Werk #8376: Fixed graph rendering for perfdata values using a dot in their key

Component	Metrics system
Title	Fixed graph rendering for perfdata values using a dot in their key
Date	Jan 21, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i4 Checkmk Pro, Checkmk Ultimate MT

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