docs(runbook): k8s upgrade post-upgrade validation (PGM-193)#29
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Document the two failure modes (stale EndpointSlice IPs, ingress-nginx Lua backend cache) that can silently persist after a rolling microk8s upgrade, with detection commands, recovery options, and a full post-upgrade checklist. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
src/runbooks/k8s-upgrade-validation.mddocumenting the two failure modes that silently persist after a rolling microk8s upgradeingress-validateplay; manual procedure also documentedTest plan
mkdocs serveLinear: PGM-193
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