- API Server Tracing now includes a variety of new spans and span events. ([#113172](https://github.com/kubernetes/kubernetes/pull/113172), [@dashpole](https://github.com/dashpole)) [SIG API Machinery, Architecture, Auth, Instrumentation, Network, Node and Scheduling]

    /** The key of the configuration. e.g. false */
    String QUERY_HIGHLIGHT_FORCE_SOURCE = "query.highlight.force.source";

    /** The key of the configuration. e.g. span */
    String QUERY_HIGHLIGHT_FRAGMENTER = "query.highlight.fragmenter";

    /** The key of the configuration. e.g. -1 */
    String QUERY_HIGHLIGHT_FRAGMENT_OFFSET = "query.highlight.fragment.offset";

- APIServerTracing now collects spans from etcd client calls, and propagates context to etcd. ([#103216](https://github.com/kubernetes/kubernetes/pull/103216), [@dashpole](https://github.com/dashpole)) [SIG API Machinery, Cloud Provider and Instrumentation]

### **Network**

#### **IPv6**

*   [alpha] IPv6 support has been added. Notable IPv6 support details include:
    *   Support for IPv6-only Kubernetes cluster deployments. **<span style="text-decoration:underline;">Note:</span>** This feature does not provide dual-stack support.
    *   Support for IPv6 Kubernetes control and data planes.
    *   Support for Kubernetes IPv6 cluster deployments using kubeadm.

  correctly with an external cloud provider. ([#124516](https://github.com/kubernetes/kubernetes/pull/124516), [@danwinship](https://github.com/danwinship))
- Fixed an issue that prevents the linking of trace spans for requests that are proxied through kube-aggregator. ([#124189](https://github.com/kubernetes/kubernetes/pull/124189), [@toddtreece](https://github.com/toddtreece))

status reflects the aggregate status across all underlying cluster
jobs.

#### [alpha] Federated Horizontal Pod Autoscaling (HPA)

Federated HPAs are similar to the traditional Kubernetes HPAs, except
that they span multiple clusters. Creating a Federated HPA targeting
multiple clusters ensures that cluster-level autoscalers are
consistently deployed across those clusters, and dynamically managed