Docs: Add `telemetry` to the list of configuration options (#1348)

docs/cli/configuration.md

@@ -161,6 +161,24 @@ In addition to a project settings file, a project's `.gemini` directory can cont
   - **Default:** `vscode`
   - **Example:** `"preferredEditor": "vscode"`
 
+- **`telemetry`** (object)
+  - **Description:** Configures logging and metrics collection for Gemini CLI. For more information, see [Telemetry](../core/telemetry.md).
+  - **Default:** `{"enabled": false, "target": "local", "otlpEndpoint": "http://localhost:4317", "logPrompts": true}`
+  - **Properties:**
+    - **`enabled`** (boolean): Whether or not telemtery is enabled.
+    - **`target`** (string): The destination for collected telemetry. Supported values are `local` and `gcp`.
+    - **`otlpEndpoint`** (string): The endpoint for the OTLP Exporter.
+    - **`logPrompts`** (boolean): Whether or not to include the content of user prompts in the logs.
+  - **Example:**
+    ```json
+    "telemetry": {
+      "enabled": true,
+      "target": "local",
+      "otlpEndpoint": "http://localhost:16686",
+      "logPrompts": false
+    }
+    ```
+
 ### Example `settings.json`:
 
 ```json