What do these colors indicate in these graphs? This one is for Disk Reads which is one of those components making up the template.
I assume BLUE is Warning and Light-Green is Critical, but I wanted to ask to be sure.

and as for the Disk Reads per Sec and Disk Writes per Sec these are both pre-defined in the template as Warning 4,042,880 and Critical is 5,242,880.
Where did these values come from and has anyone seen these as being much too low? Thanks.