[Docs] Remove doc references to Focal Fossa (PMM-14057)

documentation/docs/install-pmm/install-pmm-client/connect-database/linux.md

@@ -1,14 +1,13 @@
 # Connect Linux databases to PMM
 
-
-## Supported Linux Distributions
+## Supported Linux distributions
 
 PMM Client supports collecting system metrics from various Linux distributions:
 
 - Red Hat/CentOS/Oracle Linux 8 and 9
 - Amazon Linux 2023 (native support added in PMM 3.2.0)
 - Debian 11 (Bullseye) and 12 (Bookworm)
-- Ubuntu 20.04 (Focal), 22.04 (Jammy), and 24.04 (Noble)
+- Ubuntu 22.04 (Jammy) and 24.04 (Noble)
 
 ## Add Linux monitoring
 

documentation/docs/install-pmm/install-pmm-client/package_manager.md

@@ -8,7 +8,7 @@ PMM Client supports:
 - **Operating systems**:
     - Red Hat/CentOS/Oracle Linux 8 and 9
     - Debian 11 (Bullseye) and 12 (Bookworm)
-    - Ubuntu 20.04 (Focal), 22.04 (Jammy), and 24.04 (Noble)
+    - Ubuntu 22.04 (Jammy) and 24.04 (Noble)
     - Amazon Linux 2023
 
 The package manager will automatically select the appropriate version for your system architecture.

documentation/docs/install-pmm/plan-pmm-installation/hardware_and_system.md

@@ -52,7 +52,6 @@ To reduce storage usage, consider [disable table statistics](../install-pmm-clie
 - **CPU**: must support the [`SSE4.2`](https://wikipedia.org/wiki/SSE4#SSE4.2), which is required for Query Analytics (QAN).
 - **ARM64**: ensure your system uses a supported ARM64 architecture (such as ARMv8 or later). PMM Server is not currently available as a native ARM64 build. For ARM-based systems, use Docker or Podman to run x86_64 images via emulation. To explicitly force Docker to use the x86_64 image on an ARM system, use: `docker run --platform linux/amd64 ... <your_pmm_server_image>`. 
 
-
 ### PMM Client 
 
 - **Installation storage**: Requires 100 MB of storage for installation

documentation/docs/pmm-upgrade/upgrade_client.md

@@ -47,9 +47,9 @@ To deploy a specific version of the PMM Client via package manager, check the av
 === "Debian-based"
     ```sh
     apt-cache madison pmm-client
-    pmm-client | 3.0.1-6.focal | http://repo.percona.com/pmm-client/apt focal/main amd64 Packages
-    pmm-client | 3.0.0-6.focal | http://repo.percona.com/pmm-client/apt focal/main amd64 Packages
-    apt install pmm-client=3.0.1-6.focal
+    pmm-client | 3.0.1-6.jammy | http://repo.percona.com/pmm-client/apt jammy/main amd64 Packages
+    pmm-client | 3.0.0-6.jammy | http://repo.percona.com/pmm-client/apt jammy/main amd64 Packages
+    apt install pmm-client=3.0.1-6.jammy
     ```
 
 ### 2. Tarball method

documentation/docs/release-notes/3.3.0.md

@@ -16,12 +16,25 @@ Percona Monitoring and Management (PMM) is an open source database monitoring, m
 
 ## Release highlights
 
+
+## Platform support changes and deprecations
+
+### Removed support for Ubuntu 20.04 LTS (Focal Fossa) 
+
+Ubuntu 20.04 LTS (Focal Fossa) reached its End of Life on May 31, 2025. Consequently, we no longer build PMM Client packages for this platform. 
+
+If your PMM Client is running on Ubuntu 20.04, upgrade your operating system to Ubuntu 22.04 LTS or a later version, and then reinstall PMM Client using the package version for your new Ubuntu release. 
+
+Existing installations on Ubuntu 20.04 will continue to work but we will not release further updates. Source packages (.sdeb) are now built on Ubuntu 22.04 instead of Ubuntu 20.04. 
+
 ## Improvements
 
 - [PMM-13970](https://perconadev.atlassian.net/browse/PMM-13970) - Added `--tls-skip-verify` flag for `pmm-admin add external`, `pmm-admin add external-serverless`, and `pmm-admin add haproxy` commands. This flag skips TLS certificate validation, enabling you to monitor services with self-signed certificates or IP-based endpoints that lack proper certificate SANs, including PostgreSQL Operator deployments with HAProxy.
 
 
 
+
+
 ## Fixed issues