docs: public static final void setGlobalTags(final Config config) {
      if (config == null) {
        throw new IllegalArgumentException("Configuration cannot be null.");
      }
      
      if (config.getBoolean("tsd.core.stats_with_port")) {
        global_tags = new HashMap<String, String>(1);
        global_tags.put("port", config.getString("tsd.network.port"));
      }
    }