WIP: [KEP-1748]: Add capacity planning documentation

[dgrisonnet]

kubernetes/enhancements#1748

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[sftim]

/sig instrumentation

I wonder if we could use an observability overview within https://kubernetes.io/docs/concepts/cluster-administration/

[dgrisonnet]

That make total sense 👍 I'll split that up once this one is done.

[dgrisonnet]

I'll move that doc there as well since it is more appropriate I think

[dgrisonnet]

Closing, I'll reopen a new PR targeting the correct branch.