All SSL certificates for Void are provided by LetsEncrypt via acmetool. Configuration for names requested in acmetool certs are done through various host variables.
Acmetool is configured to run under snooze, and should attempt to renew certificates once a day. Certificates that have more than 30 days remaining will not be renewed. Acmetool does not automatically restart services that consume certificates. In the case of web services, it is assumed that there will be a push that restarts services frequently enough that this will not be an issue.
In the future we may include certificate checks to restart services that do not support dynamic certificate reloading.