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Add documentation for loopback certificates in kube-apiserver #49518

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Description

The loopback certificate is an internal certificate that always exists within the kube-apiserver. Its expiration can cause the kube-apiserver to malfunction. However, there is currently no documentation detailing the risks associated with its expiration or how to troubleshoot related issues.

Issue

Closes: #46407

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@k8s-ci-robot k8s-ci-robot added language/en Issues or PRs related to English language cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. labels Jan 21, 2025
@k8s-ci-robot k8s-ci-robot added the size/S Denotes a PR that changes 10-29 lines, ignoring generated files. label Jan 21, 2025
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/cc @liggitt

@k8s-ci-robot k8s-ci-robot requested a review from liggitt January 21, 2025 11:22
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Add apiserver LoopbackClient server certificate validity period documention
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