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I noticed my VM with a fairly barebones Debian 11 install periodically tries to connect to debian.map.fastlydns.net on port 80.

It looks like this domain is what the DNS record of http://deb.debian.org points to (and has for at least a year), so it seems to be a legitimate request somehow related to package update tracking.

But what is doing this? Debian doesn't have a MOTD showing available updates, and it usually seems to need manual running of apt update and apt upgrade to keep the system current. Could I opt-out of whatever service(s) cause these requests?

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apt itself sets up a daily apt update, even if unattended-upgrades isn’t installed; this is presumably what you’re seeing the effects of.

See apt-daily timer/service — where did it come from? for details.

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My best guess is that this may be the unattended-upgrades package at work.

From https://wiki.debian.org/UnattendedUpgrades:

The purpose of unattended-upgrades is to keep the computer current with the latest security (and other) updates automatically.

That simple overview doesn't quite square with my experience, since on all my Debian systems it seems I usually have patches to do in apt list --upgradeable until I manually upgrade. But perhaps it is applying some (just not all) updates on its own?

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