[FG:InPlacePodVerticalScaling] Implement version skew handling for in-place pod resize

[vinaykul]

What would you like to be added?

This is a tracking bug to implement two changes to better handle version skew as documented in https://github.com/kubernetes/enhancements/tree/master/keps/sig-node/1287-in-place-update-pod-resources#version-skew-strategy

1. kubelet: When feature-gate is disabled, if kubelet sees a Proposed resize, it rejects the resize as Infeasible.
2. scheduler: If PodStatus.Resize field is not empty, scheduler uses max(ResourcesAllocated, Requests) even if the feature-gate is disabled.

Why is this needed?

This is needed to gracefully handle component version skews that can occur during upgrades.

[k8s-ci-robot]

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[vinaykul]

/sig node
/good-first-issue

[k8s-ci-robot]

@vinaykul:
This request has been marked as suitable for new contributors.

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/sig node
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[infdahai]

/assign

[Sajiyah-Salat]

Hello @infdahai infdahai, are you working on this?

[Sajiyah-Salat]

According to description of pr. The changes are documented but implementation is still remaining, right?

[infdahai]

@Sajiyah-Salat yeah, I just quit this.

[phs-sakshi]

can I work on this issue?

[infdahai]

can I work on this issue?

you can just use /assign command

[carlory]

/assign

[lauchokyip]

@carlory , seem like you have experienced in contributing upstream, do you want to give the chance to others for good-first-issue?

[carlory]

/unassign

[phs-sakshi]

/assign

[itiwarishubham]

/assign

[devilcrises]

/assign

[samyakjain10]

Hey everyone. Just saw this issue assigned to multiple people. Was curious to know if someone is working on it or is it up for grabs?

[phs-sakshi]

/unassign

[Bhanuteja01]

/assign

[Bhanuteja01]

@vinaykul can you explain how to tackle with this issue?

[shubmjagtap]

/assign

[archits581]

/assign

[MeenuyD]

/assign

[wlp1153468871]

/assign

[EtherSol]

/assign

[pbialon]

/assign

[pbialon]

I don't understand the description (sorry for that, I'm a new contributor) (@vinaykul for visibility)

kubelet: When feature-gate is disabled, if kubelet sees a Proposed resize, it rejects the resize as Infeasible.

Is it a desired state description or a current state? If a current state, then what should be a desired behavior here?

[pbialon]

I've fixed (I guess) the first part in kubelet - @vinaykul please take a look when you're free.
If it is not what was expected here, please guide me 🙇

[pbialon]

@vinaykul hi, could you take a look? Or point out somebody who can take it over from you if you're not available?

[Shrihariii]

/assign

[pbialon]

@Shrihariii dunno if it makes sense for you to work on it - there is already an open pull request and discussion in it is going on.

[amomsi]

/assign