[networking] Kubelet CSR Stuck at Approved When the Signing Controller Is Not Issuing

[jing2uo]

新增一篇 ACP KB 文章。

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 532b1a1f-aaec-4e65-bf97-b26fa2b9d427

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Reviewing files that changed from the base of the PR and between 55a33b3 and 4670809.

📒 Files selected for processing (1)

• docs/en/solutions/Kubelet_CSR_Stuck_at_Approved_When_the_Signing_Controller_Is_Not_Issuing.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch kb/2026-04-21/expired-node-certificates-cause-csr-back

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