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This is a two element tuple -- the first is a decimal value which indicates how much of that is in use, and the second is the number of cpus (as measured by linux -- so hyperthreading cores are 2 cpus). For example:
[1.5, 2] - two cores, 150% cpu usage (1 and a half cores are in use)
Note that due to the way jiffies are treated, this plugin imposes a minimum poll granularity of 1 second.