rally-openstack/samples/tasks/scenarios/keystone/create-update-and-delete-tenant.json

{
    "KeystoneBasic.create_update_and_delete_tenant": [
    {
            "args": {
                "name_length": 10
            },
            "runner": {
                "type": "constant",
                "times": 100,
                "concurrency": 10
            }
        }
    ]
}