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aritraghosh committed Apr 19, 2024
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* 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).
* Kubernetes version 1.32 is the next [Long Term Support Version](https://learn.microsoft.com/azure/aks/long-term-support) after 1.27. Customers will get a minimum 6 months of overlap between 1.27 LTS and 1.32 LTS versions to plan upgrades.
* Kubernetes version 1.26 is now deprecated. Refer to for [platform support](https://learn.microsoft.com/azure/aks/supported-kubernetes-versions?tabs=azure-cli#aks-kubernetes-release-calendar) timeline.
* In 2020 Docker enacted a Rate Limiting policy for all users. In-order to assist customers with the change, Microsoft worked directly with Docker to prevent users of Microsoft Azure from being impacted. "However, beginning on June 30th, 2024, Azure customers will begin to be impacted by this limit. In-order for customers to mitigate the potential effects of this limit. We recommend customers begin to use the Artifact Cache feature within Azure Container Registry or sign up for a Docker Subscription. More information is available [here](https://techcommunity.microsoft.com/t5/apps-on-azure-blog/best-practices-for-using-azure-container-registry-and-docker-hub/ba-p/4068979)
* In 2020 Docker enacted a Rate Limiting policy for all users. In-order to assist customers with the change, Microsoft worked directly with Docker to prevent users of Microsoft Azure from being impacted. However, beginning on June 30th, 2024, Azure customers will begin to be impacted by this limit. In-order for customers to mitigate the potential effects of this limit. We recommend customers begin to use the Artifact Cache feature within Azure Container Registry or sign up for a Docker Subscription. More information is available [here](https://techcommunity.microsoft.com/t5/apps-on-azure-blog/best-practices-for-using-azure-container-registry-and-docker-hub/ba-p/4068979)




### 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.


* Preview 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.
* 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:
* 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 CVE-2024-24786 in the addon.
* 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
* Added resource `nodes/proxy` to `microsoft-defender-operator` role

* Bug Fixes:
* Fixes a bug where put agentpool without a specified version in LTS clusters would have an internal error.
* Fixes a bug where put nodepool 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.
* Clusters running Kubernetes 1.29 or later will have `kubernetes.azure.com/managedby=aks` label to tigera-operator deployment in Calico clusters
* Clusters running Kubernetes 1.29 or later will have `kubernetes.azure.com/managedby=aks` label to tigera-operator deployment in Calico clusters

* 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 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+
* Upgraded Windows containerd v1.7 to v1.7.14 in k8s v1.28+
* Windows Server 2019 Image has been updated to [Windows Server 2019-17763.5696.240410](vhd-notes/AKSWindows/2019/17763.5696.240410.txt) and [Windows Server 2019-17763.5576.240401](vhd-notes/AKSWindows/2019/17763.5576.240401.txt)
* Windows Server 2022 has been updated to [Windows Server 20348.2340.240410](vhd-notes/AKSWindows/2022/20348.2402.240410.txt) and [Windows Server 2022-20348.2340.240401](vhd-notes/AKSWindows/2022/20348.2340.240401.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)
* Azure Linux image has been updated to [Azure Linux 202404.01.0](vhd-notes/AzureLinux/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)
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