updated aug release notes

Author: varun-dhawan

articles/postgresql/flexible-server/release-notes.md

@@ -6,7 +6,7 @@ ms.author: varundhawan
 ms.service: azure-database-postgresql
 ms.subservice: flexible-server
 ms.topic: overview
-ms.date: 7/12/2024
+ms.date: 8/5/2024
 #customer intent: As a reader, I want the title and description to meet the required length and include the relevant information about the release notes for Azure DB for PostgreSQL - Flexible Server.
 ---
 
@@ -16,6 +16,9 @@ ms.date: 7/12/2024
 
 This page provides latest news and updates regarding feature additions, engine versions support, extensions, and any other announcements relevant to Azure Database for PostgreSQL flexible server.
 
+## Release: Aug 2024
+* General availability of [Database Size Metrics](./concepts-monitoring.md) for Azure Database for PostgreSQL flexible server.
+
 ## Release: July 2024
 * General availability of [Major Version Upgrade Support for PostgreSQL 16](concepts-major-version-upgrade.md) for Azure Database for PostgreSQL flexible server.
 * General availability of [Pgvector 0.7.0](concepts-extensions.md) extension.