Werk #5419: Graphs can now be exported as PNG from the graph context menu

Component	Metrics system
Title	Graphs can now be exported as PNG from the graph context menu
Date	Oct 26, 2017
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Pro, Checkmk Ultimate MT

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