From where come the services listed in v$listener_network ?

Oracle Database 19.21 , Data Guard configuration

Hello ,

On my primary database the parameter service_names is only set to my SID name which is the same that my db_unique_name . However, a "select * from v$listener_network where type='SERVICE NAME'; " lists 2 other service names in adition to the one defined : <SID>_CFG and <SID>_PRIMARY .

I have only one listener , LISTENER who belongs to grid, which only specify my SID and the ASM SID . A lsnrctl status LISTENER shows my defined service plus the 2 services , and 3 other ASM services .

I checked DGMGRL configuration but I can't find where the <SID>_CFG and <SID>_PRIMARY services come from.