percona · alina-derkach-oaza · May 22, 2026
diff --git a/docs/release-notes/8.4.0-6.md b/docs/release-notes/8.4.0-6.md
@@ -0,0 +1,59 @@
+# Percona XtraBackup 8.4.0-6 (2026-05-)
+
+Get started with [Quickstart Guide for Percona XtraBackup].
+
+## Release highlights
+
+Percona XtraBackup 8.4.0-6 release includes new features, improvements and bug fixes.
+
+* Percona XtraBackup introduces the [`--check-tables`](../innodb-btree-check.md) option to validate the structural integrity of InnoDB B-tree indexes during the [`--prepare`](xtrabackup-option-reference.md#prepare) phase. Validation during `--prepare` helps detect corrupted indexes before restore or production deployment.
+
+* Percona XtraBackup introduces [backup size reporting](../backup-size-reporting.md) for successful backups. Percona XtraBackup now records backup size in `xtrabackup_info` and reports the same information in the XtraBackup error log. Backup size reporting helps estimate storage requirements, check that backups work correctly, and plan restores for compressed and streamed backups.
+
+* Percona XtraBackup adds support for Azure Storage accounts with [Hierarchical Namespace (HNS)](https://learn.microsoft.com/en-us/azure/storage/blobs/data-lake-storage-namespace) enabled in `xbcloud delete`. Percona XtraBackup now correctly removes backups from Azure Data Lake Storage Gen2 environments where deletion previously failed due to unsupported HNS behavior.
+
+* Percona XtraBackup improves `--copy-back` and `--move-back` handling for backups created from servers with non-default InnoDB configuration paths. Percona XtraBackup now automatically processes configuration values stored in `backup-my.cnf`, avoiding restore failures caused by custom `innodb_data_file_path` and related settings.
+
+* Percona XtraBackup improves sparse file handling efficiency by removing redundant `fallocate(PUNCH_HOLE)` calls from `local_write_sparse`.
+
+* Percona XtraBackup improves incremental backup speed for instances containing around one million tables, reducing the time required for incremental backups to complete.
+
+We recommend that you download the Percona XtraBackup for the same platform as the MySQL-compatible server. For example, if your server is on an ARM64 platform, you should download and use the Percona XtraBackup for ARM64 for that operating system.
+
+## New features
+
+[PXB-3328](https://perconadev.atlassian.net/browse/PXB-3328): Adds the `--check-tables` option to validate InnoDB B-tree index integrity during the `--prepare` phase. The option detects structural corruption in backup files before restore or deployment.
+
+[PXB-3747](https://perconadev.atlassian.net/browse/PXB-3747): Adds backup size reporting for successful backups. Percona XtraBackup now records backup size in `xtrabackup_info` and reports the same information in the XtraBackup error log.
+
+## Improvements
+
+[PXB-3643](https://perconadev.atlassian.net/browse/PXB-3643): Adds support for Azure Storage accounts with [Hierarchical Namespace (HNS)](https://learn.microsoft.com/en-us/azure/storage/blobs/data-lake-storage-namespace) enabled in `xbcloud delete`. Percona XtraBackup now correctly removes backups from Azure Data Lake Storage Gen2 environments where deletion previously failed due to unsupported HNS behavior.
+
+[PXB-3458](https://perconadev.atlassian.net/browse/PXB-3458): Improves `--copy-back` and `--move-back` handling for backups created from servers with non-default InnoDB configuration paths. Percona XtraBackup now automatically processes configuration values stored in `backup-my.cnf`, avoiding restore failures caused by custom `innodb_data_file_path` and related settings.
+
+[PXB-3658](https://perconadev.atlassian.net/browse/PXB-3658): Improves sparse file handling efficiency by removing redundant `fallocate(PUNCH_HOLE)` calls from `local_write_sparse`.
+
+## Bug fixes
+
+[PXB-3568](https://perconadev.atlassian.net/browse/PXB-3568): Fixed an issue where `xtrabackup` terminated unexpectedly on RHEL 9 when using `--compress=lz4`.
+
+[PXB-3759](https://perconadev.atlassian.net/browse/PXB-3759): Fixed an issue where `xtrabackup` terminated unexpectedly when redo log encryption was enabled and `innodb_log_buffer_size` exceeded 16 MB.
+
+[PXB-3762](https://perconadev.atlassian.net/browse/PXB-3762): Fixed an issue where `xtrabackup --backup --transition-key` terminated unexpectedly on servers where undo tablespace encryption keys existed only in redo logs.
+
+[PXB-3543](https://perconadev.atlassian.net/browse/PXB-3543): Fixed an issue where incremental backups on instances containing around one million tables completed significantly slower than expected.
+
+## Packaging notes
+
+* Percona XtraBackup 8.4 adds support for Ubuntu 26.04.
+
+## Additional resources
+
+Install [Percona XtraBackup 8.4.0-6](..//installation.md)
+
+The [Percona XtraBackup GitHub repository](https://github.com/percona/percona-xtrabackup)
+
+Download product binaries, packages, and tarballs at [Percona Product Downloads](https://www.percona.com/downloads/)
+
+[Quickstart Guide for Percona XtraBackup]: ..//quickstart-overview.md
diff --git a/docs/release-notes/release-notes.md b/docs/release-notes/release-notes.md
@@ -1,5 +1,7 @@
 # Percona XtraBackup {{vers}} release notes index
 
+* [Percona XtraBackup 8.4.0-6 (2026-05-)](8.4.0-6.md)
+
 * [Percona XtraBackup 8.4.0-5 (2025-12-17)](8.4.0-5.md)
 
 * [Percona XtraBackup 8.4.0-4 (2025-08-21)](8.4.0-4.md)

diff --git a/docs/templates/pdf_cover_page.tpl b/docs/templates/pdf_cover_page.tpl
@@ -7,5 +7,5 @@
 {% if config.site_description %}
 <h1>{{ config.site_description }}</h1>
 {% endif %} 
-<h2>8.4.0-5 (December 17, 2025)</h2>
+<h2>8.4.0-6 (May , 2026)</h2>
 <!--<h3>Percona Technical Documentation Team</h3>-->
diff --git a/mkdocs-base.yml b/mkdocs-base.yml
@@ -170,6 +170,7 @@ nav:
   - get-help.md
   - Release notes:
     - Release notes index: release-notes/release-notes.md
+    - release-notes/8.4.0-6.md
     - release-notes/8.4.0-5.md
     - release-notes/8.4.0-4.md
     - release-notes/8.4.0-3.md

diff --git a/variables.yml b/variables.yml
@@ -1,9 +1,9 @@
 # variables for HTML output
 
-release: '8.4.0-5'
+release: '8.4.0-6'
 version: '8.4'
 vers: '8.4' # is used in links and to specify a product version
 pkg: 'pxb-84-lts'
-release-date: '2025-12-17'
-title_date: '2025-12-17'
-amzn: '8.4.0-5.1.amzn2023'
+release-date: '2026-05-'
+title_date: '2026-05-'
+amzn: '8.4.0-6.1.amzn2023'