can't figure out what it does. What does nPercentile do in Graphite and how it differs from percentileOfSeries?

Solution

  • nPercentile: "Returns n-percent of each series in the seriesList."

    This converts every series you give it to a single value*, that is the n-th percentile of that series (but it will output as many series as it was given as input).

    *note that as everything in graphite, this single value will be returned as a series, containing many times (as many as needed to fill the requested time-range) the same single value.

    percentileOfSeries: "percentileOfSeries returns a single series which is composed of the n-percentile values taken across a wildcard series at each point."

    This returns a single series, which, for every timepoint, contains the n-th percentile of the different input series.