docs: Add device diagnosis documentation, including communication health monitoring, statistical indicators, failure tracking, and a new image.

Author: zjhong

docs/introduction/functions.md

@@ -116,6 +116,9 @@ Includes: Dashboard Overview, Device Connectivity, Visualization, Automation, Al
    - **Settings**: Change Device Template.
      - Manually adjust online status.
      - View firmware info.
+   - **Diagnosis**: Visualized device communication health monitoring.
+     - Statistical Indicators (Uplink/Downlink/Storage success rates).
+     - Failure Record Tracking.
 
 5. **Device Groups**:
    - One device can belong to multiple groups.

docs/user-guide/tenant-operation-manual/device-mgt/device_management.md

@@ -88,3 +88,12 @@ sidebar_position: 1
 - Set device template, group, online/offline status, etc.
 
 ![Settings](./images/image51.png)
+
+### 2.11 Diagnosis
+
+- Device Connection Diagnosis provides visualized device communication health monitoring, allowing developers to know device status in real-time.
+
+- **Statistical Indicators**: Sustained monitoring of success rates for Uplink, Downlink, and Storage.
+- **Failure Record Tracking**: Automatically saves recent failure records including Time, Direction, Stage, and Error Description.
+
+![Device Diagnosis](/img/devices/diagnosis/diagnosis_panel.png)

i18n/zh-Hans/docusaurus-plugin-content-docs/current/introduction/functions.md

@@ -123,6 +123,9 @@ sidebar_position: 3
    - **设置**：支持修改设备模板
      - 可手动调整设备在线状态
      - 支持查看设备固件信息
+   - **诊断**：可视化设备通信健康监控
+     - 统计指标监控（上行、下行、存储成功率）
+     - 失败记录追踪
 
 5. **设备分组**：
    - 一个设备可属于多个分组

i18n/zh-Hans/docusaurus-plugin-content-docs/current/user-guide/tenant-operation-manual/device-mgt/device_management.md

@@ -89,4 +89,13 @@ sidebar_position: 1
 
 ![descript](./images/image51.png)
 
+### 2.11、诊断
+
+- 设备连接诊断功能提供可视化的设备通信健康监控，让开发者可以实时掌握设备状态。
+
+- **统计指标监控**：持续统计设备通信全过程的成功率（上行、下行、存储）。
+- **失败记录追踪**：自动保存最近的失败记录，包含时间、方向、阶段和错误描述。
+
+![诊断面板](/img/devices/diagnosis/diagnosis_panel.png)
+