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The cluster name is useful to identify resources created in different k8s clusters, especially in the cloud environment, the cluster name is always injected into the name of the cloud resources(e.g. the load balancer, volume, etc.), which is helpful for the cluster resource clean up. The magnum cluster UUID is used as the value of '--cluster-name' option. Story: 2004242 Task: 27766 Change-Id: I245a8869948a0b8bfa8d5cc32e7fb9277477026a