update: add beta 3 release notes

Author: peterbarnett03

content/shared/v3-core-enterprise-release-notes/_index.md

@@ -5,6 +5,28 @@
 > All updates to Core are automatically included in Enterprise.
 > The Enterprise sections below only list features exclusive to Enterprise.
 
+## v3.0.0-0.beta.3 {date="2025-04-01"}
+**Core**: revision f881c5844bec93a85242f26357a1ef3ebf419dd3\
+**Enterprise**: revision 6bef9e700a59c0973b0cefdc6baf11583933e262
+### Core
+#### Features
+##### General Improvements
+- InfluxDB 3 now supports graceful shutdowns when sending the interrupt signal to the service.
+
+##### Bug fixes
+- Empty batches in JSON format results are now handled properly
+- The Processing Engine now properly extracts data from DictionaryArrays
+
+### Enterprise
+#### Features
+##### Multi-Node Improvements
+- Query nodes now automatically detect new ingest nodes
+
+##### Bug fixes
+- Several fixes to how compaction planning and processing works 
+- The Processing Engine now properly extracts data from DictionaryArrays
+
+
 ## v3.0.0-0.beta.2 {date="2025-03-24"}
 **Core**: revision 033e1176d8c322b763b4aefb24686121b1b24f7c\
 **Enterprise**: revision e530fcd498c593cffec2b56d4f5194afc717d898