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

Results fortraefik.suhail.cloudcomputer.app

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-02-04T04:18:16.077	2020-02-04T03:18:15	2020-05-04T03:18:15	traefik.suhail.cloudcomputer.app	traefik.suhail.cloudcomputer.app	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-02-04T04:18:15.692	2020-02-04T03:18:15	2020-05-04T03:18:15	traefik.suhail.cloudcomputer.app	traefik.suhail.cloudcomputer.app	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-12-05T08:02:59.391	2019-12-05T07:02:59	2020-03-04T07:02:59	traefik.suhail.cloudcomputer.app	traefik.suhail.cloudcomputer.app	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-12-05T08:02:59.187	2019-12-05T07:02:59	2020-03-04T07:02:59	traefik.suhail.cloudcomputer.app	traefik.suhail.cloudcomputer.app	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3