Merge pull request #191397 from sreekzz/patch-1

Update hdinsight-release-notes-archive.md

Author: PRMerger13

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

@@ -4,7 +4,7 @@ description: Archived release notes for Azure HDInsight. Get development tips an
 ms.service: hdinsight
 ms.topic: conceptual
 ms.custom: hdinsightactive, references_regions
-ms.date: 12/27/2021
+ms.date: 03/10/2022
 ---
 
 # Archived release notes
@@ -13,6 +13,19 @@ ms.date: 12/27/2021
 
 Azure HDInsight is one of the most popular services among enterprise customers for open-source Apache Hadoop and Apache Spark analytics on Azure.
 
+## Release date: 12/27/2021
+
+This release applies for HDInsight 4.0. HDInsight release is made available to all regions over several days. The release date here indicates the first region release date. If you don't see below changes, wait for the release being live in your region over several days.
+
+The OS versions for this release are:
+- HDInsight 4.0: Ubuntu 18.04.5 LTS
+
+HDInsight 4.0 image has been updated to mitigate Log4j vulnerability as described in [Microsoft’s Response to CVE-2021-44228 Apache Log4j 2.](https://msrc-blog.microsoft.com/2021/12/11/microsofts-response-to-cve-2021-44228-apache-log4j2/)
+
+> [!Note]
+> * Any HDI 4.0 clusters created post 27 Dec 2021 00:00 UTC are created with an updated version of the image which mitigates the log4j vulnerabilities. Hence, customers need not patch/reboot these clusters.
+> * For new HDInsight 4.0 clusters created between 16 Dec 2021 at 01:15 UTC and 27 Dec 2021 00:00 UTC, HDInsight 3.6 or in pinned subscriptions after 16 Dec 2021 the patch is auto applied within the hour in which the cluster is created, however customers must then reboot their nodes for the patching to complete (except for Kafka Management nodes, which are automatically rebooted).
+
 ## Release date: 07/27/2021
 
 This release applies for both HDInsight 3.6 and HDInsight 4.0. HDInsight release is made available to all regions over several days. The release date here indicates the first region release date. If you don't see below changes, wait for the release being live in your region in several days.