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wire 2026-09-04
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Declarative validation graduates to stable in discovery API

By RepoJournal · Filed · About Kubernetes

Peter Rifel Tim Hockin danwinship krishhna24 hakman Kubernetes Publisher yindia
13 people shipped this
Peter Rifel @rifelpet 4 cited Tim Hockin @thockin 1 cited danwinship @danwinship 1 cited krishhna24 @krishhna24 1 cited hakman @hakman 1 cited Kubernetes Publisher @k8s-publishing-bot 1 cited yindia @yindia 1 cited Jordan Liggitt @liggitt liyuerich @liyuerich kubernetes-prow[bot] @kubernetes-prow[bot] Michael Grosser @grosser willie-yao @willie-yao p0lyn0mial @p0lyn0mial

Kubernetes' discovery API graduates declarative validation to stable, replacing hand-written validation, and kOps adds experimental support for Amazon Linux 2027.

Kubernetes graduated the discovery API's declarative validation rules from beta to stable, per KEP-5073, and removed the handwritten validation they replace [1]. The rules have been at beta since 1.37, and this wave of twelve markers across discovery/v1 became eligible once 1.37 shipped [1]. Also, kops removed the old `NFTablesProxyMode` and `PreferSameTrafficDistribution` feature gates, both of which had gone GA earlier and were overdue for removal [2]. Additionally, admissionregistration now marks `ParamRef.parameterNotFoundAction` as required in the OpenAPI schema [3], and the `validate.UpdateValue` addition marks the last direct call to semantic DeepEqual [4]. In test-infra, a new optional presubmit for Amazon Linux 2027 e2e tests was added, gated behind `/test pull-kops-e2e-k8s-aws-al2027` [8].

kOps added experimental support for Amazon Linux 2027, which entered public preview on 2026-09-03. Detection matches on `ID=amzn` and `VERSION_ID=2027`, ignoring `VARIANT_ID=preview`, so it will keep working when images go GA [5]. The change also includes a refactor adding `Distribution.IsAmazonLinux()` because Amazon Linux is the only distro family with a version-specific project name [6]. The test-infra presubmit was

added because AL2027 is a "large jump from AL2023" with a Fedora 44/45 base, kernel 7.1, systemd 260, glibc 2.44, DNF 5, cgroup v2 only, and SELinux enforcing by default [7]. It is optional and runs only when requested with `/test pull-kops-e2e-k8s-aws-al2027` [8].

In the DigitalOcean CCM update, kOps sets `providerID` on nodes and updates CCM to v0.1.69 [9]. Previously, the CCM was pinned to v0.1.45 because newer versions resolve nodes by `spec.providerID`, and the name-based fallback in v0.1.62 filters server-side, failing to match the private-IP names [9]. Also, a new optional presubmit for lws runs the Helm-based upgrade E2E test, covering the path where Helm never touches the `crds/` directory, so CRDs must be reconciled manually [10].

Action items

References

  1. [1] discovery: graduate declarative validation to stable ↗ kubernetes/kubernetes
  2. [2] clean up PreferSameTrafficDistribution traffic gate ↗ kubernetes/kubernetes
  3. [3] Merge pull request #141527 from grosser/grosser/paramreq ↗ kubernetes/api
  4. [4] Add validate.UpdateValue, deprecate the By* forms ↗ kubernetes/kubernetes
  5. [5] Add experimental support for Amazon Linux 2027 ↗ kubernetes/kops
  6. [6] refactor: add Distribution.IsAmazonLinux() ↗ kubernetes/kops
  7. [7] [kops] Add an optional presubmit for Amazon Linux 2027 ↗ kubernetes/test-infra
  8. [8] [kops] Add an optional presubmit for Amazon Linux 2027 ↗ kubernetes/test-infra
  9. [9] do: set providerID on nodes and update CCM to v0.1.69 ↗ kubernetes/kops
  10. [10] Add lws Helm-based upgrade E2E presubmit ↗ kubernetes/test-infra

$ ls kubernetes/reviews/ # the step-back reads

the week in review Declarative validation for Condition.Message lands, graduates stable the month in review August Ships Kubernetes 1.37 RC and kOps 1.37 Beta
Topics: Go Infrastructure Full archive →

Quick answers

What shipped in Kubernetes on September 4, 2026?
Kubernetes' discovery API graduates declarative validation to stable, replacing hand-written validation, and kOps adds experimental support for Amazon Linux 2027. In total, 52 commits and 25 pull requests landed.
Who contributed to Kubernetes on September 4, 2026?
13 developers shipped this update, including Tim Hockin, Jordan Liggitt, danwinship, liyuerich, krishhna24, Peter Rifel, hakman, and kubernetes-prow[bot], and 5 more.
What were the notable Kubernetes updates?
discovery: graduate declarative validation to stable, clean up PreferSameTrafficDistribution traffic gate, and Merge pull request #141527 from grosser/grosser/paramreq.
♥

$ log @kubernetes --recent

Docs drive the day: Spanish SIG Docs page lands, plus maintenance merges 15 shipped VPA chart 0.12.0 syncs CRDs on upgrade; kOps gains Amazon Linux 2027 coverage 49 shipped kOps drops legacy keyset aliases, mirroring deeper Kubernetes dependency shifts 37 shipped Declarative validation for Condition.Message lands across apimachinery consumers 5 shipped

$ log --all # elsewhere on the wire

Meta React Native adds Stable API guards to renderer attributed string FastAPI & Pydantic Pydantic fixes Mypy plugin crash, tightens datetime constraints

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