releases: add TiDB 4.0.6 release notes

TOC.md

@@ -514,6 +514,7 @@
 + 版本发布历史
   + [发布版本汇总](/releases/release-notes.md)
   + v4.0
+    - [4.0.6](/releases/release-4.0.6.md)
     - [4.0.5](/releases/release-4.0.5.md)
     - [4.0.4](/releases/release-4.0.4.md)
     - [4.0.3](/releases/release-4.0.3.md)

releases/release-4.0.6.md

@@ -0,0 +1,101 @@
+---
+title: TiDB 4.0.6 Release Notes
+---
+
+# TiDB 4.0.6 Release Notes
+
+发版日期：2020 年 9 月 15 日
+
+TiDB 版本：4.0.6
+
+## 兼容性变化
+
++ TiDB
+
+    - 
+
+## 新功能
+
++ TiDB
+
+    - 
+
++ PD
+    - 添加更多关于 store 和 region 心跳的 metrics [#2891](https://github.com/tikv/pd/pull/2891)
+    - 升级 Dashboard 到 v2020.09.08.1 [#2928](https://github.com/pingcap/pd/pull/2928)
+    - 回滚低空间报警的阈值策略 [#2875](https://github.com/pingcap/pd/pull/2875)
+    - 支持标准错误码 [#2918](https://github.com/tikv/pd/pull/2918) [#2911](https://github.com/tikv/pd/pull/2911) [#2913](https://github.com/tikv/pd/pull/2913) [#2915](https://github.com/tikv/pd/pull/2915) [#2912](https://github.com/tikv/pd/pull/2912) [#2907](https://github.com/tikv/pd/pull/2907) [#2906](https://github.com/tikv/pd/pull/2906) [#2903](https://github.com/tikv/pd/pull/2903) [#2806](https://github.com/tikv/pd/pull/2806) [#2900](https://github.com/tikv/pd/pull/2900) [#2902](https://github.com/tikv/pd/pull/2902)
+
+## 优化提升
+
++ TiDB
+
+    - 
+
++ PD
+
+    - 
+
++ TiKV
+
+    - 
+
++ TiFlash
+
+    - 
+
++ Tools
+
+    + TiCDC
+
+        - 
+
+    + Backup & Restore (BR)
+
+        - 
+
+    + Dumpling
+
+        - 
+
+    + TiDB Lightning
+
+        - 
+
+## Bug 修复
+
++ TiDB
+
+    - 
+
++ PD
+    - 添加 `initial-cluster-token` 配置避免启动时 cluster 之间的通信 [#2922](https://github.com/pingcap/pd/pull/2922)
+    - 修正自动模式下 store limit 的单位 [#2826](https://github.com/pingcap/pd/pull/2826)
+    - 添加对于 scheduler 持久化时引发的错误的处理 [#2818](https://github.com/tikv/pd/pull/2818)
+    - 修复 scheduler 的 http 接口的返回结果可能为空的问题 [#2871](https://github.com/tikv/pd/pull/2871) [#2874](https://github.com/tikv/pd/pull/2874)
+
++ TiKV
+
+    - 
+
++ TiFlash
+
+    - 
+
++ Tools
+
+    + Backup & Restore (BR)
+
+        - 
+
+    + Dumpling
+
+        - 
+
+    + TiCDC
+
+        - 
+
+    + TiDB Lightning
+
+        - 

releases/release-notes.md

@@ -9,6 +9,7 @@ TiDB 历史版本发布声明如下：
 
 ## 4.0
 
+- [4.0.6](/releases/release-4.0.6.md)
 - [4.0.5](/releases/release-4.0.5.md)
 - [4.0.4](/releases/release-4.0.4.md)
 - [4.0.3](/releases/release-4.0.3.md)