Training: Add documentation for the MultiKueue and spec.managedBy API

[Garvit-77]

This Documentation resolves : kubeflow/training-operator/issues/2279

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[Garvit-77]

@andreyvelich please review the PR and let me know if any changes are expected

[mimowo]

Please help us with the review ack

[mimowo]

FYI, I think the feature will be almost completely a technical detail hidden from the users, as we are going to default the field in MultiKueue by a webhook once https://github.com/kubernetes-sigs/kueue/issues/2552 is done. So, I think describing the field is ok, but eventually a "plain" TFJob is what the user yaml contains. So, I think we will be able to reference to the MultiKueue docs for example.

[mimowo]

FYI we already have a note about this in Kueue in the MD file: https://github.com/kubernetes-sigs/kueue/blob/main/site/content/en/docs/tasks/run/multikueue/kubeflow.md. The actual user-facing documentation in https://kueue.sigs.k8s.io/docs/ link will be available when we release 0.11, which is planned for March 17th.

[andreyvelich]

he location of the field is changed between training-operator 1.9.0 and the new trainer. Trainer is still not supported though. Is this documentation page meant for 1.9.0 or the new trainer, or both? If both, should we add a note that the snippet presents the yaml only for training-operator 1.9.0?

These docs should be placed under legacy guide for Kubeflow Training Operator 1.9 https://www.kubeflow.org/docs/components/trainer/legacy-v1/user-guides/

@Garvit-77 Please can you rebase this PR, so you have the correct location for the guide.

[Garvit-77]

Hey @andreyvelich just rebased this on github itself and made changes had some issues with gpg while rebase I hope it still marks the requirement

[google-oss-prow[bot]]

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