code: def get_chart_data_hash(tubes)
        chart_data = {}
        chart_data["total_jobs_data"] = Hash.new
        chart_data["buried_jobs_data"] = Hash.new
        chart_data["total_jobs_data"]["items"] = Array.new
        chart_data["buried_jobs_data"]["items"] = Array.new 
        tubes.each do |tube|
          stats = tube.stats
          add_chart_data_to_hash(tube, stats[:total_jobs], chart_data["total_jobs_data"]["items"])
          add_chart_data_to_hash(tube, stats[:current_jobs_buried], chart_data["buried_jobs_data"]["items"])
        end
        chart_data
      end
docs: Return the stats data in a format for the Bluff JS UI Charts