Comment 5 for bug 1307747

Yes, that would be enough to fix the messages appearing in the log file, but my last comment was more about why is the create event happening so often?

# release-upgrade-available is provided by /usr/lib/ubuntu-release-upgrader/release-upgrade-motd
start on (
    file FILE=/var/lib/ubuntu-release-upgrader/release-upgrade-available EVENT=create
)

I believe the intent of the release-upgrade-motd is to only check for a new release at most once per day, and based off the data in the log file (comment 3) it is being checked for more than that (or the file is being "created").