updated swap KEP: targeting alpha2 in 1.26

[SergeyKanzhelev]

Updated SWAP KEP to indicate that in 1.26 we will be working on the feature but are not ready to promote it to beta. The reason for this is that there are still many uncertainty with what guarantees we can provide and whether the feature can destabilize the system.

One possible outcome of alpha2 work is that we may decide to limit the feature to cgroupv2.

Before this is investigated, it's better to keep feature in alpha stage.

• Issue link: Node memory swap support #2400

/sig node
/assign @dchen1107 @derekwaynecarr

[dchen1107]

Can you clarify a little bit on "Verify" here? Manual testing and figure out the work items for beta? Document the changes to guide the users for the alpha feature?

[dchen1107]

/lgtm
/approve

When you mentioned to have the feature staying at alpha, but move it to alpha2, I didn't understand the reasons. Now I see. There are some unknowns in previous alpha stage (management overhead reservation, security, etc.), while more new changes around the feature (cgroup v2, etc.). Thanks for making sure the feature can be used easier as alpha.

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[dchen1107]

cc/ @mrunalp for vis.