en,zh: add v1.6.4 release notes

en/TOC.md

@@ -131,6 +131,7 @@
   - [PingCAP Clinic Diagnostic Data](clinic-data-collection.md)
 - Release Notes
   - v1.6
+    - [1.6.4](releases/release-1.6.4.md)
     - [1.6.3](releases/release-1.6.3.md)
     - [1.6.2](releases/release-1.6.2.md)
     - [1.6.1](releases/release-1.6.1.md)

en/releases/release-1.6.4.md

@@ -0,0 +1,14 @@
+---
+title: TiDB Operator 1.6.4 Release Notes
+summary: Learn about new features in TiDB Operator 1.6.2.
+---
+
+# TiDB Operator 1.6.3 Release Notes
+
+Release date: Oct 18, 2025
+
+TiDB Operator version: 1.6.4
+
+## New features
+
+- Add a periodical sync to kernel. If the operator state is inconsistent with the kernel, operator will change the status of logBackup CR, and try to sync with kernel ( eventually make kernel reach the desired state) in the future reconcile. ([#6033](https://github.com/pingcap/tidb-operator/pull/6147), [@RidRisR](https://github.com/RidRisR))

variables.json

@@ -1,4 +1,4 @@
 {
-  "tidb_operator_version": "v1.6.3",
+  "tidb_operator_version": "v1.6.4",
   "tidb_version": "v8.5.2"
 }

zh/TOC.md

@@ -131,6 +131,7 @@
   - [PingCAP Clinic 数据采集范围说明](clinic-data-collection.md)
 - 版本发布历史
   - v1.6
+    - [1.6.4](releases/release-1.6.4.md)
     - [1.6.3](releases/release-1.6.3.md)
     - [1.6.2](releases/release-1.6.2.md)
     - [1.6.1](releases/release-1.6.1.md)

zh/releases/release-1.6.4.md

@@ -0,0 +1,14 @@
+---
+title: TiDB Operator 1.6.3 Release Notes
+summary: 了解 TiDB Operator 1.6.3 版本的新功能。
+---
+
+# TiDB Operator 1.6.3 Release Notes
+
+发布日期：2025 年 10 月 18 日
+
+TiDB Operator 版本：1.6.4
+
+## 新功能
+
+- 增加定期与内核同步的功能。如果 Operator 状态与内核不一致，Operator 会修改 logBackup CR 的状态，并在后续的 Reconcile 中尝试与内核同步（最终使内核达到期望状态）。 ([#6300](https://github.com/pingcap/tidb-operator/pull/6147), [@RidRisR](https://github.com/RidRisR))