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

Results forwww.status-mailchannels-net-27b2244a-3077-4302-8fc8-75b08a72af8a.saas.atlassian.com

Name	TTL	Value
www.status-mailchannels-net-27b2244a-3077-4302-8fc8-75b08a72af8a.saas.atlassian.com	300	0 issue "globalsign.com "
www.status-mailchannels-net-27b2244a-3077-4302-8fc8-75b08a72af8a.saas.atlassian.com	300	0 issue "letsencrypt.org "

CAA