Difference between postgresql@10-main.service vs. postgresql@12-main.service

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Hi all,

why I have both: postgresql@10-main.service and postgresql@12-main.service

systemctl status show postgresql@10-main.service is running,

Is that okay ? or it should be 12 ?

Foreman and Proxy versions: foreman 3.5.1 , foreman-proxy 3.5.1

Distribution and version: Ubuntu 20.04.4 LTS