en, zh: add release notes for v1.2.0

en/TOC.md

@@ -103,6 +103,7 @@
 + [TiDB Operator Roadmap](roadmap.md)
 + Release Notes
   + v1.2
+    - [1.2.0](releases/release-1.2.0.md)
     - [1.2.0-rc.2](releases/release-1.2.0-rc.2.md)
     - [1.2.0-rc.1](releases/release-1.2.0-rc.1.md)
     - [1.2.0-beta.2](releases/release-1.2.0-beta.2.md)

en/releases/release-1.2.0.md

@@ -0,0 +1,26 @@
+---
+title: TiDB Operator 1.2.0 Release Notes
+---
+
+# TiDB Operator 1.2.0 Release Notes
+
+Release date: July 29, 2021
+
+TiDB Operator version: 1.2.0
+
+## Rolling Update Changes
+
+- Upgrading TiDB Operator will cause the recreation of the TidbMonitor Pod due to [#4085](https://github.com/pingcap/tidb-operator/pull/4085)
+
+## New features
+
+- Support setting `retentionTime` for Prometheus with more fine-grained duration than `reserveDays`, and will only use `retentionTime` if both configured ([#4085](https://github.com/pingcap/tidb-operator/pull/4085), [@better0332](https://github.com/better0332))
+- Support setting `priorityClassName` of `Backup` Job ([#4078](https://github.com/pingcap/tidb-operator/pull/4078), [@mikechengwei](https://github.com/mikechengwei))
+
+## Improvements
+
+- Set the default region leader eviction timeout of TiKV to 1500 min ([#4071](https://github.com/pingcap/tidb-operator/pull/4071), [@KanShiori](https://github.com/KanShiori))
+
+## Bug fixes
+
+- Fix the issue that may parse URL of `Prometheus.RemoteWrite` in `TiDBMonitor` failed ([#4087](https://github.com/pingcap/tidb-operator/pull/4087), [@better0332](https://github.com/better0332))

zh/TOC.md

@@ -105,6 +105,7 @@
 + [TiDB Operator Roadmap](roadmap.md)
 + 版本发布历史
   + v1.2
+    - [1.2.0](releases/release-1.2.0.md)
     - [1.2.0-rc.2](releases/release-1.2.0-rc.2.md)
     - [1.2.0-rc.1](releases/release-1.2.0-rc.1.md)
     - [1.2.0-beta.2](releases/release-1.2.0-beta.2.md)

zh/releases/release-1.2.0.md

@@ -0,0 +1,26 @@
+---
+title: TiDB Operator 1.2.0 Release Notes
+---
+
+# TiDB Operator 1.2.0 Release Notes
+
+发布日期：2021 年 7 月 29 日
+
+TiDB Operator 版本：1.2.0
+
+## 滚动升级改动
+
+- 由于 [#4085](https://github.com/pingcap/tidb-operator/pull/4085) 的改动，升级 TiDB Operator 会导致 TidbMonitor Pod 删除重建
+
+## 新功能
+
+- 支持为 `TiDBMonitor` 的 `Prometheus` 设置比 `reserveDays` 更细粒度的 `retentionTime`，两者都配置的情况下仅使用 `retentionTime` ([#4085](https://github.com/pingcap/tidb-operator/pull/4085), [@better0332](https://github.com/better0332))
+- 支持设置 `Backup` Job 的 `priorityClassName` ([#4078](https://github.com/pingcap/tidb-operator/pull/4078), [@mikechengwei](https://github.com/mikechengwei))
+
+## 优化提升
+
+- 将 TiKV 的 Region Leader 驱逐超时时间默认值调整为 1500 分钟 ([#4071](https://github.com/pingcap/tidb-operator/pull/4071), [@KanShiori](https://github.com/KanShiori))
+
+## Bug 修复
+
+- 修复可能解析 `TiDBMonitor` 定义中 `Prometheus.RemoteWrite` 的 URL 失败的问题 ([#4087](https://github.com/pingcap/tidb-operator/pull/4087), [@better0332](https://github.com/better0332))