Update what's new

Author: maud-lv

articles/managed-grafana/concept-whats-new.md

@@ -5,12 +5,16 @@ author: maud-lv
 ms.author: malev
 ms.service: managed-grafana
 ms.topic: conceptual
-ms.date: 11/17/2023
+ms.date: 02/22/2024
 
 ---
 
 # What's new in Azure Managed Grafana
 
+## March 2024
+
+* We recommend that users with a workspace on Grafana 9 [upgrade to Grafana 10](how-to-upgrade-grafana-10).
+
 ## October 2023
 
 * Azure Managed Grafana has a new [Essential pricing plan](overview.md#service-tiers) available in preview. This plan provides core Grafana functionalities at a reduced price and is designed to be used in non-production environments.