It can be anything! An apex, subdomain, or even a URL.

Results forgitlab.admin.gaminguniversity.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2023-01-22T11:09:09.829	2023-01-22T10:09:09	2023-04-22T10:09:08	gitlab.admin.gaminguniversity.com	gitlab.admin.gaminguniversity.com	C=US, O=Let's Encrypt, CN=R3
2023-01-22T11:09:09.497	2023-01-22T10:09:09	2023-04-22T10:09:08	gitlab.admin.gaminguniversity.com	gitlab.admin.gaminguniversity.com	C=US, O=Let's Encrypt, CN=R3
2022-10-24T05:48:09.992	2022-10-24T04:48:09	2023-01-22T04:48:08	gitlab.admin.gaminguniversity.com	gitlab.admin.gaminguniversity.com	C=US, O=Let's Encrypt, CN=R3
2022-10-24T05:48:09.874	2022-10-24T04:48:09	2023-01-22T04:48:08	gitlab.admin.gaminguniversity.com	gitlab.admin.gaminguniversity.com	C=US, O=Let's Encrypt, CN=R3