-struct conf_metadata* conf_service_add_metadata(struct conf_service *service,
- int field_id,
- const char *name,
- enum conf_metadata_type type,
- enum conf_metadata_merge merge,
- enum conf_setting_type setting,
- int brief,
- int termlist,
- int rank,
- int sortkey_offset,
- enum conf_metadata_mergekey mt);