Boost useful diagnostic queries a little more

Author: jonels-msft

articles/cosmos-db/postgresql/TOC.yml

@@ -156,6 +156,8 @@
         - name: Access database logs
           href: howto-logging.md
           displayName: log, hyperscale
+        - name: Useful diagnostic queries
+          href: howto-useful-diagnostic-queries.md
     - name: Scale
       items:
         - name: Cluster size

articles/cosmos-db/postgresql/concepts-nodes.md

@@ -6,7 +6,7 @@ author: jonels-msft
 ms.service: cosmos-db
 ms.subservice: postgresql
 ms.topic: conceptual
-ms.date: 07/28/2019
+ms.date: 10/26/2022
 ---
 
 # Nodes and tables in Azure Cosmos DB for PostgreSQL
@@ -141,3 +141,4 @@ WHERE shardid = 102027;
 ## Next steps
 
 - [Determine your application's type](howto-app-type.md) to prepare for data modeling
+- Inspect shards and placements with [useful diagnostic queries](howto-useful-diagnostic-queries.md).