Document VPA behavior for sidecar containers and how to change it

[omerap12]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Document VPA behavior for sidecar containers and how to change it

Which issue(s) this PR fixes:

Fixes #7641

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

NONE

[adrianmoisey]

Does "Sidecar" refer to "A container that isn't the main one", or to the formal Sidecar definition (ie: https://kubernetes.io/docs/concepts/workloads/pods/sidecar-containers/)

I assume it's the former. It may be good to clarity this.

[omerap12]

Added in 3e4addd

[adrianmoisey]

Documentation is hard, so thanks for doing this.

I'm wondering how this page fits into the broader layout of the documents. My best guess is that it's a "FAQ" (ie: https://github.com/kubernetes/autoscaler/blob/master/vertical-pod-autoscaler/docs/faq.md).

I'm not entirely sold on that though. Having the document exist is a great first step, we can move it later if needed.

[omerap12]

Documentation is hard, so thanks for doing this.

I'm wondering how this page fits into the broader layout of the documents. My best guess is that it's a "FAQ" (ie: https://github.com/kubernetes/autoscaler/blob/master/vertical-pod-autoscaler/docs/faq.md).

I'm not entirely sold on that though. Having the document exist is a great first step, we can move it later if needed.

I was wondering about that as well. Perhaps @voelzmo might have some ideas on how the overall layout should be structured

[omerap12]

/retest

[voelzmo]

Thanks, great summary. A few suggestions from me.

[voelzmo]

/approve

Thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: omerap12, voelzmo

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• vertical-pod-autoscaler/OWNERS [voelzmo]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[voelzmo]

/lgtm