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The autonomous 1.34.9 version-upgrade chain has been failing its preflight every night. A prior run left k8s-master + k8s-node1 on 1.34.9 while node2-6 stayed on 1.34.8, and preflight's gate-4 runs `kubeadm upgrade plan` on master. On an already-at-target master, kubeadm prints no "kubeadm upgrade apply vX.Y.Z" line, so the parsed target came back empty and the `!= requested` check aborted the whole chain before any worker was touched. Deterministic — it self-cleaned and re-failed identically each night, so it would have failed again tonight, leaving node2-6 stuck on the old patch. Fix: skip the kubeadm-plan-target gate when master is already on TARGET_VERSION — the same at-target self-skip that phase_master and phase_worker already do. The remaining workers are still validated by their own per-node phases, and the detector already confirmed the target is installable via apt-cache. This lets tonight's unattended chain resume and finish node2-6 -> 1.34.9. Runbook updated: node count 5 -> 7, the gate skip note, and a Past Incidents writeup (incl. the collateral apiserver OIDC wipe, restored via the rbac stack). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> |
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