[Docs] 3.8.1 release

documentation/docs/release-notes/3.8.1.md

@@ -0,0 +1,57 @@
+# Percona Monitoring and Management 3.8.1
+
+**Release date**: June 10th, 2026
+
+Percona Monitoring and Management (PMM) is an open source database monitoring, management, and observability solution for MySQL, PostgreSQL, MongoDB, Valkey and Redis. PMM empowers you to:
+
+- monitor the health and performance of your database systems
+- identify patterns and trends in database behavior
+- diagnose and resolve issues faster with actionable insights
+- manage databases across on-premises, cloud, and hybrid environments
+
+## 📋 Release summary
+
+
+## 🔒 Security updates
+
+### Dependency security updates
+
+Updated PMM Client and Server dependencies to address multiple security vulnerabilities, including a critical gRPC authorization bypass (CVE-2026-33186) and high severity fixes for Docker, Go JOSE, go-getter, and OpenTelemetry components.
+
+
+### Grafana upgraded to 12.4.3+security-02 to address CVEs
+
+PMM 3.8.1 upgrades Grafana to 12.4.3+security-02 to address 10 security vulnerabilities. We recommend upgrading to PMM 3.8.1 as soon as possible.
+For the full list of CVEs addressed through this upgrade, see the [Grafana 12.4.3+security-02 release notes](https://github.com/grafana/grafana/releases/tag/v12.4.3%2Bsecurity-02).
+
+
+### nginx CVE-2026-1642
+
+PMM 3.8.1 ships with the bundled nginx where the CVE-2026-1642 vulnerability is fixed. We recommend upgrading to PMM 3.8.1 as soon as possible if you are using the bundled nginx. For more information about this vulnerability, see [CVE-2026-1642](https://nvd.nist.gov/vuln/detail/CVE-2026-1642).
+
+
+## 📈 Improvements
+
+
+## ✅ Fixed issues
+
+- [PMM-15054](https://perconadev.atlassian.net/browse/PMM-15054): Fixed an issue where ClickHouse system log tables grew out of control,consuming all available memory and causing PMM Server to fail with `MEMORY_LIMIT_EXCEEDED` errors. PMM now disables the log tables it doesn't use and cleans up leftover tables from previous upgrades. 
+
+- [PMM-14858](https://perconadev.atlassian.net/browse/PMM-14858): Fixed an issue where PMM logged repeated connection errors when configured to use an external ClickHouse instance instead of the built-in one. 
+
+- [PMM-14763](https://perconadev.atlassian.net/browse/PMM-14763): Fixed an issue where OS metrics for AWS RDS instances continued to show data from the old primary after a blue-green switchover, instead of switching to the new primary.
+
+- [PMM-15075](https://perconadev.atlassian.net/browse/PMM-15075): Fixed an issue where the ClickHouse **Read Backoff** panel on the **PMM Health** dashboard displayed an error instead of the graph. Also standardized font sizes across all panels on the dashboard.
+
+- [PMM-15051](https://perconadev.atlassian.net/browse/PMM-15051): Fixed an issue where updating the public address in **Settings > Advanced Settings** returned a server error. 
+
+- [PMM-14894](https://perconadev.atlassian.net/browse/PMM-14894): Fixed the **Cluster Messages** graph in the **Valkey/Redis Cluster Details** dashboard to show the number of cluster messages per second instead of a cumulative total. The graph legend is also restored.
+
+- [PMM-15112](https://perconadev.atlassian.net/browse/PMM-15112): Fixed an issue where a leftover live reload script in Grafana caused an unexpected browser prompt for some users.
+
+
+## 🚀 Ready to upgrade to PMM 3.8.1?
+https://perconadev.atlassian.net/browse/PMM-
+- [New installation](../quickstart/quickstart.md)
+- [Upgrading from PMM 3](../pmm-upgrade/index.md)
+- [Upgrading from PMM 2](../pmm-upgrade/migrating_from_pmm_2.md)