feat: a brief placeholder document for log-query endpoint

Signed-off-by: Ruihang Xia <[email protected]>

docs/user-guide/query-data/log-query.md

@@ -0,0 +1,33 @@
+---
+keywords: [log query, logs, search, experimental, HTTP endpoint]
+description: Documentation for GreptimeDB's experimental log query endpoint, which provides a dedicated HTTP interface for searching and processing log data.
+---
+
+# Log Query (Experimental)
+
+> Warning: The log query endpoint feature is currently experimental and may change in future releases.
+
+GreptimeDB provides a dedicated HTTP endpoint to query log data. This feature allows you to search and processing log entries using a simple query interface. This is an add-on feature to existing GreptimeDB capabilities like SQL queries and Flow computations. You can still use your existing tools and workflows to query log data like before.
+
+## Endpoint
+
+```http
+POST /v1/logs
+```
+
+## Headers
+- [Authorization](/user-guide/protocols/http/#authentication)
+- `Content-Type`: `application/json`
+
+## Request Format
+
+The request body should be a JSON object (this is subject to change in patch version within the experimental phase). For the latest request format, please refer to the [implementation](https://github.com/GreptimeTeam/greptimedb/blob/main/src/log-query/src/log_query.rs):
+
+## Response
+
+This endpoint has the same response format as the SQL query endpoint. Please refer to the [SQL query response](/user-guide/protocols/http/#response) for more details.
+
+## Limitations
+
+- Maximum result limit: 1000 entries
+- Only supports tables with timestamp and string columns

docs/user-guide/query-data/overview.md

@@ -1,6 +1,6 @@
 ---
-keywords: [query languages, PromQL, SQL, views, CTE, query libraries, external data]
-description: Overview of query languages supported by GreptimeDB, including PromQL and SQL, and recommended libraries for querying data.
+keywords: [query languages, PromQL, SQL, views, CTE, query libraries, external data, log query]
+description: Overview of query languages and features supported by GreptimeDB, including PromQL, SQL, and log query capabilities.
 ---
 
 # Overview
@@ -9,6 +9,7 @@ description: Overview of query languages supported by GreptimeDB, including Prom
 
 - [PromQL](./promql.md)
 - [SQL](./sql.md)
+- [Log Query](./log-query.md) (Experimental)
 
 Since v0.9, GreptimeDB supports view and CTE just like other databases, used to simplify queries:
 

sidebars.ts

@@ -96,6 +96,7 @@ const sidebars: SidebarsConfig = {
             'user-guide/query-data/view',
             'user-guide/query-data/cte',
             'user-guide/query-data/query-external-data',
+            'user-guide/query-data/log-query',
           ],
         },
         { type: 'category', label: 'Manage Data', items: ['user-guide/manage-data/overview', 'user-guide/manage-data/data-index'] },