74 lines
1.7 KiB
Ruby
74 lines
1.7 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module CycleAnalytics
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class UsageData
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PROJECTS_LIMIT = 10
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attr_reader :projects, :options
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def initialize
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@projects = Project.sorted_by_activity.limit(PROJECTS_LIMIT)
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@options = { from: 7.days.ago }
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end
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def to_json
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total = 0
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values =
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medians_per_stage.each_with_object({}) do |(stage_name, medians), hsh|
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calculations = stage_values(medians)
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total += calculations.values.compact.sum
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hsh[stage_name] = calculations
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end
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values[:total] = total
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{ avg_cycle_analytics: values }
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end
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private
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def medians_per_stage
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projects.each_with_object({}) do |project, hsh|
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::CycleAnalytics::ProjectLevel.new(project, options: options).all_medians_by_stage.each do |stage_name, median|
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hsh[stage_name] ||= []
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hsh[stage_name] << median
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end
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end
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end
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def stage_values(medians)
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medians = medians.map(&:presence).compact
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average = calc_average(medians)
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{
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average: average,
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sd: standard_deviation(medians, average),
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missing: projects.length - medians.length
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}
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end
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def calc_average(values)
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return if values.empty?
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(values.sum / values.length).to_i
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end
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def standard_deviation(values, average)
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Math.sqrt(sample_variance(values, average)).to_i
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end
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def sample_variance(values, average)
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return 0 if values.length <= 1
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sum = values.inject(0) do |acc, val|
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acc + (val - average)**2
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end
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sum / (values.length - 1)
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end
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end
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end
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end
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