docs: deprecate OpenStack DOC-2312 (#8381)

* docs: deprecate OpenStack DOC-2312

* docs: add to release notes

* docs: fix vale

* Update docs/docs-content/release-notes/announcements.md

Co-authored-by: Ben Radstone <[email protected]>

* Update docs/docs-content/release-notes/release-notes.md

Co-authored-by: Ben Radstone <[email protected]>

* ci: auto-formatting prettier issues

---------

Co-authored-by: Ben Radstone <[email protected]>

Author: addetz

docs/docs-content/release-notes/announcements.md

@@ -33,8 +33,9 @@ necessary actions to avoid any disruptions in your environment.
 
 | Change                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | Target Removal Date | Published Date   |
 | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------- | ---------------- |
+| [OpenStack](../clusters/data-center/openstack.md) support in Palette is now deprecated and will be removed in a future release. After removal, you will no longer be able to create and manage OpenStack clusters, cluster profiles, cloud accounts, or Private Cloud Gateways. We recommend migrating your workloads to another supported [Data Center environment](../clusters/data-center/data-center.md).                                                                                                                                                                                                                                                                                                                                          | April 4, 2026       | October 18, 2025 |
 | [EKS-optimized Amazon Linux 2 (AL2) AMIs](https://docs.aws.amazon.com/eks/latest/userguide/eks-ami-deprecation-faqs.html) will be disabled in Palette from January 10, 2026 and removed on 4 April, 2026. When disabled, you will no longer be able to select the AL2 AMIs for EKS worker nodes in Palette for new clusters. For existing clusters, you must create new worker nodes using AL2023 AMIs. Existing AL2 AMI worker nodes will no longer receive bug fixes or security patches after the removal date. Refer to our [Scenario - Unable to Upgrade EKS Worker Nodes from AL2 to AL2023](../troubleshooting/cluster-deployment.md#scenario---unable-to-upgrade-eks-worker-nodes-from-al2-to-al2023) guide for help with migrating workloads. | April 4, 2026       | October 18, 2025 |
-| The [Palette Edge CLI](../downloads/cli-tools.md#palette-edge-cli) is deprecated and will be removed in a future release. We recommend using the [Palette CLI](../automation/palette-cli/palette-cli.md) for the creation and management of content bundles. Refer to the [Build Content Bundle](../clusters/edge/edgeforge-workflow/palette-canvos/build-content-bundle.md) guide for further information.                                                                                                                                                                                                                                                                                                                                            | _To be announced_   | May 25, 2025     |
+| The [Palette Edge CLI](../downloads/cli-tools.md#palette-edge-cli) is deprecated and will be removed in a future release. We recommend using the [Palette CLI](../automation/palette-cli/palette-cli.md) for the creation and management of content bundles. Refer to the [Build Content Bundle](../clusters/edge/edgeforge-workflow/palette-canvos/build-content-bundle.md) guide for further information.                                                                                                                                                                                                                                                                                                                                            | April 4, 2026       | May 25, 2025     |
 | The `stylus.installationMode` [Edge Installer Configuration](../clusters/edge/edge-configuration/installer-reference.md) flag is deprecated. We recommend using the `stylus.managementMode` flag instead, which has two allowed values: `central`, which means the Edge host is connected to Palette, and `local`, which means the Edge host has no connection to a Palette instance. Refer to the [Prepare User Data](../clusters/edge/edgeforge-workflow/prepare-user-data.md) guide for further information.                                                                                                                                                                                                                                        | December 6, 2025    | May 25, 2025     |
 
 ## Removals

docs/docs-content/release-notes/release-notes.md

@@ -78,6 +78,11 @@ tags: ["release-notes"]
 
 #### Deprecations and Removals
 
+- [OpenStack](../clusters/data-center/openstack.md) support in Palette is now deprecated and will be removed in a future
+  release. After removal, you will no longer be able to create and manage OpenStack clusters, cluster profiles, cloud
+  accounts, or Private Cloud Gateways. We recommend migrating your workloads to another supported
+  [Data Center environment](../clusters/data-center/data-center.md).
+
 - [EKS-optimized Amazon Linux 2 (AL2) AMIs](https://docs.aws.amazon.com/eks/latest/userguide/eks-ami-deprecation-faqs.html)
   will be disabled in Palette from January 10, 2026 and removed on April 4, 2026. When disabled, you will no longer be
   able to select the AL2 AMIs for EKS worker nodes in Palette for new clusters. For existing clusters, you must create