I’m building a CentOS 7 Asterisk and find my system log full of messages like this:

Mar 5 17:07:01 pbx2 systemd: Started Session 823 of user asterisk. Mar 5 17:07:01 pbx2 systemd: Starting Session 823 of user asterisk. Mar 5 17:07:11 pbx2 systemd: Removed slice user-1001.slice. Mar 5 17:07:11 pbx2 systemd: Stopping user-1001.slice.?

Does anyone know what this means?