Provide details here.  Do not change the blocking bug.

Previously, systemd required services to have .service appended in systemctl commands;

$ sudo systemctl restart myservice
$ Failed to issue method call: Unit name myservice is not valid.
-bash: Failed: command not found
$ sudo systemctl restart myservice.service
[okay]

Starting with F18, if there is no dot suffix, systemctl will assume you meant a service and just work.

This should go in the release notes, because it's a common end-user complaint about the systemctl user interface.