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20240226 release notes (#4133)
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* 20240226 release notes

* 20240226 release notes

* 20240226 release notes

* 20240226 release notes

* 20240226 release notes

* 20240226 release notes

* 20240226 release notes

* 20240226 release notes

* 20240226 release notes

* 20240226 release notes
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shashankbarsin authored Mar 1, 2024
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45 changes: 42 additions & 3 deletions CHANGELOG.md
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# Azure Kubernetes Service Changelog

## Release 2024-02-26

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

### Announcements
* Starting in March, due to Gatekeeper Upstream removing validation for constraint template contents at create/update time, [the Azure Policy addon](https://learn.microsoft.com/azure/governance/policy/concepts/policy-for-kubernetes#install-azure-policy-add-on-for-aks) will now no longer support the validation for constraint template. The Azure Policy Add-On will report [‘InvalidConstraint/Template’ compliance reason code](https://learn.microsoft.com/azure/governance/policy/how-to/determine-non-compliance#aks-resource-provider-mode-compliance-reasons) for detected errors after constraint template admission. This change does not impact [other compliance reason codes](https://learn.microsoft.com/azure/governance/policy/how-to/determine-non-compliance#aks-resource-provider-mode-compliance-reasons). Customers are encouraged to continue to follow best practices when updating Azure Policy for Kubernetes definitions (i.e. [Gator CLI](https://open-policy-agent.github.io/gatekeeper/website/docs/gator/)).
* Starting with Kubernetes 1.29, the default cgroups implementation on Azure Linux AKS nodes is cgroupsv2. Older versions of Java, .NET and NodeJS do not support memory querying v2 memory constraints and this will lead to out of memory (OOM) issues for workloads. Please test your applications for cgroupsv2 compliance, and read the [FAQ](https://learn.microsoft.com/troubleshoot/azure/azure-kubernetes/aks-increased-memory-usage-cgroup-v2) for cgroupsv2.
* AKS patch versions 1.27.9 and 1.28.5 are now available with 1.27.9 used as the default version for new clusters.

### Release notes

* Features
* [Istio-based service mesh addon for AKS](https://learn.microsoft.com/azure/aks/istio-about) is now generally available.

* Preview features
* [AI toolchain operator (KAITO) add-on](https://aka.ms/aks/ai-toolchain-operator) can be enabled to automate large language model (LLM) deployment on your AKS cluster.

* Behavioral change
* `ignoreUnfixed` is now set to `false` in [scanner options](https://eraser-dev.github.io/eraser/docs/customization#scanner-options) for [Image Cleaner](https://learn.microsoft.com/azure/aks/image-cleaner) so that images with vulnerabilities are deleted even if there is no fix/patch available for it yet.
* Label `kubernetes.azure.com/managedby: aks` has been introduced to all managed addon components on cluster. Related issue can be found [here](https://github.com/Azure/AKS/issues/2683)

* Bug fixes
* [Pod overhead](https://kubernetes.io/docs/concepts/containers/runtime-class/#pod-overhead) of memory 2Gi added to `kata-cc-isolation` [RuntimeClass](https://kubernetes.io/docs/concepts/containers/runtime-class/) to address issue where too many pods being created to use too much of the node's memory was resulting in random processes being OOM killed.
* Fixed issue that was causing PUT operations on AKS clusters that were using [Bring your own Container Network Interface (CNI) plugin](https://learn.microsoft.com/azure/aks/use-byo-cni?tabs=azure-cli) to fail when the request didn't contain the `networkProfile.podCIDR` property.
* In AKS clusters of version >= 1.27.0, fixed a race condition in the iptables mode of kube-proxy that could result in some updates getting lost (for example, when a service gets a new endpoint).
* Fixed a race condition that could cause [upgrade from kubenet to Azure CNI Overlay](https://learn.microsoft.com/azure/aks/azure-cni-overlay?tabs=kubectl#kubenet-cluster-upgrade) to fail.

* Component updates
* Istio revision asm-1-20 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). Istio revision asm-1-18 is no longer supported.
* Open Service Mesh upgraded to v1.2.8 with Envoy upgraded to v1.26.7 to address vulnerabilities CVE-2024-23324, CVE-2024-23325, CVE-2024-23322, CVE-2024-23323, and CVE-2024-23327.
* For Node Auto Provisioning, Karpenter is upgraded to [v0.33.0](https://github.com/kubernetes-sigs/karpenter/releases/tag/v0.33.0) and its Azure provider is upgraded to [v0.3.0](https://github.com/Azure/karpenter-provider-azure/releases/tag/v0.3.0).
* Upgraded Azure Disk CSI driver version to [v1.26.9](https://github.com/kubernetes-sigs/azuredisk-csi-driver/releases/tag/v1.26.9) on AKS 1.26, [v1.28.6](https://github.com/kubernetes-sigs/azuredisk-csi-driver/releases/tag/v1.28.6) on AKS 1.27, [v1.29.3](https://github.com/kubernetes-sigs/azuredisk-csi-driver/releases/tag/v1.29.3) on AKS 1.28.
* Upgraded Azure File CSI driver version to [v1.26.11](https://github.com/kubernetes-sigs/azurefile-csi-driver/releases/tag/v1.26.11) on AKS 1.26, [v1.28.8](https://github.com/kubernetes-sigs/azurefile-csi-driver/releases/tag/v1.28.8) on AKS 1.27, [v1.29.3](https://github.com/kubernetes-sigs/azurefile-csi-driver/releases/tag/v1.29.3) on AKS 1.28.
* Upgraded Azure Blob CSI driver version to [v1.21.7](https://github.com/kubernetes-sigs/blob-csi-driver/releases/tag/v1.21.7) on AKS 1.26, [v1.22.5](https://github.com/kubernetes-sigs/blob-csi-driver/releases/tag/v1.22.5) on AKS 1.27, [v1.23.3](https://github.com/kubernetes-sigs/blob-csi-driver/releases/tag/v1.23.3) on AKS 1.28.
* Upgraded `kappie-agent` Linux and Windows images used in [AKS Network Observability](https://learn.microsoft.com/azure/aks/network-observability-overview) to v0.1.4 and v0.1.3 respectively.
* Upgraded ACI provider for the Virtual Kubelet to [v1.6.1](https://github.com/virtual-kubelet/azure-aci/releases/tag/v1.6.1)
* Cilium version has been updated to [1.14.4](https://github.com/cilium/cilium/releases/tag/v1.14.4) for AKS clusters with kubernetes versions >= 1.29.0.
* Azure Linux image has been updated to [Azure Linux - 202402.12.0](vhd-notes/AzureLinux/202402.12.0.txt).
* AKS Ubuntu 22.04 image has been updated to [AKSUbuntu-2204-202402.12.0](vhd-notes/aks-ubuntu/AKSUbuntu-2204/202402.12.0.txt).
* Windows Server 2019 Image has been updated to [Windows Server 2019 - 17763.5458.240218](vhd-notes/AKSWindows/2019/17763.5458.240218.txt).
* Windows Server 2022 Image has been updated to [Windows Server 2022 - 20348.2322.240218](vhd-notes/AKSWindows/2022/20348.2322.240218.txt).

## Release 2024-02-07

Monitor the release status by regions at [AKS-Release-Tracker](https://releases.aks.azure.com/).
Expand All @@ -24,9 +66,6 @@ Monitor the release status by regions at [AKS-Release-Tracker](https://releases.
* Enable [HonorPVReclaimPolicy](https://kubernetes.io/blog/2021/12/15/kubernetes-1-23-prevent-persistentvolume-leaks-when-deleting-out-of-order/#pv-reclaim-policy-with-kubernetes-v1-23) for CSI drivers on AKS 1.27+ to align with upstream behavior.
* Node Auto Provision can now be enabled when aadProfiles, including ServerAppID, ClientAppID, ServerAppSecret, are being set.

* Behavioral Change
* Update the Agentpool Profile protocol to include the new PodIPAllocationMode property.

* Component Updates
* Istio-based service mesh add-on's istiod and ingress images updated to 1.18.7-hotfix.20240210 and 1.19.7 for asm-1-18 and asm-1-19 respectively. User needs to restart the workload pods to trigger re-injection of the newer patch version of istio-proxy. Vulnerabilities CVE-2024-23322, CVE-2024-23323, CVE-2024-23324, CVE-2024-23325, and CVE-2024-23327 have been addressed in these patch versions. More information can be found [here](https://learn.microsoft.com/azure/aks/istio-upgrade).
* For the cloud-provider-node-manager-windows component, the following versions have been updated:
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