vmware : what do red, green, yellow, unknown status indicate?

Document ID : KB000047918
Last Modified Date : 14/02/2018
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These are status indicators passed through the vmware probe coming directly from the ESX host and/or VCenter.

From the VMWare SDK?API:

Enum Description
The current status of the hardware

Enum Constants:
Green: The physical element is functioning as expected
Red: The physical element is failing. It is possible that some or all functionalities of this physical element is degraded or not working.
Unknown: The implementation cannot report on the current status of the physical element
Yellow: All functionality is available but some might be degraded.

Basically, it?s a general health status.? However, there does not appear to be any document that describes what conditions would make a CPU (for example) go from green to yellow, etc.

Further detail would need to come from VMWare support.