| `assignee_ids` | integer array | no | The ID of the user(s) to assign the issue to. |
| `assignee_id` | integer | no | The ID of the user to assign the issue to. Only appears on GitLab Free. |
| `assignee_ids`**(PREMIUM)** | integer array | no | The IDs of the users to assign the issue to. |
| `confidential` | boolean | no | Set an issue to be confidential. Default is `false`. |
| `created_at` | string | no | When the issue was created. Date time string, ISO 8601 formatted, for example `2016-03-11T03:45:40Z`. Requires administrator or project/group owner rights. |
| `description` | string | no | The description of an issue. Limited to 1,048,576 characters. |