Werk #8298: Fix invalid total curve in CPU utilization graph

Component	Metrics system
Title	Fix invalid total curve in CPU utilization graph
Date	Aug 17, 2015
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i3 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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