PG-2503 - Add PSP 18.4.2 release notes

docs/release-notes/release-notes-v18.4.2.md

@@ -0,0 +1,49 @@
+# Percona Distribution for PostgreSQL 18.4.2 ({{date.18_4_2}})
+
+--8<-- "release-notes-intro.md"
+
+This release of Percona Distribution for PostgreSQL is based on Percona Server for PostgreSQL 18.4.2 - a binary-compatible, open source drop-in replacement of [PostgreSQL Community 18.4](https://www.postgresql.org/docs/18/release-18-4.html).
+
+## Release Highlights
+
+Percona Distribution for PostgreSQL 18.4.2 is an out-of-cycle maintenance release that addresses an issue where TimescaleDB and Citus were not compilable with earlier Percona Server for PostgreSQL versions, and fixes high-severity CVEs for which fixes were available.
+
+This release also updates bundled components, including `pg_tde` 2.2.1, and refreshes Docker images with fixes for high-severity CVEs where available.
+
+!!! warning
+    Percona Server for PostgreSQL 18.4.2 and `pg_tde` 2.2.1 are only supported together. Combining either with an earlier version of the other is not supported.
+
+To upgrade from an earlier version of Percona Distribution for PostgreSQL, follow the steps in [Upgrading Percona Distribution for PostgreSQL](../major-upgrade.md).
+
+### Docker image updates
+
+Docker images have been rebuilt to address high-severity CVEs where fixes were available.
+
+## Known Issues
+
+### For minor & major upgrades (RHEL only)
+
+During an upgrade on RHEL, you may encounter the following error:
+
+```bash
+Unknown Error occurred: Transaction test error:
+  file /usr/share/postgresql-common/server/postgresql.mk from install of percona-postgresql-common conflicts with file from package percona-postgresql-common-dev
+  file /usr/share/postgresql-common/t/040_upgrade.t from install of percona-postgresql-common conflicts with file from package percona-postgresql-common-dev
+```
+
+To resolve this, remove the `percona-postgresql-common-dev` package and reinstall it with the new intended upgraded PPG/PSP server.
+
+## Component updates
+
+The following bundled components have been updated in this release:
+
+| Component | Version |
+|-----------|---------|
+| pg_tde | 2.2.1 |
+| PostGIS | 3.5.7 |
+| pgVector | 0.8.3 |
+| pgpool | 4.7.2 |
+
+For Red Hat Enterprise Linux 8 and compatible derivatives, Percona Distribution for PostgreSQL also includes the supplemental `python3-etcd` 0.4.5 packages, which are used for setting up Patroni clusters.
+
+Percona Distribution for PostgreSQL is also shipped with the [libpq](https://www.postgresql.org/docs/18/libpq.html) library. It contains a set of library functions that allow client programs to pass queries to the PostgreSQL backend server and to receive the results of these queries.

docs/release-notes/release-notes.md

@@ -4,6 +4,7 @@ This page lists all release notes for Percona Server for PostgreSQL 18, organize
 
 ## 2026
 
+* [18.4.2](release-notes-v18.4.2.md) ({{date.18_4_2}})
 * [18.4.1](release-notes-v18.4.1.md) ({{date.18_4_1}})
 * [18.3.1](release-notes-v18.3.1.md) ({{date.18_3_1}})
 

docs/templates/pdf_cover_page.tpl

@@ -7,6 +7,6 @@
 {% if config.site_description %}
 <h1>{{ config.site_description }}</h1>
 {% endif %} 
-<h2>18.4.1 (May 20, 2026)</h2>
+<h2>18.4.2 (July 30, 2026)</h2>
 <!--<h3>Percona Technical Documentation Team</h3>-->
 

mkdocs.yml

@@ -79,10 +79,11 @@ nav:
   - Uninstall: uninstalling.md
   - Release notes:
       - "Release notes index": release-notes/release-notes.md
-      - "18.4.1": release-notes/release-notes-v18.4.1.md
-      - "18.3.1": release-notes/release-notes-v18.3.1.md
+      - "18.4.2 ({{date.18_4_2}})": release-notes/release-notes-v18.4.2.md
+      - "18.4.1 ({{date.18_4_1}})": release-notes/release-notes-v18.4.1.md
+      - "18.3.1 ({{date.18_3_1}})": release-notes/release-notes-v18.3.1.md
       - "2025":
-        - "18.1.1": release-notes/release-notes-v18.1.1.md
+        - "18.1.1 ({{date.18_1_1}})": release-notes/release-notes-v18.1.1.md
   - Reference:
       - Licensing: licensing.md
       - Versioning: versioning.md

variables.yml

@@ -1,17 +1,18 @@
 # PG Variables set for HTML output
 # See also mkdocs.yml plugins.with-pdf.cover_subtitle and output_path
 
-release: 'release-notes-v18.4.1'
+release: 'release-notes-v18.4.2'
 dockertag: '18.4'
 pgsubversion: '18.4'
 pgversion: '18'
-pspgversion: '18.4.1' 
+pspgversion: '18.4.2' 
 pgsmversion: '2.3.2'
 pgbouncerversion: '1.25.2'
 pgbackrestversion: '2.58.0'
 
 
 date:
+  18_4_2: 2026-07-30
   18_4_1: 2026-05-20
   18_3_1: 2026-03-02
   18_1_1: 2025-11-28