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Monitor the release status by regions at [AKS-Release-Tracker](https://releases.aks.azure.com/).

### Announcements
- [Dual-stack networking (IPv4/IPv6) with CNI Overlay](https://learn.microsoft.com/en-us/azure/aks/azure-cni-overlay?tabs=kubectl#dual-stack-networking) is now generally available (GA) for Linux node pools and does not need the Azure Feature Flag registered on the subscription.
* AKS will be fixing a behavior where manually added Labels, Taints and Annotations are incorrectly copied to surged upgrade nodes. To ensure any Label or Taint is present in new nodes please use the [Labels and/or Taints](https://learn.microsoft.com/azure/aks/use-labels) functionality provided by AKS.
* Support upgrade version skew policy between core node and control plane components from n-2 to n-3 to match [related upstream policy change starting Kubernetes version 1.28](https://kubernetes.io/blog/2023/08/15/kubernetes-v1-28-release/) AKS docs available [here](https://learn.microsoft.com/azure/aks/supported-kubernetes-versions?tabs=azure-cli#what-is-the-allowed-difference-in-versions-between-control-plane-and-node-pool).
* Starting 1.30 Kubernetes version and 1.27 LTS versions, beta apis will be disabled by default, when you upgrade to [them](https://learn.microsoft.com/azure/aks/upgrade-aks-cluster?tabs=azure-cli#before-you-begin). There will be an option provided to explicitly enable beta apis closer to the 1.30 release.
* On 15 March 2027, Windows Server 2022 will be retired when Kubernetes 1.34 reaches the end of platform support. You won't be able to create new Windows Server 2022 node pools on Kubernetes 1.35 and above. We encourage you to make the switch before 15 March 2027 to gain the richer benefits of [Windows Server 2025](https://techcommunity.microsoft.com/t5/windows-server-news-and-best/introducing-windows-server-2025/ba-p/4026374) or Windows Server [Annual Channel](https://techcommunity.microsoft.com/t5/windows-server-news-and-best/windows-server-annual-channel-for-containers/ba-p/3866248). These new Windows OS versions will be supported on AKS before Windows Server 2022 is retired. For more updates, see our [AKS public roadmap](https://github.com/Azure/AKS/projects/1).

### Release Notes

* Features:

* [Dual-stack networking (IPv4/IPv6) with CNI Overlay](https://learn.microsoft.com/azure/aks/azure-cni-overlay?tabs=kubectl#dual-stack-networking) is now generally available (GA) for Linux node pools and does not need the Azure Feature Flag registered on the subscription.
* The service mesh add-on now skips validation of its compatibility with cluster version unless mesh upgrade or cluster upgrade is attempted.
* Using [Alias Minor Version](https://learn.microsoft.com/azure/aks/supported-kubernetes-versions?tabs=azure-cli#alias-minor-version) is now allowed on preview versions.

* Preview Features:




* Behavioral Changes:
- Clusters running Kubernetes 1.29 or later will have kubernetes.azure.com/managedby=aks label to tigera-operator deployment in Calico clusters
- This introduces the constraint template validation behavior change called out in November's release notes
* Clusters running Kubernetes 1.29 or later will have kubernetes.azure.com/managedby=aks label to tigera-operator deployment in Calico clusters
* This introduces the constraint template validation behavior change called out in November's release notes
[2023-11-28](https://github.com/Azure/AKS/releases/tag/2023-11-28) . It also improves cleanup of the addon, as called out in Issue [#3541](https://github.com/Azure/AKS/issues/3541) , and patches a CVE in the addon.
- Adds [App routing](https://learn.microsoft.com/en-us/azure/aks/app-routing?tabs=default%2Cdeploy-app-default) to excluded namespaces for policy when the addon is enabled
- Toggle OSI clusters with 3.1.17 for autoscale
- Added permissions to nodes/proxy Kubernetes resource for Microsoft.Security/pricings/microsoft-defender-operator role
- The service mesh add-on now skips validation of its compatibility with cluster version unless mesh upgrade or cluster upgrade is attempted.
- Using [Alias Minor Version](https://learn.microsoft.com/en-us/azure/aks/supported-kubernetes-versions?tabs=azure-cli#alias-minor-version) is now allowed on preview versions.
* Adds [App routing](https://learn.microsoft.com/azure/aks/app-routing?tabs=default%2Cdeploy-app-default) to excluded namespaces for policy when the addon is enabled
* Toggle OSI clusters with 3.1.17 for autoscale
* Added resource `nodes/proxy` to `microsoft-defender-operator` role
* The service mesh add-on now skips validation of its compatibility with cluster version unless mesh upgrade or cluster upgrade is attempted.
* Using [Alias Minor Version](https://learn.microsoft.com/azure/aks/supported-kubernetes-versions?tabs=azure-cli#alias-minor-version) is now allowed on preview versions.


* Bug Fixes:
- Fixes a bug where put agentpool without a specified version in lts clusters would have an internal error.
- Skips verification of the CNI files installed by the Azure CNS daemonset. This change is made to avoid a race condition observed where components like LinkerD and Istio doing CNI chaining mutate the CNI conflict after its written, causing the validation that the file was written correctly to fail.
- Error message improved to specify that it is only allowed to update public SSH key in preview API versions.
*Fixes a bug where put agentpool without a specified version in lts clusters would have an internal error.
* Error message improved to specify that it is only allowed to update public SSH key in preview API versions.

* Component Updates:
- Upgraded Azure file CSI driver to [v1.29.4](https://github.com/kubernetes-sigs/azurefile-csi-driver/releases/tag/v1.29.4) on AKS 1.28, [v1.30.1](https://github.com/kubernetes-sigs/azurefile-csi-driver/releases/tag/v1.30.1) on AKS 1.29
- Upgraded Azure Blob CSI driver to [v1.23.4](https://github.com/kubernetes-sigs/blob-csi-driver/releases/tag/v1.23.4) on AKS 1.28 and 1.29
- Upgraded extension manager to [v1.15.3](https://github.com/azure-core/ClusterConfigurationAgent/releases/tag/v1.15.3)
- Azure Monitor Metrics April release to [v.6.8.7](https://github.com/Azure/prometheus-collector/blob/main/RELEASENOTES.md#release-04-08-2024)
- Istio revision asm-1-21 is now available with Istio-based service mesh add-on. More information on performing canary upgrade for the new minor revision of Istio can be found [here](https://learn.microsoft.com/en-us/azure/aks/istio-upgrade)
- Bump Windows containerd v1.7 to v1.7.14 in k8s v1.28+
- Bump Windows image versions to 2024.03B
- Cached new image version for csi, cni, containerinsights, cloud-node-manager.
- Security Intelligence Update for Microsoft Defender Antivirus is upgraded from 1.407.466.0 to 1.407.870.0.
- Windows Server 2019 Image has been updated to [Windows Server 2019-17763.5696.240410](https://github.com/Azure/AgentBaker/blob/master/vhdbuilder/release-notes/AKSWindows/2019-containerd/17763.5696.240410.txt)
- Windows Server 2022 has been updated to [Windows Server Gen2 20348.2340.240401 ](https://github.com/Azure/AgentBaker/blob/master/vhdbuilder/release-notes/AKSWindows/2022-containerd-gen2/20348.2340.240401.txt), [Windows Server Gen1 20348.2340.240401](https://github.com/Azure/AgentBaker/blob/master/vhdbuilder/release-notes/AKSWindows/2022-containerd/20348.2340.240401.txt)

- Azure Linux image has been updated to [Azure Linux 202404.01.0](vhd-notes/AzureLinux/202404.01.0.txt).
- AKS Ubuntu 18.04 image has been updated to [AKSUbuntu-1804-202404.01.0](vhd-notes/aks-ubuntu/AKSUbuntu-1804/202404.01.0.txt)
- AKS Ubuntu 22.04 image has been updated to [AKSUbuntu-2204-202404.01.0](vhd-notes/aks-ubuntu/AKSUbuntu-2204/202404.01.0.txt)
- Upgraded container insights agent to [v3.1.19](https://github.com/microsoft/Docker-Provider/releases/tag/3.1.19)
- Upgraded Kaito toggle for release [v0.2.2](https://github.com/Azure/kaito/releases/tag/v0.2.2)


* Upgraded Azure file CSI driver to [v1.29.4](https://github.com/kubernetes-sigs/azurefile-csi-driver/releases/tag/v1.29.4) on AKS 1.28, [v1.30.1](https://github.com/kubernetes-sigs/azurefile-csi-driver/releases/tag/v1.30.1) on AKS 1.29
* Upgraded Azure Blob CSI driver to [v1.23.4](https://github.com/kubernetes-sigs/blob-csi-driver/releases/tag/v1.23.4) on AKS 1.28 and 1.29
* Upgraded extension manager to [v1.15.3](https://github.com/azure-core/ClusterConfigurationAgent/releases/tag/v1.15.3)
* Upgraded Azure Monitor Metrics April release to [v.6.8.7](https://github.com/Azure/prometheus-collector/blob/main/RELEASENOTES.md#release-04-08-2024)
* Istio revision asm-1-21 is now available with Istio-based service mesh add-on. More information on performing canary upgrade for the new minor revision of Istio can be found [here](https://learn.microsoft.com/azure/aks/istio-upgrade)
* Bump Windows containerd v1.7 to v1.7.14 in k8s v1.28+
* Published Windows image version 2024.03B on 04/01 and 2024.04B on 04/10
* Windows Server 2019 Image has been updated to [Windows Server 2019-17763.5696.240410](vh-notes/AKSWindows/2019/17763.5696.240410.txt)
* Windows Server 2022 has been updated to [Windows Server Gen2 20348.2340.240401 ](vhd-notes/AKSWindows/2022/20348.2402.240410.txt)
* Azure Linux image has been updated to [Azure Linux 202404.01.0](vhd-notes/AzureLinux/202404.01.0.txt).
* AKS Ubuntu 18.04 image has been updated to [AKSUbuntu-1804-202404.01.0](vhd-notes/aks-ubuntu/AKSUbuntu-1804/202404.01.0.txt)
* AKS Ubuntu 22.04 image has been updated to [AKSUbuntu-2204-202404.01.0](vhd-notes/aks-ubuntu/AKSUbuntu-2204/202404.01.0.txt)
* Upgraded Azure Monitor Container Insights image to [v3.1.19](https://github.com/microsoft/Docker-Provider/releases/tag/3.1.19)
*Upgraded Kaito images to [v0.2.2](https://github.com/Azure/kaito/releases/tag/v0.2.2)

## Release 2024-03-31

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