PXC-4528 [DOCS] - release notes for PXC 8.0.40

modified: docs/copyright-and-licensing-information.md new file: docs/release-notes/8.0.40-31.md modified: docs/release-notes/release-notes_index.md modified: mkdocs-base.yml modified: variables.yml
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diff --git a/docs/copyright-and-licensing-information.md b/docs/copyright-and-licensing-information.md
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 ## Documentation licensing
 
-Percona XtraDB Cluster documentation is (C)2009-2023 Percona LLC and/or its affiliates and is distributed under the [Creative Commons Attribution 4.0 International License](https://creativecommons.org/licenses/by/4.0/).
+Percona XtraDB Cluster documentation is (C)2009-2025 Percona LLC and/or its affiliates and is distributed under the [Creative Commons Attribution 4.0 International License](https://creativecommons.org/licenses/by/4.0/).
diff --git a/docs/release-notes/8.0.40-31.md b/docs/release-notes/8.0.40-31.md
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+# Percona XtraDB Cluster 8.0.40-31 (2025-01-20)
+
+[Get started with Quickstart Guide for Percona XtraDB Cluster.](../quickstart-overview.md)
+
+Percona XtraDB Cluster 8.0.40-31 includes all the features and bug fixes available in Percona Server for MySQL 8.0.40-31.
+
+## Release highlights
+
+Percona XtraDB Cluster is based on Percona Server for MySQL. Find a complete list of improvements and bug fixes in the [Percona Server for MySQL 8.0.40-31 (2024-12-30) release notes](https://docs.percona.com/percona-server/8.0/release-notes/8.0.40-31.html).
+
+Improvements and bug fixes provided by Oracle for  MySQL 8.0.40 and included in Percona Server for MySQL are the following:
+
+* Changes in MySQL 8.0.33 caused queries using joins on InnoDB tables to perform worse because refactoring affected functions that were previously inline.
+
+* An unexpected exit ocurred if the server tried to update columns altered with NULL as the default value using the INSTANT algorithm.
+
+* An unexpected exit during DELETE or UPDATE operations if a column, using the INSTANT algorithm, was dropped.
+
+* Importing a table created under a different `sql_mode` sometimes led to schema mismatches, risking data corruption in secondary indexes. The fix now includes integrity checks on the imported tablespace.
+
+* Rebuilding tables with secondary indexes required more file I/O operations compared to MySQL 8.0.26, which slowed down query performance.
+
+Find the complete list of bug fixes and changes in the [MySQL 8.0.40 Release Notes](https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-40.html).
+
+## Bug fixes
+
+[PXC-4558](https://perconadev.atlassian.net/browse/PXC-4558): During the post-processing step in `wsrep_sst_common`, the script connected to mysql-server to check replication status via the upgrade_socket. Since mysql-server was started with --skip-networking, mysql could only connect to mysql-server with socket. When the host was set to `127.0.0.1` in `.mylogin.cnf`, the post-processing step failed.
+
+## Additional resources
+
+Download product binaries, packages, and tarballs at [Percona Product Downloads](https://www.percona.com/downloads)
+
+[Install Percona XtraDB Cluster](../install-index.md)
+
+The [Percona XtraDB Cluster GitHub repository](https://github.com/percona/percona-xtradb-cluster)
+
+[Contribute to the documentation](https://github.com/percona/pxc-docs/blob/8.0/contributing.md)
+
+For [training](https://www.percona.com/training), contact [Percona Training - Start learning now](https://learn.percona.com/contact-me).
diff --git a/docs/release-notes/release-notes_index.md b/docs/release-notes/release-notes_index.md
@@ -1,5 +1,7 @@
 # Percona XtraDB Cluster 8.0 release notes index
 
+* [Percona XtraDB Cluster 8.0.40-31 (2025-01-20)](8.0.40-31.md)
+
 * [Percona XtraDB Cluster 8.0.39-30 (2024-12-02)](8.0.39-30.md)
 
 * [Percona XtraDB Cluster 8.0.38](8.0.38.md)

diff --git a/mkdocs-base.yml b/mkdocs-base.yml
@@ -126,7 +126,7 @@ plugins:
   with-pdf: # https://github.com/orzih/mkdocs-with-pdf
           output_path: '_pdf/PerconaXtradbCluster-8.0.pdf'
           cover_title: 'Percona XtraDB Cluster Documentation'
-          cover_subtitle: 8.0.39-30 (2024-12-02)
+          cover_subtitle: 8.0.40-31 (2025-01-20)
           author: 'Percona Technical Documentation Team'
           cover_logo: docs/_static/Percona_Logo_Color.png
           debug_html: false
@@ -147,6 +147,7 @@ nav:
   - get-help.md
   - Release notes:
       - Release notes index: release-notes/release-notes_index.md
+      - release-notes/8.0.40-31.md
       - release-notes/8.0.39-30.md
       - release-notes/8.0.38.md
       - release-notes/8.0.37-29.md

diff --git a/variables.yml b/variables.yml
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 # variables for HTML output
 
-release: '8.0.39-30'
+release: '8.0.40-31'
 version: '8.0'
-release_date: '2024-12-02'
-title_date: '2024-11-28'
+release_date: '2025-01-20'
+title_date: '2025-01-20'
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		## Documentation licensing

		Percona XtraDB Cluster documentation is (C)2009-2023 Percona LLC and/or its affiliates and is distributed under the [Creative Commons Attribution 4.0 International License](https://creativecommons.org/licenses/by/4.0/).
		Percona XtraDB Cluster documentation is (C)2009-2025 Percona LLC and/or its affiliates and is distributed under the [Creative Commons Attribution 4.0 International License](https://creativecommons.org/licenses/by/4.0/).