New to Ganglia. I am trying to understand the Ganglia metrics output.  e.g. 
...<METRIC NAME="cpu_nice" VAL="0.0" TYPE="float" UNITS="%" TN="176336"
TMAX="90" DMAX="0" SLOPE="both" SOURCE="gmond"/>

Not clear what does the following means
a) TN
b) TMAX
c) DMAX
 
Is there a document explaining each of these terms?
 
Thanks
-Vinay

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