All reports of systemd-service-file-refers-to-obsolete-target for the archive. The extended description of this tag is:
The systemd service file refers to an obsolete target.
Some targets are obsolete by now, e.g. syslog.target or dbus.target. For example, declaring After=syslog.target is unnecessary by now because syslog is socket-activated and will therefore be started when needed.
This tag has not been emitted in any package tested by Lintian.