I see, this must have been updated on a later version.
Under Ubuntu 16.04.5, and up to apt-1.2.27, the man page reads:
PERIODIC AND ARCHIVES OPTIONS
APT::Periodic and APT::Archives groups of options configure behavior of
apt periodic
updates, which is done by the /etc/cron.daily/apt script. See the top of
this script
for the brief documentation of these options.
This must have been fixed upstream in a later version.
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https://bugs.launchpad.net/bugs/1764928
Title:
Please document apt-daily
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