tidb cloud: add release notes for 20231107 (#15271)

tidb-cloud/tidb-cloud-release-notes.md

@@ -8,6 +8,19 @@ aliases: ['/tidbcloud/supported-tidb-versions','/tidbcloud/release-notes']
 
 This page lists the release notes of [TiDB Cloud](https://www.pingcap.com/tidb-cloud/) in 2023.
 
+## November 7, 2023
+
+**General changes**
+
+- Add the following resource usage alerts. The new alerts are disabled by default. You can enable them as needed.
+
+    - Max memory utilization across TiDB nodes exceeded 70% for 10 minutes
+    - Max memory utilization across TiKV nodes exceeded 70% for 10 minutes
+    - Max CPU utilization across TiDB nodes exceeded 80% for 10 minutes
+    - Max CPU utilization across TiKV nodes exceeded 80% for 10 minutes
+
+  For more information, see [TiDB Cloud Built-in Alerting](/tidb-cloud/monitor-built-in-alerting.md#resource-usage-alerts).
+
 ## October 31, 2023
 
 **General changes**