Retrieve usage metrics for a user
| Name | Type | Description |
| userid | string | either an integer user ID, "current", or "=" followed by a double uri-encoded user name |
| Name | Type | Description |
| authenticate | bool? | Force authentication for request (default: false) |
| Name | Value | Description |
| OK | 200 | The request completed successfully |
| Not Found | 404 | Requested user could not be found |