@Override
    public String toString() {
        return hostname + (!aliases.isEmpty() ? " (aliases: " + aliases + ")" : "" ) +
               (flavor.map(value -> " (flavor: " + value + ")").orElse(""));
    }
The current Vespa version running on this host, or empty if not known
config-model/src/main/java/com/yahoo/config/model/provision/Host.java