KEP-5307 Initial KEP for container restart policy

[yuanwang04]

• One-line PR description: Initial KEP for container restart policy

• Issue link: Container restart rules to customize the pod restart policy #5307

• Other comments: Discussion link https://docs.google.com/document/d/13fQu343OBEM2ICHLXfWHrApmzskd4nY3xWI27EbMJyI/edit?tab=t.0

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[SergeyKanzhelev]

@dchen1107 I remember you had a concern with having Never pod with the container inside it that has restart count increasing. How strong is this concern? Strong enough to iontroduce the restartPolicy: Custom?

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[kannon92]

/ok-to-test

[mimowo]

I would suggest to propose the full API, similarly as here, and provide this yaml as an example.

[yuanwang04]

Thanks, I added the full API, please take a look at let me know if you have any questions or concerns, cc @SergeyKanzhelev

[mimowo]

@yuanwang04 thank you for the work, I like this proposal, AFAIK this approach is fully compatible with the Job's podFailurePolicy (at least if I'm not missing something), because when Pod's restartPolicy: Never, then Job's podFailurePolicy only analyzes pods which reach the "Failed" phase. Here, the pods avoid reaching the failed phase. Once they reach, they will be matched against podFailurePolicy which may decide to recreate the entire pod.