[$] Highlights from systemd v258: part one

The next release of systemd has been percolating for an unusually
long time. Systemd releases are usually about six months apart, but
v257 came out in
December 2024, and v258 just now seems to be nearing the finish
line; the third release candidate for v258 was published on
August 20 (release
notes). Now is a good time to dig in and take a look at some of
the new features, enhancements, and removals coming soon to
systemd. These include new workload-management features, a concept for
multiple home-directory environments, and the final, once-and-for-all
removal of support for control
groups version 1.