Let’s Encrypt has announced in the beginning of year, that it will no longer support ACMEv1 protocol for certificate renewal after June 1. 2020. At my work I run 4 Rails application instances with 12 web sites (domains) and have been using Let’s Encrypt certificates for years. They are automatically renewed every month. All I get is a mail indicating that certificates have been renewed. https://www.drgcms.org/blog/damjan-rems-526b8503835d1b13fb000002/how-to-fully-automate-renewing-of-lets-encrypt-certificates-for-multiple-sites-with-ruby-and-2020-03-04