Add release notes for 5.9.0

Author: Meggielqk

dir.yaml

@@ -752,11 +752,7 @@
       title_cn: MQTT 原因码
       path: https://www.emqx.com/en/blog/mqtt5-new-features-reason-code-and-ack
 
--  title_en: Release Notes
-   title_cn: 版本发布历史
-   collapsed: true
-   children:
-       - title_en: EMQX Enterprise Release Notes
+- title_en: EMQX Enterprise Release Notes
          title_cn: EMQX 企业版版本发布历史
          collapsed: true
          path: changes/all-changes-ee
@@ -789,31 +785,4 @@
              - title_en: End of Life Dates
                title_cn: 产品生命周期结束日期
                path: changes/eol-ee
-       - title_en: EMQX Open Source Release Notes
-         title_cn: EMQX 开源版版本发布历史
-         collapsed: true
-         path: changes/all-changes-ce
-         children:
-             - changes/changes-ce-v5
-             - changes/changes-ce-v4
-             - title_en: Version 0.1 to 3.x
-               title_cn: v0.1-v3.x 版本
-               path: changes/changes-ce-v3
-             - title_en: Incompatible Changes
-               title_cn: 不兼容变更
-               collapsed: true
-               children:
-                   - changes/breaking-changes-ce-5.8
-                   - changes/breaking-changes-ce-5.7
-                   - changes/breaking-changes-ce-5.6
-                   - changes/breaking-changes-ce-5.5
-                   - changes/breaking-changes-ce-5.4
-                   - title_en: Incompatible Changes between EMQX 4.4 and EMQX 5.1
-                     title_cn: 从 EMQX 4.4 到 EMQX 5.1 的不兼容变更
-                     path: changes/breaking-changes-5.1.0
-                     collapsed: true
-                     children:
-                         - changes/auth-4.4-to-5.1-compatibility
-                         - changes/data-integration-4.4-to-5.1-incompatibility
-                         - changes/gateway-4.4-to-5.1-incompatibility
 

en_US/changes/all-changes-ee.md

@@ -2,6 +2,10 @@
 
 The release notes page for EMQX Enterprise provides a comprehensive and detailed record of updates, enhancements, and fixes included in each version of EMQX Enterprise.
 
+## v5.9
+
+- [5.9.0](./changes-ee-v5.md#_5-9-0): 2025-04-22
+
 ## v5.8
 
 - [5.8.6](./changes-ee-v5.md#_5-8-6): 2025-03-25

en_US/changes/breaking-changes-ee-5.9.md

@@ -0,0 +1,9 @@
+# Incompatible Changes in EMQX 5.9
+
+## 5.9.0
+
+- [#14773](https://github.com/emqx/emqx/pull/14773) Rate limiting configuration options have been changed.
+  - This change is incompatible with versions prior to 5.1.0
+  - This change is also incompatible with manually modified limiter configurations that use structures from versions prior to 5.1.0
+  - The undocumented endpoint `/configs/limiter` has been removed
+- [#14703](https://github.com/emqx/emqx/pull/14703) Changed the maximum allowed value for `force_shutdown.max_heap_size` to `128GB`.