The https://en.wikimini.org/ Let's Encrypt certificate was expired 5 days ago:
$ ssh demo.wikimedia.ch $ certbot renew --quiet --non-interactive Attempting to renew cert (en.wikimini.org-0001) from /etc/letsencrypt/renewal/en.wikimini.org-0001.conf produced an unexpected error: Missing command line flag or config entry for this setting: Input the webroot for en.wikimini.org:. Skipping. All renewal attempts failed. The following certs could not be renewed: /etc/letsencrypt/live/en.wikimini.org-0001/fullchain.pem (failure)
Probably nobody noticed this because the website is usually used in school periods.
I've updated the configuration adding this line:
/etc/letsencrypt/renewal/en.wikimini.org-0001.conf
[[webroot_map]] en.wikimini.org = /var/www/wikimini.org/www/w
Then renewed:
$ certbot renew --quiet $ apache2ctl graceful
The new certificate was issued fine. Fixed.