docs: add taosKeeper document (#16384)

docs/en/14-reference/14-taosKeeper.md

 ---
 sidebar_label: taosKeeper
 title: taosKeeper
-description: Instructions and tips for using taosKeeper
+description: exports TDengine monitoring metrics.
 ---
 
 ## Introduction
@@ -22,26 +22,35 @@ You can compile taosKeeper separately and install it. Please refer to the [taosK
 
 ### Configuration and running methods
 
-<!-- taosKeeper needs to be executed on the terminal of the operating system, it supports two configuration methods: [Command-line arguments](#command-line-arguments-in-detail) and [configuration file](#configuration-file-parameters-in-detail). Command-line arguments take precedence over values in the configuration file. -->
-taosKeeper needs to be executed on the terminal of the operating system. To run taosKeeper, see [configuration file](#configuration-file-parameters-in-detail).
+taosKeeper needs to be executed on the terminal of the operating system, it supports three configuration methods: [Command-line arguments](#command-line-arguments-in-detail), [environment variable](#environment-variable-in-detail) and [configuration file](#configuration-file-parameters-in-detail). The precedence of those is Command-line, environment variable and configuration file.
 
 **Make sure that the TDengine cluster is running correctly before running taosKeeper. ** Ensure that the monitoring service in TDengine has been started. For more information, see [TDengine Monitoring Configuration](../config/#monitoring).
 
-<!--
 ### Command-Line Parameters
 
-You can use command-line parameters to run taosBenchmark and control its behavior:
+You can use command-line parameters to run taosKeeper and control its behavior:
 
 ```shell
-taosKeeper
+$ taosKeeper
 ```
--->
+### Environment variable
+
+You can use Environment variable to run taosKeeper and control its behavior:
+
+```shell
+$ export TAOS_KEEPER_TDENGINE_HOST=192.168.64.3
+ 
+$ taoskeeper
+```
+
+you can run `taoskeeper -h` for more detail.
+
 ### Configuration File
 
 You can quickly launch taosKeeper with the following commands. If you do not specify a configuration file, `/etc/taos/keeper.toml` is used by default. If this file does not specify configurations, the default values are used. 
 
 ```shell
-taoskeeper -c <keeper config file>
+$ taoskeeper -c <keeper config file>
 ```
 
 **Sample configuration files**
@@ -110,7 +119,7 @@ Query OK, 1 rows in database (0.036162s)
 #### Export Monitoring Metrics
 
 ```shell
-curl http://127.0.0.1:6043/metrics
+$ curl http://127.0.0.1:6043/metrics
 ```
 
 Sample result set (excerpt):

docs/zh/14-reference/14-taosKeeper.md

 ---
 sidebar_label: taosKeeper
 title: taosKeeper
-description: TDengine taosKeeper 使用说明
+description: TDengine 3.0 版本监控指标的导出工具
 ---
 
 ## 简介
@@ -22,26 +22,36 @@ taosKeeper 安装方式：
 
 ### 配置和运行方式
 
-<!-- taosKeeper 需要在操作系统终端执行，该工具支持两种配置方式：[命令行参数](#命令行参数启动) 和 [配置文件](#配置文件启动)。命令行参数优先级高于配置文件参数。-->
-taosKeeper 需要在操作系统终端执行，该工具支持 [配置文件启动](#配置文件启动)。
+taosKeeper 需要在操作系统终端执行，该工具支持三种配置方式：[命令行参数](#命令行参数启动)、[环境变量](#环境变量启动) 和 [配置文件](#配置文件启动)。优先级为：命令行参数、环境变量、配置文件参数。
 
 **在运行 taosKeeper 之前要确保 TDengine 集群与 taosAdapter 已经在正确运行。** 并且 TDengine 已经开启监控服务，具体请参考：[TDengine 监控配置](../config/#监控相关)。
 
-<!--
 ### 命令行参数启动
 
-在使用命令行参数运行 taosBenchmark 并控制其行为。
+在使用命令行参数运行 taosKeeper 并控制其行为。
 
 ```shell
-taosKeeper
+$ taosKeeper
 ```
--->
+
+### 环境变量启动
+
+通过设置环境变量达到控制启动参数的目的，通常在容器中运行时使用。
+
+```shell
+$ export TAOS_KEEPER_TDENGINE_HOST=192.168.64.3
+ 
+$ taoskeeper
+```
+
+具体参数列表请参照 `taoskeeper -h` 输入结果。
+
 ### 配置文件启动
 
 执行以下命令即可快速体验 taosKeeper。当不指定 taosKeeper 配置文件时，优先使用 `/etc/taos/keeper.toml` 配置，否则将使用默认配置。 
 
 ```shell
-taoskeeper -c <keeper config file>
+$ taoskeeper -c <keeper config file>
 ```
 
 **下面是配置文件的示例：**
@@ -110,7 +120,7 @@ Query OK, 1 rows in database (0.036162s)
 #### 导出监控指标
 
 ```shell
-curl http://127.0.0.1:6043/metrics
+$ curl http://127.0.0.1:6043/metrics
 ```
 
 部分结果集：