Merge pull request #214843 from seesharprun/postgresql-hyperscale-moved-banner

Cosmos DB | Potential Hyperscale/Citus banners

Author: prmerger-automator[bot]

articles/postgresql/single-server/overview.md

@@ -15,6 +15,9 @@ adobe-target: true
 
 [!INCLUDE [applies-to-postgresql-single-server](../includes/applies-to-postgresql-single-server.md)]
 
+> [!IMPORTANT]
+> Azure Database for PostgreSQL - Hyperscale (Citus) is now [Azure Cosmos DB for PostgreSQL](../../cosmos-db/postgresql/introduction.md). To learn more about this change, see [Where is Hyperscale (Citus)?](../hyperscale/moved.md).
+
 Azure Database for PostgreSQL is a relational database service in the Microsoft cloud based on the [PostgreSQL open source relational database](https://www.postgresql.org/). Azure Database for PostgreSQL delivers:
 
 - Built-in high availability.