OMG I found it thanks to your comment!
It was here:
The line reads:
0 */12 * * * root /opt/certbot-auto renew --quiet --no-self-upgrade --force-renewal
But I also have another file:
with this contents:
# /etc/cron.d/certbot: crontab entries for the certbot package # # Upstream recommends attempting renewal twice a day # # Eventually, this will be an opportunity to validate certificates # haven't been revoked, etc. Renewal will only occur if expiration # is within 30 days. # # Important Note! This cronjob will NOT be executed if you are # running systemd as your init system. If you are running systemd, # the cronjob.timer function takes precedence over this cronjob. For # more details, see the systemd.timer manpage, or use systemctl show # certbot.timer. SHELL=/bin/sh PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin 0 */12 * * * root test -x /usr/bin/certbot -a \! -d /run/systemd/system && perl -e 'sleep int(rand(43200))' && certbot -q renew
What do you think I should remove? Or… how?