WI557748 changelog update

Author: ElazarK

articles/defender-for-cloud/defender-sensor-change-log.md

@@ -3,7 +3,7 @@ title: Defender Sensor for Defender for Containers Changelog
 description: Learn about the version history and updates for the Defender sensor in Microsoft Defender for Containers.
 ms.service: defender-for-cloud
 ms.topic: reference
-ms.date: 02/23/2026
+ms.date: 03/02/2026
 ai-usage: ai-assisted
 ---
 
@@ -33,6 +33,42 @@ To see the version of the sensor run:
 
 ### Sensor v0.9 (deployed by Helm or Arc for K8s in Preview mode)
 
+**Sensor v0.9.51 – Preview**
+
+- **Released:** March 2026
+
+- **What's included:**
+
+  - Improvements
+    
+    - Security and platform updates
+        
+      - Upgraded Go and related dependencies and libraries to address security vulnerabilities and improve runtime stability.
+            
+      - Fluent Bit updated to a newer version to improve log processing and security.
+            
+      - FIPS support enabled for the publisher and file-cleaner components for customers requiring FIPS-compliant operation.
+            
+    - Reduced load and resource usage
+        
+      - Reduced aggregation size and narrowed aggregated data types to lower memory and CPU usage.
+            
+      - Chart and publisher updates to reduce query load on the authentication service, improving overall reliability.
+            
+  - Fixes
+    
+    - Authentication stability and concurrency
+        
+      - Token provider now caches negative (false) responses from the auth service to avoid repeated failing calls.
+            
+      - Improved thread-safety in the token provider by adding read-locking around token map checks to prevent race conditions.
+            
+    - Miscellaneous fixes
+        
+      - Various configuration and path fixes to ensure reliable log collection and prevent duplicate data. 
+            
+
+
 **Sensor v0.9.50 – Preview**
 
 - **Released:** February 2026
@@ -77,6 +113,20 @@ To see the version of the sensor run:
 
 ### Sensor v0.8 (relevant to all AKS supported versions and Arc for K8s)
 
+**Sensor v0.8.48 – GA**
+
+- **Released:** March 2026
+
+- **What's included:**
+
+  - Security
+    
+    - Dependency and image updates: Multiple components have updated binaries and container images to address known vulnerabilities.
+        
+    - Go runtime and component upgrades: The Go runtime and an internal IG component were upgraded to remediate security issues.
+        
+    - FIPS and image hardening for publisher components: Publisher and file-cleaner components now support FIPS configurations and use smaller, hardened base images; Fluent Bit was upgraded as part of this hardening.
+
 **Sensor v0.8.47 – GA**
 
 - **Released:** February 2026