2.40.0_RN_update (#1166)

* 2.40.0_RN_update

* Update 2.40.0.md

* Update 2.40.0.md

* Update 2.40.0.md

* Update 2.37.1.md

* 2.40 update

* Update 2.40.0.md

* Update 2.40.0.md

* Update 2.40.0.md

docs/release-notes/2.40.0.md

@@ -8,15 +8,10 @@
 
 Percona Monitoring and Management (PMM) is an open source database monitoring, management, and observability solution for MySQL, PostgreSQL, and MongoDB.
 
-<!---
 
-!!! caution alert alert-warning "Important/Caution"
-    Crucial points that need emphasis:
+!!! caution alert alert-warning "Caution"
+    **If you are using the Library Panels on the PMM dashboard, avoid upgrading to PMM 2.40.0 due to a known issue. Instead, we recommend waiting for the release of PMM 2.40.1.**
 
-    - Important: A significant point that deserves emphasis.
-    - Caution: Used to mean 'Continue with care'.
-
---->
 
 ## Release Highlights
 
@@ -110,6 +105,8 @@ VictoriaMetrics has been upgraded [v1.93.4](https://docs.victoriametrics.com/CHA
 - [PMM-12146](https://jira.percona.com/browse/PMM-12146) - Dead Tuples graph on PostgreSQL Vacuum Monitoring Dashboard displayed invalid percentage. The issue has been resolved now.
 - [PMM-12448](https://jira.percona.com/browse/PMM-12448) - Can't start backup if artifact with empty `service_id` exists.
 
-## Known issue
+## Known issues
 
 - [PMM-12517](https://jira.percona.com/browse/PMM-12517) - If you have set custom dashboards as your Home dashboard in version 2.26.0, they may be lost after upgrading to version 2.40.0. To prevent this, we recommend that you back up your custom dashboard before upgrading and recover it after the upgrade.
+
+- [PMM-12592](https://jira.percona.com/browse/PMM-12592) - If you are using the **Library Panels** on the PMM dashboard, avoid upgrading to PMM 2.40.0 due to a known issue.