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F30: System-Wide Change proposal: DNF UUID

<a href="https://fedoraproject.org/wiki/Changes/DNF_UUID" title="https://fedoraproject.org/wiki/Changes/DNF_UUID">https://fedoraproject.org/wiki/Changes/DNF_UUID</a>

== Summary ==
Right now, we estimate installed Fedora systems by counting unique IP
addresses which show up in our updates mirror statistics. We need
better data than that. There are some proposals for more complicated
systems, but a quick thing we can do is implement a per-system UUID
(unique identifier) and count that instead of IP addresses.

This is what openSUSE does — see <a href="https://metrics.opensuse.org/" title="https://metrics.opensuse.org/">https://metrics.opensuse.org/</a> for
live stats. See also
[https://lists.fedoraproject.org/archives/list/council- ... at lists dot fedoraproject.org/thread/J436ZG74X6MIOES377Q7UGZEXX73ZNUM/
this previous Fedora Council discussion] for background.

== Owner ==

* Name: [[User:mattdm|Matthew Miller]]
* Email: mattdm

== Detailed Description ==

=== The problem ===

* A. Currently, we can only count Fedora OS use by observing IP
addresses. This is subject to undercounting due to NAT — and to
overcounting due to short DHCP leases and laptops moving between work
or school and home or coffee shop.
* B. We can count what releases are observed, but we can’t distinguish variants.
* C. We can’t count quickly because various logs are copied back to a
central server and data is not consistent for several days.

=== Constraints ===
* The Fedora community cares about privacy and is adverse to tracking
measures. We don't want to track; just count.
* For this reason, we don’t want to use any identifier like
/etc/machine-id which may be used for other purposes.
* And, also for that reason, there needs to be a relatively easy way to opt out.
* This needs to work with Yum/DNF, MicroDNF, PackageKit, Cockpit,
rpm-ostree, GNOME Software, Muon, Apper, and software update
mechanisms used in other spins.
* We need to be able to distinguish between short-lived instances
(like temporary containers or test machines) and actual installations.

=== Non-Goals ===
* We don’t want to track users, just count systems.
* Except for distinguishing temporary installations from “real” use,
we don’t need to track systems over time. We just want a daily or
weekly moment-in-time count.
* Being able to see how systems are upgraded over time might be
interesting but isn’t as important as privacy concerns.

=== Other Elements ===
* VARIANT_ID will be set in /etc/os-release. See [[Changes/Label Our
Variants]] We want that, plus VERSION_ID and machine architecture.
* We may also want each report to contain a boolean flag showing
whether the system has been in use for at least 24 hours to help
separately categorize test and other throw-away instances.
* openSUSE already uses a UUID in zypper; this is ground already traveled
* Yum and DNF have built in support for fileset variables which can be
‘removed’ to deal with privacy issues.

See <a href="https://bugzilla.redhat.com/show_bug.cgi?id=1542060" title="https://bugzilla.redhat.com/show_bug.cgi?id=1542060">https://bugzilla.redhat.com/show_bug.cgi?id=1542060</a>

== Benefit to Fedora ==

* Better metrics overall
* Public stats page updated automatically
* Better knowledge of relative use of different variants
* Insight into Fedora's use in short-lived test systems and temporary
containers vs. longer-term installations

== Scope ==
* Proposal owners: work with DNF team and infrastructure to implement
the UUID feature and corresponding backend data collection
* DNF team: feature work
* Maintainers of other package management tools: make sure feature
works in these cases as well
* Other developers: Spin maintainers should make sure that VARIANT_ID
is being set in /etc/os-release
** List of deliverables: affects all deliverables
* Policies and guidelines: none
* Trademark approval: none

== Upgrade/compatibility impact ==
Older versions will not have the UUID counting enabled; we will keep
collecting stats in the traditional way for those systems.

== How To Test ==
Once the system is in place, we will see data collected.

== User Experience ==
User experience will not change. Users who wish to opt out of counting
will have an easy way to do so.

== Dependencies ==
Package managers.

== Contingency Plan ==
* Contingency mechanism: continue counting the old way
* Contingency deadline: does not block release; we can ship with the
feature incomplete, although it would certainly be most useful to have
it available at GA
* Blocks release? No
* Blocks product? No

== Documentation ==
Release notes need to be written, and documentation describing how to opt out.

== Release Notes ==
This needs to be written but depends on exact implementation.