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Your operator is the top API consumer and etcd is sweating. Explain informers, resourceVersion and the real cost of LIST.

Controllers should never poll, yet most home-grown operators do. This question separates people who run controllers at ten-thousand-object scale from those who copied a tutorial: watch semantics, cache behaviour, and which LISTs touch etcd.

Updated Sep 2026 · Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.

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Next in this trackPolicy webhooks enforce our security rules. Should failurePolicy be Ignore or Fail, and what does each cost?Next in this trackA nightly batch job starves the payment service at peak. Design priority and preemption so it cannot recur.Next in this trackWe run three zones and after every incident the recovered zone sits half empty. How do you spread workloads deliberately?

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