// available at client sidecar, so that telemetry filter could use for metric labels. This is useful for two cases:
	// server does not have sidecar injected, and request fails to reach server and thus metadata exchange does not happen.
	// Due to performance concern, telemetry metadata is compressed into a semicolon separated string:

  oneof destination {
    // TODO: add support for hostname lookup
    NamespacedHostname hostname = 1;
    NetworkAddress address = 2;
  }
  // port to reach the gateway at for mTLS HBONE connections
  uint32 hbone_mtls_port = 3;
  reserved "hbone_single_tls_port";
  reserved 4;
}

// NetworkAddress represents an address bound to a specific network.