Fix/document meta query parameter

content/guides/04.connect/3.query-parameters.md

@@ -1,7 +1,7 @@
 ---
 stableId: 2627d8eb-784f-4197-8d66-f180347d1b4d
 title: Query Parameters
-description: Learn about Directus query parameters - fields, filter, search, sort, limit, offset, page, aggregate, groupBy, deep, alias, and export. Understand how to customize your API requests and retrieve specific data from your collections.
+description: Learn about Directus query parameters - fields, filter, search, sort, limit, offset, page, aggregate, groupBy, deep, alias, export, version, versionRaw, backlink, and meta. Understand how to customize your API requests and retrieve specific data from your collections.
 ---
 
 Most Directus API endpoints can use global query parameters to alter the data that is returned.
@@ -554,10 +554,15 @@ Note that it is not possible to use aliases on relational fields e.g. `alias[aut
 
 Saves the API response to a file. Valid values are `csv`, `json`, `xml`, `yaml`.
 
-```http [GET /items/posts]
-?export=type
+::code-group
+
+```http [REST]
+GET /items/posts
+	?export=csv
 ```
 
+::
+
 ## Version
 
 Queries a version of a record by version key when [content versioning](/guides/content/content-versioning) is enabled on a collection.
@@ -808,3 +813,34 @@ The articles collection consists of a many-to-one relation to Users called `auth
 ```
 
 ::
+
+## Meta
+
+Returns metadata about the result set alongside the requested data. Accepts `total_count`, `filter_count`, a comma-separated combination of the two, or `*` for both.
+
+| Value          | Description                                               |
+| -------------- | --------------------------------------------------------- |
+| `total_count`  | Total number of items in the collection, ignoring filters |
+| `filter_count` | Number of items matching the current filter/search        |
+
+::code-group
+
+```http [REST]
+GET /items/posts
+	?meta=total_count,filter_count
+```
+
+```graphql [GraphQL]
+# Not available. Use the collection's aggregated query instead:
+query {
+  posts_aggregated {
+    countAll
+  }
+}
+```
+
+```js [SDK]
+// Not yet supported by the SDK: https://github.com/directus/directus/issues/22640
+```
+
+::