Thank you hideou aoi for the report and to Athos for the excellent
analysis!
Summary:
1. On a fresh Noble installation, /etc/default/sysstat says
ENABLED="false" but contrary to that the service is active, and further
if/when the sysstat package is upgraded due to a bugfix, it will become
inactive.
2. On a system upgraded from a previous Ubuntu release, given the root
cause analysis I assume that the service will actually be inactive,
meaning that behaviour is different between systems that have been
upgraded from prior releases and systems that have been freshly
installed.
We now have a question of how to re-converge this divergence. Should all
systems have the service active by default, or inactive? Do we add a
third category by not touching existing services, and if we do that,
should systems installed or upgraded after our fix have the service
active or inactive?
In 24.04 we started to ship sysstat by default as part of a more general
performance engineering effort, to make Ubuntu systems ready for
performance engineering by default. For sysstat to be useful for that
purpose though, the data it collects needs to be available.
I've done some analysis that suggests that the impact of having sysstat
services enabled by default would be negligible. I'll post details of
that analysis separately.
Therefore I think the path forward is to ensure that sysstat is
correctly enabled on 24.04 by default.
This would mean fixing the packaging issue that causes the service to
run in certain circumstances even when ENABLED="false" is set in
/etc/default/sysstat, but also defaulting to ENABLED="true" and making a
one-off change to /etc/default/sysstat on users' systems when they
upgrade to the fixed packaging.
For users who have installed 24.04 directly, sysstat services are
already enabled, and /etc/default/sysstat would be changed to match this
reality.
For those who have already upgraded to 24.04 would have sysstat services
get enabled when they receive the fix, but that impact is negligible and
upgrades aren't officially supported yet, so this seems acceptable.
Users who don't want this should be able to adjust ENABLED="false"
This bug was entitled "sysstat.service is enabled by default on 24.04
lts" and I don’t want to take that over, so I’ve created separate bugs
to track the other issues:
Bug 2073284 “sysstat service enablement state mismatches debconf and
/etc/default/sysstat setting”
Bug 2073285 “sysstat service is not enabled by default”
This bug, then, should be “Won’t Fix” since the outcome is that the
service _should_ be enabled by default. Thank you for filing it though -
the inconsistency you identified is indeed a bug and I’ll track the fix
for that in the other bugs.
** Changed in: sysstat (Ubuntu)
Status: Triaged => Won't Fix
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https://bugs.launchpad.net/bugs/2066117
Title:
sysstat.service is enabled by default on 24.04 lts
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