KEP-1965: update apiserver-identity KEP with metrics

[aojea]

• One-line PR description: update apiserver-identity KEP with metrics
• Issue link:

Fixes: kubernetes/kubernetes#105558

[aojea]

/assign @roycaihw @lavalamp

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[roycaihw]

/cc

[roycaihw]

/lgtm

/assign @deads2k
for approval

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@k8s-triage-robot: Closed this PR.

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[JohnRusk]

@aojea , @roycaihw I'm curious as to why this was closed. Has any decision actually been made about whether apiserver-identity will be exposed in metrics?

Even just the basic metric to expose the id:

buildInfo = metrics.NewGaugeVec(
&metrics.GaugeOpts{
Name: "apiserver_identity",
Help: "A metric with a constant '1' value labeled by the kube-apiserver ID",