(st->host != NULL) ? st->host : hostname_g,
(st->name != NULL) ? st->name : "default"),
- status = plugin_register_complex_read (callback_name,
+ status = plugin_register_complex_read (/* group = */ NULL,
+ /* name = */ callback_name,
/* callback = */ apache_read_host,
/* interval = */ NULL,
/* user_data = */ &ud);