Update HDInsight release notes for October 2025

articles/hdinsight/hdinsight-release-notes-archive.md

@@ -6,7 +6,7 @@ ms.topic: conceptual
 author: yeturis
 ms.author: sairamyeturi
 ms.reviewer: nijelsf
-ms.date: 05/28/2025
+ms.date: 10/06/2025
 ms.custom:
   - hdinsightactive
   - references_regions
@@ -24,7 +24,7 @@ To subscribe, click the “watch” button in the banner and watch out for [HDIn
 
 ## Release Information
 
-### Release date: Apr 28, 2025
+### Release date: May 28, 2025
 
 > [!NOTE]
 > This is a Hotfix / maintenance release for Resource Provider. For more information see, [Resource Provider](.//hdinsight-overview-versioning.md#hdinsight-resource-provider).
@@ -56,15 +56,72 @@ For workload specific versions, see [HDInsight 5.x component versions](./hdinsig
 
 ## Issues fixed
 
+* Authentication issue for SQL databases when managed identity is used.
+
+## Updates
+
+* Active PIN requests for creating HDInsight clusters with predetermined image versions stand revoked/cancelled as of 26 May 2025. Customers can only create clusters using the updated (compliant) images of each HDInsight version. This measure is intended to improve cluster security and prevent potential issues with clusters and gateway nodes. 
+
+## Reminder
+
+* HDInsight service has transitioned to use standard load balancers for all its cluster configurations due to [deprecation announcement](https://azure.microsoft.com/updates/azure-basic-load-balancer-will-be-retired-on-30-september-2025-upgrade-to-standard-load-balancer#main) of Azure basic load balancer.
+
+  > [!IMPORTANT]
+  > By default, creation of any new HDInsight cluster happens with Standard Load Balancers. We recommend referring to the [migration guide to recreate the cluster](./load-balancer-migration-guidelines.md).
+  > For any assistance, contact [support](https://portal.azure.com/#blade/Microsoft_Azure_Support/HelpAndSupportBlade/overview).
+
+If you have any more questions, contact [Azure Support](https://ms.portal.azure.com/#view/Microsoft_Azure_Support/HelpAndSupportBlade/~/overview).
+
+You can always ask us about HDInsight on [Azure HDInsight - Microsoft Q&A](/answers/tags/168/azure-hdinsight).
+
+We're listening: You’re welcome to add more ideas and other topics here and vote for them - [HDInsight Ideas](https://feedback.azure.com/d365community/search/?q=HDInsight) and follow us for more updates on [AzureHDInsight Community](https://www.linkedin.com/groups/14313521/).
+
+> [!NOTE]
+> We advise customers to use to latest versions of HDInsight [Images](./view-hindsight-cluster-image-version.md) as they bring in the best of open source updates,  Azure updates, and security fixes. For more information, see, [Best practices](./hdinsight-overview-before-you-start.md).
+
+
+
+### Release date: Apr 28, 2025
+
+> [!NOTE]
+> This is a Hotfix / maintenance release for Resource Provider. For more information see, [Resource Provider](.//hdinsight-overview-versioning.md#hdinsight-resource-provider).
+
+Azure HDInsight periodically releases maintenance updates for delivering bug fixes, performance enhancements, and security patches ensuring you stay up to date with these updates guarantees optimal performance and reliability.
+
+This release note applies to
+
+:::image type="icon" source="./media/hdinsight-release-notes/yes-icon.svg" border="false"::: HDInsight 5.1 version.
+
+:::image type="icon" source="./media/hdinsight-release-notes/yes-icon.svg" border="false"::: HDInsight 5.0 version.
+
+:::image type="icon" source="./media/hdinsight-release-notes/yes-icon.svg" border="false"::: HDInsight 4.0 version. 
+
+HDInsight release will be available to all regions over several days. This release note is applicable for image number **2501080039**. [How to check the image number?](./view-hindsight-cluster-image-version.md)
+
+HDInsight uses safe deployment practices, which involve gradual region deployment. It might take up to 10 business days for a new release or a new version to be available in all regions.
+
+**OS versions**
+
+* HDInsight 5.1: Ubuntu 18.04.5 LTS Linux Kernel 5.4
+* HDInsight 5.0: Ubuntu 18.04.5 LTS Linux Kernel 5.4
+* HDInsight 4.0: Ubuntu 18.04.5 LTS Linux Kernel 5.4
+
+> [!NOTE]
+> Ubuntu 18.04 is supported under [Extended Security Maintenance(ESM)](https://techcommunity.microsoft.com/t5/linux-and-open-source-blog/canonical-ubuntu-18-04-lts-reaching-end-of-standard-support/ba-p/3822623) by the Azure Linux team for [Azure HDInsight July 2023](/azure/hdinsight/hdinsight-release-notes-archive#release-date-july-25-2023), release onwards. 
+
+For workload specific versions, see [HDInsight 5.x component versions](./hdinsight-5x-component-versioning.md).
+
+### Issues fixed
+
 * Managed identity-based authentication for WASB encounters issues when network ACL is enabled on storage.
 * Managed identity-based authentication for SQL databases encounters issues when availability zones are used.
 * Multiple security fixes.
 
-## Updates
+### Updates
 
 * Active PIN requests for creating HDInsight clusters with predetermined image versions will be revoked/cancelled on 26 May 2025. Beyond this date, customers will only be able to create clusters using the updated (compliant) images of each HDInsight version. This measure is intended to improve cluster security and prevent potential issues with clusters and gateway nodes. 
 
-## Reminder
+### Reminder
 
 * HDInsight service transitioned to use standard load balancers for all its cluster configurations due to [deprecation announcement](https://azure.microsoft.com/updates/azure-basic-load-balancer-will-be-retired-on-30-september-2025-upgrade-to-standard-load-balancer#main) of Azure basic load balancer.