It's been decided to simply add in the option for either diskspace (/(root) mounted installs) or diskspaceH (/home mounted installs) to the plugins menu for install/uninstall on the dashboard.
Anyone using the current v2.3.0 can do the following for the update.
This will match your install with that of the master repo for the dashboard: seen here.
The output will look similar to the following:
root@quickbox:/srv/rutorrent/home# git pull
remote: Counting objects: 10, done.
remote: Compressing objects: 100% (10/10), done.
remote: Total 10 (delta 6), reused 2 (delta 0), pack-reused 0
Unpacking objects: 100% (10/10), done.
89ec69c..d567f28 master -> origin/master
bd903f0..831abed development -> origin/development
inc/panel.menu.php | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
Now check your widgets menu tab on your dashboard and you should see the following added to your list.