private static void configure(FleetControllerOptions.Builder builder, SlobroksConfig config) {
        String[] specs = new String[config.slobrok().size()];
        for (int i = 0; i < config.slobrok().size(); i++) {
            specs[i] = config.slobrok().get(i).connectionspec();
        }
        builder.setSlobrokConnectionSpecs(specs);
    }
The {@link VespaZooKeeperServer} argument is required by the injected {@link ClusterController},
to ensure that zookeeper has started before it starts polling it. It must be done here to avoid
duplicates being created by the dependency injection framework.
clustercontroller-apps/src/main/java/com/yahoo/vespa/clustercontroller/apps/clustercontroller/ClusterControllerClusterConfigurer.java