Design a zero-downtime upgrade of a production cluster from 1.28 to 1.30.

The scenario

You run 3 EKS clusters with around 200 services owned by 25 teams. Leadership wants to get off the unsupported version this quarter with no customer-visible downtime.

Model answer

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Model answer, what to add at your level, the follow-up, and common mistakes.

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The follow-up they'll ask

Common mistakes