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

Results forazure.monitoring.dicoding.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-05-11T07:43:49.51	2020-05-11T06:43:48	2020-08-09T06:43:48	azure.monitoring.dicoding.com	azure.monitoring.dicoding.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-05-11T07:43:49.284	2020-05-11T06:43:48	2020-08-09T06:43:48	azure.monitoring.dicoding.com	azure.monitoring.dicoding.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-03-12T08:42:06.204	2020-03-12T07:42:05	2020-06-10T07:42:05	azure.monitoring.dicoding.com	azure.monitoring.dicoding.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-03-12T08:42:05.964	2020-03-12T07:42:05	2020-06-10T07:42:05	azure.monitoring.dicoding.com	azure.monitoring.dicoding.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3