          | The key of the resource group |
| <code>process_mode</code>  | string  | no                                | The process mode of the resource group. One of <code>unordered</code>, <code>oldest_first</code> or <code>newest_first</code>. Read <a href="../ci/resource_groups/index.md#process-modes">process modes</a> for more information. |</p>
<p><code>shell
curl --request PUT --data "process_mode=oldest_first" \
     --header "PRIVATE-TOKEN: &lt;your_access_token&gt;" "https://gitlab.example.com/ap