- The kubelet and the default docker runtime now support running ephemeral containers in the Linux process namespace of a target container. Other container runtimes must implement support for this feature before it will be available for that runtime. ([#84731](https://github.com/kubernetes/kubernetes/pull/84731), [@verb](https://github.com/verb)) [SIG Node]

A security issue was discovered in Kubernetes where users may be able to launch containers that bypass the mountable secrets policy enforced by the ServiceAccount admission plugin when using containers, init containers, and ephemeral containers with the envFrom field populated.

**Affected Versions**:
  - kube-apiserver v1.29.0 - v1.29.3
  - kube-apiserver v1.28.0 - v1.28.8

- Now users can get object info like:

  ```bash
    a. kubectl get pod test-pod -o custom-columns=CONTAINER:.spec.containers[0:3].name
    b. kubectl get pod test-pod -o custom-columns=CONTAINER:.spec.containers[-2:].name
  ```

([#73063](https://github.com/kubernetes/kubernetes/pull/73063), [@WanLinghao](https://github.com/WanLinghao))

    - [API changes and improvements for ephemeral containers](#api-changes-and-improvements-for-ephemeral-containers)
  - [Known Issues](#known-issues)
    - [CPU and Memory manager are not working correctly for Guaranteed Pods with multiple containers](#cpu-and-memory-manager-are-not-working-correctly-for-guaranteed-pods-with-multiple-containers)

- github.com/containerd/containerd/api: [v1.7.19](https://github.com/containerd/containerd/tree/api/v1.7.19)
- github.com/containerd/errdefs: [v0.1.0](https://github.com/containerd/errdefs/tree/v0.1.0)
- github.com/containerd/log: [v0.1.0](https://github.com/containerd/log/tree/v0.1.0)
- github.com/containerd/typeurl/v2: [v2.2.0](https://github.com/containerd/typeurl/tree/v2.2.0)

* Upgrade cAdvisor library to v0.25.0. Notable changes include,
  - Container filesystem usage tracking disabled for device mapper due to excessive
    IOPS.
  - Ignore `.mount` cgroups, fixing disappearing stats.
* A new field `terminationMessagePolicy` has been added to containers that allows
  a user to request FallbackToLogsOnError, which will read from the container's
  logs to populate the termination message if the user does not write to the

### Node

* Summary of Container Runtime changes:
  * [beta] [cri-tools](https://github.com/kubernetes-incubator/cri-tools): CLI and validation tools for CRI is now v1.0.0-beta.0. This release mainly focused on UX improvements. [@feiskyer]

  - Changed the Pod API so that the `resources` defined for containers are mutable for `cpu` and `memory` resource types.
  - Added `resizePolicy` for containers in a pod to allow users control over how their containers are resized.
  - Added `allocatedResources` field to container status in pod status that describes the node resources allocated to a pod.
  - Added `resources` field to container status that reports actual resources applied to running containers.

- github.com/containerd/containerd/api: [v1.7.19 → v1.8.0](https://github.com/containerd/containerd/compare/api/v1.7.19...api/v1.8.0)
- github.com/containerd/errdefs: [v0.1.0 → v1.0.0](https://github.com/containerd/errdefs/compare/v0.1.0...v1.0.0)
- github.com/containerd/ttrpc: [v1.2.5 → v1.2.6](https://github.com/containerd/ttrpc/compare/v1.2.5...v1.2.6)

    *   Update CRI to kubernetes v1.9.
    *   Bug fixes in validation test suites.
*   [beta] [cri-containerd](https://github.com/kubernetes-incubator/cri-containerd): CRI implementation for containerd is now v1.0.0-beta.0, [[@Random-Liu](https://github.com/Random-Liu)]
    *   This release supports Kubernetes 1.9+ and containerd v1.0.0+.
    *   Pass all Kubernetes 1.9 e2e test, node e2e test and CRI validation tests.