docs: document SLS/ARMS endpoint overrides and logging examples in README (CN/EN)

- Add CLI/env/@file examples for --sls-endpoints and --arms-endpoints
- Mention template fallback and CMS reusing SLS endpoints
- Show log lines indicating region/endpoint/source

Change-Id: I9a130f23e42c920ec2b34ca638715538dd0a23f2
Co-developed-by: Cursor <[email protected]>

Author: haibin.lhb

README.md

@@ -211,3 +211,44 @@ python -m mcp_server_aliyun_observability --transport sse --access-key-id <your_
 
 ![image](./images/chatwise_demo.png)
 
+
+### 端点映射与全局配置（SLS/ARMS）
+
+支持在启动时覆盖各区域的服务端点，并在运行时打印实际生效的区域与端点（source=explicit/mapping/template）。
+
+- SLS 端点映射（CLI）
+```
+python -m mcp_server_aliyun_observability \
+  --transport streamable-http --transport-port 8083 \
+  --sls-endpoints "cn-shanghai=cn-hangzhou.log.aliyuncs.com"
+```
+
+- ARMS 端点映射（CLI）
+```
+python -m mcp_server_aliyun_observability --arms-endpoints "cn-shanghai=arms.internal"
+```
+
+- 环境变量方式（优先级低于 CLI）
+```
+SLS_ENDPOINTS="cn-shanghai=cn-hangzhou.log.aliyuncs.com" \
+ARMS_ENDPOINTS="cn-shanghai=arms.internal" \
+python -m mcp_server_aliyun_observability --transport sse
+```
+
+- 从文件加载（@file），文件可为 JSON 对象或纯文本 pairs
+```
+echo '{"cn-shanghai":"cn-hangzhou.log.aliyuncs.com"}' > sls_endpoints.json
+python -m mcp_server_aliyun_observability --sls-endpoints @sls_endpoints.json
+```
+
+- 默认回退模板（未命中映射时）：
+  - SLS: `{region}.log.aliyuncs.com`
+  - ARMS: `arms.{region}.aliyuncs.com`
+
+- CMS 说明：CMS 工具内部使用 SLS 客户端，自动复用 `--sls-endpoints` 的映射，无需单独 cms 配置。
+
+- 日志示例（控制台与文件均会输出）：
+```
+SLS endpoint resolved: region=cn-shanghai, endpoint=cn-hangzhou.log.aliyuncs.com, source=mapping
+ARMS endpoint resolved: region=cn-shanghai, endpoint=arms.cn-shanghai.aliyuncs.com, source=template
+```

README_EN.md

@@ -210,4 +210,46 @@ python -m mcp_server_aliyun_observability --transport sse --access-key-id <your_
 
 ![image](./images/chatwise_inter.png)
 
-![image](./images/chatwise_demo.png) 
+![image](./images/chatwise_demo.png) 
+
+
+### Endpoint Overrides and Global Settings (SLS/ARMS)
+
+You can override service endpoints per region at startup. The server logs the effective region/endpoint and its source (explicit/mapping/template) when a client is created.
+
+- SLS endpoint overrides (CLI)
+```
+python -m mcp_server_aliyun_observability \
+  --transport streamable-http --transport-port 8083 \
+  --sls-endpoints "cn-shanghai=cn-hangzhou.log.aliyuncs.com"
+```
+
+- ARMS endpoint overrides (CLI)
+```
+python -m mcp_server_aliyun_observability --arms-endpoints "cn-shanghai=arms.internal"
+```
+
+- Environment variables (lower precedence than CLI)
+```
+SLS_ENDPOINTS="cn-shanghai=cn-hangzhou.log.aliyuncs.com" \
+ARMS_ENDPOINTS="cn-shanghai=arms.internal" \
+python -m mcp_server_aliyun_observability --transport sse
+```
+
+- Load from file (@file). File can be a JSON object or plain pairs text
+```
+echo '{"cn-shanghai":"cn-hangzhou.log.aliyuncs.com"}' > sls_endpoints.json
+python -m mcp_server_aliyun_observability --sls-endpoints @sls_endpoints.json
+```
+
+- Template fallback when no mapping matched:
+  - SLS: `{region}.log.aliyuncs.com`
+  - ARMS: `arms.{region}.aliyuncs.com`
+
+- CMS note: CMS tools internally reuse the SLS client, so it automatically respects `--sls-endpoints`.
+
+- Example logs (to console and file):
+```
+SLS endpoint resolved: region=cn-shanghai, endpoint=cn-hangzhou.log.aliyuncs.com, source=mapping
+ARMS endpoint resolved: region=cn-shanghai, endpoint=arms.cn-shanghai.aliyuncs.com, source=template
+```