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: https://github.com/kubernetes/enhancements/blob/master/keps/sig-node/4205-psi-metric/README.md

• Discussion Link:

• Primary contact (assignee): @ndixita

• Responsible SIGs: sig-node

• Enhancement target (which target equals to which milestone):

  • Alpha release target (x.y): 1.33
  • 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
    • 1.30: KEP-4025: several formatting fixes #4360
    • 1.30: KEP-4205: updating the milestone for alpha to 1.30 #4454
    • 1.32: 4205: retarget to 1.32 #4883
    • 1.33: 4205: bump to 1.33 #5111 KEP-4205: Update PSI KEP for 1.33 #5155
  • Code (k/k) update PR(s):
    • 1.32 vendor: bump runc/libcontainer to v1.2.1 kubernetes#128276
    • Runc 1.2.0 libct/cg/stats: support PSI for cgroup v2 opencontainers/runc#3900
    • Containerd 2.0 only(not included in v1.7 containerd) support psi containerd/cgroups#308
    • Cadvisor: Add Pressure Stall Information Metrics google/cadvisor#3649
    • Surface Pressure Stall Information (PSI) metrics kubernetes#130701
  • Docs (k/website) update PR(s): KEP 4205: draft PR for PSI KEP website#48468
    • KEP-4205: update for alpha release in 1.33 website#49895

• Beta

  • KEP (k/enhancements) update PR(s):
    • KEP-4205: Split the two phases into two KEPs and update Alpha and Beta requirements #5409
    • KEP-4205: add blurb about PSI performance on top of https://github.com/kubernetes/enhancements/pull/5409 #5427
  • Code (k/k) update PR(s):
  • Docs (k/website) update(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.