docs: public final void addHostTag(final boolean canonical) {
      try {
        if (canonical) {
          addExtraTag("fqdn", InetAddress.getLocalHost().getCanonicalHostName());
        } else {
          addExtraTag("host", InetAddress.getLocalHost().getHostName());
        }
      } catch (UnknownHostException x) {
        LOG.error("WTF?  Can't find hostname for localhost!", x);
        addExtraTag("host", "(unknown)");
      }
    }