Package: certbot Version: 0.10.2-1 When invoking 'certbot', with or without arguments, the directory timestamp of /etc/letsencrypt is modified. This is new behavior as of v0.10.2-1.
It is recommended (citation needed!) to not modify files/dirs in /etc/ every time a cmd is executed, rather only when config files are modified. Debian/Stretch Linux host 4.9.0-8-amd64 #1 SMP Debian 4.9.130-2 (2018-10-27) x86_64 GNU/Linux