Werk #4477: Now graph time ranges are configurable

Component	Metrics system
Title	Now graph time ranges are configurable
Date	Feb 28, 2017
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Pro, Checkmk Ultimate MT 1.4.0b4 Checkmk Pro, Checkmk Ultimate MT

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