Let's encrypt certificates are managed on brique.ldn-fai.net, installation and management was done using this howto: https://blog.sebian.fr/letsencrypt/

See LDN monitoring server

Certificates are under supervision (for expiration), warning if the expiration date is less than 30 days, and critical for 10 days.

Managed by lecm on brique.ldn-fai.net