http://searchdatacenter.techtarget.com/tip/Remote-server-administration-tools-Manage-your-data-center-from-a-distance

I know HP Proliant servers have atleast 36 sensors onboard for 'event notifications.'

See what the guy in picture is holding - 1/4 way down

http://h20195.www2.hp.com/v2/GetPDF.aspx%2F4AA4-0118ENW.pdf

emit...