Public bug reported:
apt, from 1.2.10 onwards (ie any version in Xenial, onwards) uses a
systemd timer instead of a cron.daily job. This is a good thing,
decoupling apt daily runs from the rest of cron, and ensuring other
cron.daily jobs are not blocked by up to half an hour by the default
settings of unattended-upgrades.
However the policy chosen is to have the apt daily script run at a
random hour of the day in a wrong headed attempt to reduce server load.
This has the side effect of running unattended-upgrades at random hours
of the day — such as business hours — rather than being confined to
between 6:25am and 6:55am, using the defaults.
A better policy would be to have the script activate at 6:00am plus an
interval of 20 minutes at one second intervals reducing the impact of
timezone population spikes, while still allowing unattended-upgrades to
run within a predictable interval, before 7am.
At the very least, some sort of note in the NEWS file detailing the new
behaviour would be welcome.
** Affects: apt (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1615482
Title:
apt-daily timer runs at random hours of the day
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