# File lib/cabin/metrics/histogram.rb, line 10
  def initialize
    @lock = Mutex.new
    @inspectables = [ :@total, :@min, :@max, :@count, :@mean ]

    # Histogram should track many things, including:
    # - percentiles (50, 75, 90, 95, 99?)
    # - median
    # - max
    # - min
    # - total sum
    #
    # Sliding values of all of these?
    @total = 0
    @min = nil
    @max = nil
    @count = 0
    @mean = 0.0
  end