Support PSI based on cgroupv2

[ndixita]

Enhancement Description

• One-line enhancement description (can be used as a release note): Integrating PSI metrics in K8s and using those to set node conditions.
• Kubernetes Enhancement Proposal:
• Discussion Link:
• Primary contact (assignee): @ndixita
• Responsible SIGs: sig-node
• Enhancement target (which target equals to which milestone):
  • Alpha release target (x.y): 1.30
  • Beta release target (x.y):
  • Stable release target (x.y):
• Alpha
  • KEP (k/enhancements) update PR(s):
    • 1.29: KEP-4205: KEP to add PSI metrics in Summary API, and for PSI based node actions #4230
  • Code (k/k) update PR(s):
  • Docs (k/website) update PR(s):

Please keep this description up to date. This will help the Enhancement Team to track the evolution of the enhancement efficiently.

[pacoxu]

/sig node

[SergeyKanzhelev]

/milestone v1.29
/label lead-opted-in
/stage alpha

@ndixita please fill up more details in the issue description. Accepting as we discussed at SIG Node meeting this week

[tzneal]

/cc

[rayandas]

Hello @ndixita 👋, v1.29 Enhancements team here.

Just checking in as we approach enhancements freeze on 01:00 UTC, Friday, 6th October, 2023.

This enhancement is targeting for stage alpha for v1.29 (correct me, if otherwise)

Here's where this enhancement currently stands:

• KEP readme using the latest template has been merged into the k/enhancements repo.
• KEP status is marked as implementable for latest-milestone: 1.29.
• KEP has a production readiness review that has been completed and merged into k/enhancements.

For this KEP, we would just need to update the following:

• The latest readme template has more items in production readiness review questionnaire that need to be addressed.
• The status should be marked as implementable in the kep.yaml file.
• Ensure that the PR including the production readiness review has been reviewed and merged into k/enhancements.

The status of this enhancement is marked as at risk for enhancement freeze. Please keep the issue description up-to-date with appropriate stages as well. Thank you!

[rayandas]

Hi @ndixita 👋🏽 checking in once more as we approach the 1.29 enhancement freeze deadline on 01:00 UTC, Friday, 6th October, 2023. The status of this enhancement is marked as at risk for enhancement freeze.
It looks like PR #4230 will address most of the requirements. Let me know if I missed anything. Thanks.

[ndixita]

The KEP PR is updated, and the comments are resolved. I am waiting for PRR review

[npolshakova]

With KEP PR #4230 approved, the enhancement is ready for the enhancements freeze. The status is now marked as tracked for enhancement freeze for 1.29. 🚀 Thank you!

[katcosgrove]

Hey there @ndixita! 👋, v1.29 Docs Lead here.
Does this enhancement work planned for v1.29 require any new docs or modification to existing docs?
If so, please follows the steps here to open a PR against dev-1.29 branch in the k/website repo. This PR can be just a placeholder at this time and must be created before Thursday, 19 October 2023.
Also, take a look at Documenting for a release to get yourself familiarize with the docs requirement for the release.
Thank you!

[katcosgrove]

Hi again @ndixita! The deadline to open a placeholder PR against k/website for required documentation is this Thursday, 19 October. Could you please update me on the status of docs for this enhancement? Thank you!

[rayandas]

Hey again @ndixita 👋, 1.29 Enhancements team here,

Just checking in as we approach code freeze at 01:00 UTC Wednesday 1st November 2023: .

Here's where this enhancement currently stands:

• All PRs to the Kubernetes repo that are related to your enhancement are linked in the above issue description (for tracking purposes).

• All PR/s are ready to be merged (they have approved and lgtm labels applied) by the code freeze deadline. This includes tests.

Please update the Issue description to include all the related PRs of this KEP under the stable section in the Github Issue description. The status for this KEP is currently at risk for code freeze.

Also, please let me know if there are other PRs in k/k we should be tracking for this KEP.

As always, we are here to help if any questions come up. ✌️ Thanks!

[a-mccarthy]

Hi @ndixita, 👋 from the v1.29 Release Team-Communications! We would like to check if you have any plans to publish a blog for this KEP regarding new features, removals, and deprecations for this release.

If so, you need to open a PR placeholder in the website repository.
The deadline will be on Tuesday 14th November 2023 (after the Docs deadline PR ready for review)

Here is the 1.29 calendar

[ndixita]

@a-mccarthy This feature is postponed to 1.30 release

[npolshakova]

Hello @ndixita 👋 1.29 Enhancements lead here,

Unfortunately, the implementation (code related) PR(s) associated with this enhancement is not in the merge-ready state by code-freeze and hence this enhancement is now removed from the 1.29 milestone.

If you still wish to progress this enhancement in 1.29, please file an exception request. Thanks!

/milestone clear

[amannijhawan]

This would be quite useful to have as we can use the psi metrics as a good proxy for memory pressure and potential for OOMKILL.

Thanks
Aman