Describe purpose and issues with openshift.io/run-level label on namespaces

[markmc]

In e.g. openshift/machine-api-operator#496 we stopped labeling some namespaces with openshift.io/run-level: "1" because those components "should follow normal admission control rules for a cluster".

Some of the background on the purpose of this label and why it should generally be avoided is described in bz #1805488 and should be captured as a doc here.

[markmc]

Some breadcrumbs to the code would be useful too - e.g. the list of admission plugins that are skipped at run-level 1

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[markmc]

From Mark Cooper:

[can we revisit this] as it's very much specific(ish) to OpenShift but not a lot of doco about it, [..] we're interested in getting something together about runlevel usage and what to look out for etc.

[markmc]

Next step would be to ask around for more information (say the API server team) and add some details to openshift/enhancements/CONVENTIONS.md

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[mcoops]

Good to leave closed, PR complete #805 and additionally blog released: https://cloud.redhat.com/blog/exactly-what-are-openshift-runlevels-and-should-you-really-use-them