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When a nested Kind cluster fails in the Kubernetes-provider trial, the retained evidence showed that the nested kubelet failed but not why. Add a closed classifier for the nested kubelet journal: it keeps the newest bounded bytes and drops a line cut part-way, matches each signal only when all its phrases are on the same line, emits only labels from one allow-list, and reports empty input as unavailable. The trial prints it for the control-plane and worker nodes of a failed Vanilla cluster. A test checks every output line against the allow-list and that no journal text is published. Part of #8186 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Why
When a nested Kind cluster fails to start in the Kubernetes-provider trial, the saved evidence shows that the nested kubelet failed but not why. An earlier attempt kept giving misleading labels, because it searched the whole journal for loose phrases.
What
Failed trials now print a short summary of the nested kubelet journal, using only labels from a fixed list. A label is given only when all of its phrases appear on the same journal line, and no journal text is ever published.
Fixes #8186
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