Hi 
Your subdomain […].discourse.diy hasn’t been crawled in 7 days.
If your site remains inactive, the DNS record will be disabled in 7 days.
To keep your subdomain active, make sure your Discourse site is running and accessible at canapin.discourse.diy.
Is there anything special to be done? This is a standard install. The site is not on an intranet and is always accessible.