rally-openstack/samples/tasks/scenarios/ceilometer/list-samples.json

{
    "CeilometerSamples.list_samples": [
        {
            "runner": {
                "type": "constant",
                "times": 10,
                "concurrency": 2
            },
            "context": {
                "users": {
                    "tenants": 2,
                    "users_per_tenant": 2
                }
            }
        }
    ]
}