docs: def get_trend(timeseries):
      """
      Using the values returned by get_timeseries(), compare the current
      Metric value with it's previous period's value
  
      :param timeseries: data returned from the get_timeseries() method
      :returns: the last period value and relative change
      """
  
      last = timeseries['value'][len(timeseries['value']) - 1]
      prev = timeseries['value'][len(timeseries['value']) - 2]
      trend = last - prev
      trend_percentage = None
  
      if last == 0:
          if prev > 0:
              trend_percentage = -100
          else:
              trend_percentage = 0
      else:
          trend_percentage = int((trend / last) * 100)
      return (last, trend_percentage)