rally-openstack/samples/tasks/scenarios/keystone/create-user.json

{
    "KeystoneBasic.create_user": [
        {
            "args": {},
            "runner": {
                "type": "constant",
                "times": 100,
                "concurrency": 10
            },
            "sla": {
                "failure_rate": {
                    "max": 0
                }
            }
        }
    ]
}