Disk temp shows a nonsense total value

In Reporting -> Disk -> Metrics -> Temperature the graphs shows Minimum temperature, Maximum temperature, Average temperature and Total temperature - the Total temperature being e.g. 370 degrees celcius. A Current temperature would be significantly more interesting. Also the Y-axis in some graphs are e.g. 0 to 40 degrees, but 34.9 to 36.1 degrees in others. I would prefer all to start at zero.