RN for change to K8s rec logic: re ConfigMap and Secret

Author: memildin

articles/security-center/release-notes.md

@@ -5,7 +5,7 @@ author: memildin
 manager: rkarlin
 ms.service: security-center
 ms.topic: reference
-ms.date: 10/06/2021
+ms.date: 10/13/2021
 ms.author: memildin
 
 ---
@@ -30,7 +30,7 @@ Updates in October include:
 - [Vulnerability assessment solutions can now be auto enabled (in preview)](#vulnerability-assessment-solutions-can-now-be-auto-enabled-in-preview)
 - [Software inventory filters added to asset inventory (in preview)](#software-inventory-filters-added-to-asset-inventory-in-preview)
 - [Changed prefix of some alert types from "ARM_" to "VM_"](#changed-prefix-of-some-alert-types-from-arm_-to-vm_)
-
+- [Changes to the logic of a security recommendation for Kubernetes clusters](#changes-to-the-logic-of-a-security-recommendation-for-kubernetes-clusters)
 
 ### Microsoft Threat and Vulnerability Management added as vulnerability assessment solution (in preview)
 
@@ -106,6 +106,12 @@ With this update, we've changed the prefixes of these alerts to match this reass
 
 Learn more about the [Azure Defender for Resource Manager](defender-for-resource-manager-introduction.md) and [Azure Defender for servers](defender-for-servers-introduction.md) plans.
 
+### Changes to the logic of a security recommendation for Kubernetes clusters
+
+The recommendation "Kubernetes clusters should not use the default namespace" prevents usage of the default namespace for a range of resource types. Two of the resource types that were included in this recommendation have been removed: ConfigMap and Secret. 
+
+Learn more about this recommendation and hardening your Kubernetes clusters in [Understand Azure Policy for Kubernetes clusters](../governance/policy/concepts/policy-for-kubernetes.md).
+
 ## September 2021
 
 In September, the following update was released: