private ConfigServer[] getConfigServers() {
        return Optional.of(options.allConfigServers())
                .filter(configServers -> configServers.length > 0)
                .orElseGet(() -> new ConfigServer[]{new ConfigServer(HostName.getLocalhost(), Optional.empty())});
    }
Represents a config server cluster.

@author Ulf Lilleengen
config-model/src/main/java/com/yahoo/vespa/model/container/configserver/ConfigserverCluster.java