Why are there a bunch of .listing files for in my MODx 2.3.0 site?

I was just reviewing a MODx 2.3.0 site of mine determining what updates or improvements I could make, and I noticed a bunch of .listing files. There are mulitiple instances pepper about in various directories. I found them in:

The root
assets/components
assets/components/tinymce
assets/images
assets/stylesheets
assets/javascripts

And still looking for more...

Each looks like a log of activity.

drwxr-xr-x 6 3394 inetuser 4096 Jun 20 2013 .
drwx---r-x 13 3394 inetuser 8192 Jul 10 19:30 ..
drwxr-xr-x 5 3394 inetuser 4096 Jul 2 2013 components
drwxr-xr-x 5 3394 inetuser 4096 Jul 6 2013 images
drwxr-xr-x 2 3394 inetuser 4096 Jul 4 2013 javascripts
drwxr-xr-x 2 3394 inetuser 4096 Jul 4 2013 stylesheets

Should I be concerned? This site was experiencing serious issues when it was MODx 2.1.x. I migrated it to a cPanel environment, and updated to 2.3.0. The site seems to be functioning fine, but the presence of all of the .listing files is a bit alarming.