collect metrics stability is beta

[flavono123]

Description

How can the docs be improved?

instructions for collecting or showing 'beta' metrics has to be documented

in metrics doc there are stability levels for each metric but no instruction to show them:
https://karpenter.sh/docs/reference/metrics/

cannot sure some of them collected right (even for the level is stable are) since i cannot find them in a response of /metrics endpoint.

there should be instructions checking all metric in the doc is collected well and enabling for each stability if possible.

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