Werk #14534: Add unit conversion support for graphs

Component	Metrics system
Title	Add unit conversion support for graphs
Date	Sep 21, 2022
Level	Prominent Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.2.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.2.0b1 Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

Note: This werk is deprecated in favor of werk 15660. As of werk 15660, unit conversions are no longer configurable via graph tunings. Any already exisiting settings will be ignored (all configurable conversions were anyway conversions between temperature units).

This werk adds the support for converting the displayed unit of a metric in a graph.

Currently we only support conversion of degrees from Celsius to Fahrenheit or Kelvin but this can be extended in the future.

To convert a unit you can use the Convert unit to option in Graph Tunings.

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