Docs: Add usage stats preview to doc (#43995)

* Docs: Add usage stats preview to doc

* Fix: remove permissions references

docs/sources/http_api/admin.md

@@ -282,6 +282,46 @@ Content-Type: application/json
 ## Pause all alerts
 
 `POST /api/admin/pause-all-alerts`
+
+Only works with Basic Authentication (username and password). See [introduction](http://docs.grafana.org/http_api/admin/#admin-api) for an explanation.
+
+**Example Request**:
+
+```http
+POST /api/admin/pause-all-alerts HTTP/1.1
+Accept: application/json
+Content-Type: application/json
+
+```
+
+JSON Body schema:
+
+- **paused** – If true then all alerts are to be paused, false unpauses all alerts.
+
+**Example Response**:
+
+```http
+HTTP/1.1 200
+Content-Type: application/json
+
+```
+
+## Auth tokens for User
+
+`GET /api/admin/users/:id/auth-tokens`
+
+Return a list of all auth tokens (devices) that the user currently have logged in from.
+
+Only works with Basic Authentication (username and password). See [introduction](http://docs.grafana.org/http_api/admin/#admin-api) for an explanation.
+
+#### Required permissions
+
+See note in the [introduction]({{< ref "#admin-api" >}}) for an explanation.
+
+| Action               | Scope           |
+| -------------------- | --------------- |
+| users.authtoken:list | global:users:\* |
+
 **Example Request**:
 
 ```http