message: Note on deprecation
diff: @@ -83,8 +83,9 @@ async function getPortForNewAccessKeys(
  serverConfig: json_config.JsonConfig<server_config.ServerConfigJson>,
  keyConfig: json_config.JsonConfig<AccessKeyConfigJson>) {
  if (!serverConfig.data().portForNewAccessKeys) {
  - // For backward compatibility.
  + // NOTE(2019-01-04): For backward compatibility. Delete after servers have been migrated.
  if (keyConfig.data().defaultPort) {
  + // Migrate setting from keyConfig to serverConfig.
  serverConfig.data().portForNewAccessKeys = keyConfig.data().defaultPort;
  delete keyConfig.data().defaultPort;
  keyConfig.write();
  