file_data_register_notify_func(histogram_notify_cb, NULL, NOTIFY_PRIORITY_HIGH);
file_data_register_notify_func(collect_manager_notify_cb, NULL, NOTIFY_PRIORITY_LOW);
file_data_register_notify_func(metadata_notify_cb, NULL, NOTIFY_PRIORITY_LOW);
file_data_register_notify_func(histogram_notify_cb, NULL, NOTIFY_PRIORITY_HIGH);
file_data_register_notify_func(collect_manager_notify_cb, NULL, NOTIFY_PRIORITY_LOW);
file_data_register_notify_func(metadata_notify_cb, NULL, NOTIFY_PRIORITY_LOW);