LWKD: Week Ending July 27, 2025
Week Ending July 27, 2025
Developer News
Due to low attendance and frequent cancellations, SIG Release is seeking a better meeting time via a Doodle poll, open until August 3, 2025 (AOE). This applies only to the main SIG Release meeting, not Release Team meetings. Changes will begin the week of August 18, 2025.
A security vulnerability was found in Kubernetes where an unauthorized user may be able to SSH/RDP/WINRM to Windows VMs built with Kubernetes Image Builder. Clusters using Image Builder version v0.1.44 or earlier are affected, specifically when using Windows images built with Nutanix OVA. Images from other providers are not affected.
Release Schedule
Next Deadline: Docs freeze, August 6
Kubernetes v1.34 has entered Code Freeze as of July 25, 2025. Only release-blocking issues and PRs will be accepted into the v1.34 milestone. Enhancements that didn’t meet the criteria have been removed, but exceptions can be requested if necessary. Key deadlines include August 6 for the docs freeze. For concerns, contact the release team via email or the #sig-release Slack channel. Make sure to get your docs PRs reviewed and merged before the upcoming docs freeze deadline!
Featured PRs
133157: KEP 4033: Add metric for out of support CRI and bump feature to GA
This PR graduates the KubeletCgroupDriverFromCRI feature to GA in v1.34; It finalizes a multi-release effort that allows the kubelet to retrieve the cgroup driver configuration directly from the container runtime using the CRI API; This improves consistency between kubelet and container runtime settings and removes the need for manual configuration alignment; A new metric has been added to report when the runtime does not support the Status.cgroupDriver field in its CRI response, helping identify unsupported or outdated CRI implementations.
133136: feat: Add warnings for unrecognized formats in CRDs
This PR updates how Kubernetes handles custom resource definitions (CRDs) that include format values; When a CRD contains a format value that isn’t recognized, the API server now returns a warning during create or update; The CRD is still accepted, but the warning helps you identify issues such as typos or unsupported values.
This PR adds new test configurations that specifically toggle SchedulerAsyncAPICalls for the _QueueingHintsEnabled scenarios within the Unschedulable test; These tests measure how the scheduler performs when pods cannot be scheduled, and toggling this feature gate helps validate behavior under different configurations.
KEP of the Week
KEP-961: Implement maxUnavailable in StatefulSet
This KEP enhances StatefulSet rolling updates by introducing the maxUnavailable setting, allowing multiple pods to be updated simultaneously instead of the default one-by-one strategy. It aims to speed up rollouts for large applications while respecting minReadySeconds to maintain availability. The StatefulSet controller is improved to better track pod readiness, and metrics like statefulset_unavailability_violation along with event logs help diagnose rollout issues.
Other Merges
- PSA added for blocking
.hoston pod probes - Aggregated API server discovery supports EndpointSlices
- Kubelet monitors device health via DRA and reports it in
pod.status.containerStatuses.allocatedResourcesStatusfield - pkg/kubelet/winstats and pkg/kubelet/volumemanager migrated to contextual logging
- PodLevelResources propagate Pod level hugepage cgroup to containers
- Optional APIs in ResouceSlice.Basic and ResourceClaim.Status.AllocatedDeviceStatus added
- pvc.spec.VolumeAttributesClassName goes from non-nil to nil
- Pod availability checks at the correct time in ReplicaSets
- Scheduler interfaces moved from
pkg/scheduler/frameworkto staging repo - kube-apiserver allows white-spaced CABundle during webhook client creation and validation
- APIVersion fields of the HPA are validated to ensure created API objects function properly
- Allows setting any FQDN as the pod's hostname
- Useful endpoints added for kube-apiserver
- Machine readable output options (JSON & YAML) added to kubectl api-resources
- PodLevelResources updates Downward API defaulting for resource limits
- RV check added on GC delete calls
- Container restart policy rules implemented
- DRA kubelet adds v1 gRPC
- Removed deprecated gogo protocol definitions from
k8s.io/kubelet/pkg/apis/pluginregistrationin favor of protoc - Runtime cost estimation fix for IntOrString custom resource schemas with maximum length
- Kubernetes to return an error if user namespaces are used with volumeDevices
- API calls sent through dispatcher and cache
- Kubelet: metrics for userns pod creations and failures
- Pod rejected when attachment limit is exceeded
- KYAML support added to kubectl
- debug_redact added to cri api secrets
- Metrics added for monitoring async API calls in the scheduler when the SchedulerAsyncAPICalls is enabled
- Fix for handle corner cases in the async preemption
- Bumped DRA API version to "v1" in "deviceattribute" package in
k8s.io/dynamic-resource-allocation - BoundedFrequencyRunner dropped from
pkg/util/async
Promotions
- VolumeAttributesClass to GA
- DRAPrioritizedList to Beta
- DRA API to GA
- PSI metrics to Beta
- kubeletPodResources to Beta
- Windows graceful shutdown to Beta
- DRAAdminAccess to Beta
Version Updates
- Bumped external snapshotter for vgs tests
- Bumped etcd sdk to v3.6.4
- kustomize to v5.7.0
Subprojects and Dependency Updates
- containerd/containerd 1.7.28: The twenty-eighth patch release for containerd 1.7 contains various fixes and updates.
- kustomize kyaml/v0.20.1: drop shlex dependency.
- cluster-api v1.11.0-beta.0: releases beta version for testing
Shoutouts
- Patrick Ohly: Shoutout to @alaypatel07 for tackling the problem of setting up scale tests for DRA. He identified and resolved several bottlenecks, both in the cluster configuration and the Kubernetes source code. He presented at the WG Device Management meeting today and we were happy enough with the preliminary results that graduation to GA is no longer blocked, thanks to @alaypatel07! Also thanks to everyone who has supported him: @jackfrancis, @nojnhuh, @wojtekt and probably others that I don't know about
- Maciej Szulik: Huge shoutout to @Edwin Hernandez and @Heba for their help pushing KEP 961 forward, especially that this is one of the oldest and longest running features
- Benjamin Elder: Thanks to @danwinship for quickly looking into and fixing a conformance test flake in SIG Network
- Benjamin Elder: Thanks @jasonbraganza for tirelessly handling new member requests