docs: add null format and uptime telemetry (#1952)

Co-authored-by: Copilot <[email protected]>

Author: killme2008

docs/reference/telemetry.md

@@ -22,6 +22,21 @@ When telemetry is enabled, GreptimeDB will collect the following information eve
 - Mode in which GreptimeDB is running(standalone, distributed)
 - A randomly generated installation ID
 - The number of datanodes in the GreptimeDB cluster
+- System uptime, not exact figures, only time ranges like `hours`, `weeks` with no numbers
+
+ Sample telemetry data:
+```json
+{
+  "os": "linux",
+  "version": "0.15.1",
+  "arch": "aarch64",
+  "mode": "Standalone",
+  "git_commit": "00d759e828f5e148ec18141904e20cb1cb7577b0",
+  "nodes": 1,
+  "uuid": "43717682-baa8-41e0-b126-67b797b66606",
+  "uptime": "hours"
+}
+```
 
 ## How to disable telemetry?
 

docs/user-guide/protocols/http.md

@@ -176,6 +176,7 @@ http://{{API-host}}/v1/sql
     parameters:
     - `compression`: `zstd` or `lz4`, default: no compression
   - `table`: ASCII table format for console output
+  - `null`: Concise text-only output of the row count and elapsed time, useful for evaluating query performance.
 
 ### Body
 

i18n/zh/docusaurus-plugin-content-docs/current/reference/telemetry.md

@@ -22,6 +22,21 @@ description: 介绍 GreptimeDB 的指标收集功能，包括收集的数据类
 - GreptimeDB 运行模式（独立、分布式）
 - 随机生成的安装 ID
 - GreptimeDB 集群中的 datanode 数量
+- 系统运行时间，非精确数字，仅为 `hours`、`weeks` 等时间范围，并且不带数字
+
+数据示例：
+```json
+{
+  "os": "linux",
+  "version": "0.15.1",
+  "arch": "aarch64",
+  "mode": "Standalone",
+  "git_commit": "00d759e828f5e148ec18141904e20cb1cb7577b0",
+  "nodes": 1,
+  "uuid": "43717682-baa8-41e0-b126-67b797b66606",
+  "uptime": "hours"
+}
+```
 
 ## 如何禁用指标收集
 

i18n/zh/docusaurus-plugin-content-docs/current/user-guide/protocols/http.md

@@ -164,6 +164,7 @@ http://{{API-host}}/v1/sql
     格式](https://arrow.apache.org/docs/python/feather.html)。附加参数：
     - `compression`: `zstd` 或 `lz4`，默认：无压缩
   - `table`: 控制台输出的 ASCII 表格格式
+  - `null`: 简洁的纯文本输出，仅显示行数和执行时间，用于评估查询性能。
 
 ### Body