Kubelet - 1

2026 (4)

October (1)

k8s: The Shift to cgroup v2 in Kubernetes: What You Need to Know

Kubernetes Official Blog

2026-10-06

Kubernetes is deprecating cgroup v1 and is moving toward cgroup v2 as the default path: in v1.35, kubelet startup fails by default on cgroup v1 nodes, and kubeadm preflight checks now error on v1.35+ when v1 is detected. The post also summarizes cgroup v2-related behaviors and features in Kubernetes 1.36, including Memory QoS, container-scoped OOM handling, PSI metrics, and in-place pod-level resource updates.

September (3)

k8s: Kubernetes v1.37: Pod-Level Resource Managers graduated to Beta

Kubernetes Official Blog

2026-09-15

Kubernetes v1.37 graduates Pod-Level Resource Managers to Beta, disabled by default behind the PodLevelResourceManagers feature gate. Kubelet’s Topology Manager, CPU Manager, and Memory Manager can now use pod-level resource declarations for NUMA-aware placement, and the PodResources API reports top-level CPU and memory assignments.

k8s: Kubernetes v1.37: Memory QoS Graduates to Beta

Kubernetes Official Blog

2026-09-14

Kubernetes v1.37 makes Memory QoS Beta and turns it on by default, but it does not change runtime behavior unless you explicitly set throttling or reservation fields. The main config change is that `memoryThrottlingFactor` now defaults to `null`, so existing clusters will not start writing `memory.high` unless they already set it.

k8s: Kubernetes v1.37: Scheduler Preemption for In-Place Pod Resize (Alpha)

Kubernetes Official Blog

2026-09-10

Kubernetes v1.37 adds alpha support for scheduler preemption during in-place Pod resize, gated by InPlacePodVerticalScalingSchedulerPreemption. If a running Pod’s resize is Deferred due to lack of node capacity, the scheduler can now preempt lower-priority Pods on the same node so the resize can complete without restarting the Pod.