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

Results forwww.grafana.ops-eu-west-k8s.afilias.tech

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-03-06T17:13:18.546	2020-03-06T16:13:18	2020-06-04T16:13:18	grafana.ops-eu-west-k8s.afilias.tech	grafana.ops-eu-west-k8s.afilias.tech	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-03-06T17:13:18.274	2020-03-06T16:13:18	2020-06-04T16:13:18	grafana.ops-eu-west-k8s.afilias.tech	grafana.ops-eu-west-k8s.afilias.tech	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-01-27T19:24:32.121	2020-01-27T18:24:31	2020-04-26T18:24:31	grafana.ops-eu-west-k8s.afilias.tech	grafana.ops-eu-west-k8s.afilias.tech	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-01-27T19:24:31.899	2020-01-27T18:24:31	2020-04-26T18:24:31	grafana.ops-eu-west-k8s.afilias.tech	grafana.ops-eu-west-k8s.afilias.tech	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3