apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/service/ClusterService.java/ClusterService/ClusterService
class ClusterService:  public ClusterService(
      final ClusterRepository clusterRepository,
      final AuditService auditService,
      final @Lazy NamespaceService namespaceService) {
    this.clusterRepository = clusterRepository;
    this.auditService = auditService;
    this.namespaceService = namespaceService;
  }