* Mark image as deliberately optional in v1 Container struct.  Many objects in the Kubernetes API inherit the container struct and only Pods require the field to be set. ([#48406](https://github.com/kubernetes/kubernetes/pull/48406), [@gyliu513](https://github.com/gyliu513))

* Mark image as deliberately optional in v1 Container struct.  Many objects in the Kubernetes API inherit the container struct and only Pods require the field to be set. ([#48406](https://github.com/kubernetes/kubernetes/pull/48406), [@gyliu513](https://github.com/gyliu513))

# Release 2.5.0

## Major Features and Improvements

*   Support for Python3.9 has been added.
*   `tf.data`:
    *   `tf.data` service now supports strict round-robin reads, which is useful
        for synchronous training workloads where example sizes vary. With strict
        round robin reads, users can guarantee that consumers get similar-sized
        examples in the same step.

- `klog` text output now uses JSON as encoding for structs, maps and slices. ([#117687](https://github.com/kubernetes/kubernetes/pull/117687), [@pohly](https://github.com/pohly))
- `kube-proxy` in iptables mode will now have separate `sync_full_proxy_rules_duration_seconds`\nand

- Introduced a breaking change to the `resource.k8s.io` API in its `AllocationResult` struct. This change allows a kubelet plugin for the `DynamicResourceAllocation` feature to service allocations from multiple resource driver controllers. ([#116332](https://github.com/kubernetes/kubernetes/pull/116332), [@klueska](https://github.com/klueska))...

- Promoted meta.k8s.io/v1beta1 Table and PartialObjectMetadata to v1. ([#77136](https://github.com/kubernetes/kubernetes/pull/77136), [@smarterclayton](https://github.com/smarterclayton))

- The `PodDeletionCost` feature has been promoted to beta, and enabled by default. ([#101080](https://github.com/kubernetes/kubernetes/pull/101080), [@ahg-g](https://github.com/ahg-g))
- The `Server Side Apply` treats certain structs as atomic. Meaning the entire selector field is managed by a single writer and updated together. ([#100684](https://github.com/kubernetes/kubernetes/pull/100684), [@Jefftree](https://github.com/Jefftree))

- Fixed scheduling of **CronJob** with `@every X` schedules. ([#109250](https://github.com/kubernetes/kubernetes/pull/109250), [@d-honeybadger](https://github.com/d-honeybadger))
- Fixed strict server-side field validation treating `metadata` fields as unknown fields. ([#109268](https://github.com/kubernetes/kubernetes/pull/109268), [@liggitt](https://github.com/liggitt))

* apply falls back to generic 3-way JSON merge patch if no go struct is registered for the target GVK ([#40666](https://github.com/kubernetes/kubernetes/pull/40666), [@ymqytw](https://github.com/ymqytw))

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