KEP-3453 minimize iptables-restore to Beta

[danwinship]

• One-line PR description: move KEP to ~beta~ ~GA~ beta

• Issue link: #3453

• Other comments:

~(For the moment this PR just exists to continue the conversation from #3454.)~

/cc @wojtek-t

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/lifecycle stale

[wojtek-t]

Sorry - I dropped it. Will get back to it this week.

/remove-lifecycle stale

[danwinship]

@wojtek-t We did a KEP review pass in the SIG Network meeting today, and @thockin was in favor of skipping Beta for this and just going straight to GA (perhaps "GA but with the feature gate still flippable, just in case").

Reiterating some discussion from the earlier PR: there was not any particular reason to think we were going to run into bugs with this code, and the examples in the KEP were just me brainstorming theoretical failure modes. Rather, the point of the KEP/feature gate was just that the possible badness was tiny_chance_of_bugs * huge_number_of_people_affected. But since testing in the perf e2e tests has not turned up bugs, we feel more confident about just inflicting it on everyone now.

[wojtek-t]

@danwinship - I still think that the metric that we were discussing would actually be useful, but I don't want trigger the pain, if I'm the only person who sees that metric as useful (and I looked into the code and agree that adding this metric wouldn't be super trivial task).

So for now, may I ask you to add two-three sentences about that into: https://github.com/kubernetes/enhancements/pull/3454/files#diff-6efffdb08cfb3aefcb1047676bfdecec745cf9ad84879e07a34f151fc97dd96aR400 [Are there any missing metrics that would be useful to have to improve observability of this feature? section of the PRR] so leave the clear trace that we spend time discussing that just decided not doing this?

[danwinship]

updated... I can't get "make verify" to run locally so let's see if it complains about me trying to skip beta...

/assign @thockin

[wojtek-t]

/approve PRR

Thanks!

[aojea]

/lgtm /approve

beta sounds good, I have to update some scalability jobs anyway 😄

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aojea, danwinship, thockin, wojtek-t

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Needs approval from an approver in each of these files:

• ~~keps/prod-readiness/OWNERS~~ [wojtek-t]
• ~~keps/sig-network/OWNERS~~ [thockin]

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