I'm getting a large number of messages like this under CentOS-7. Is that normal? Or do I need to take some action (maybe reducing verbosity level)?

------------------------------------- Jul 16 17:43:01 localhost-002 systemd: Starting Session 54 of user tim. Jul 16 17:43:01 localhost-002 systemd: Started Session 54 of user tim. Jul 16 17:45:01 localhost-002 systemd: Starting Session 55 of user tim. Jul 16 17:45:01 localhost-002 systemd: Started Session 55 of user tim. Jul 16 17:50:01 localhost-002 systemd: Created slice user-0.slice. Jul 16 17:50:01 localhost-002 systemd: Starting Session 56 of user root. Jul 16 17:50:01 localhost-002 systemd: Started Session 56 of user root. Jul 16 17:52:01 localhost-002 systemd: Starting Session 57 of user tim. Jul 16 17:52:01 localhost-002 systemd: Started Session 57 of user tim. -------------------------------------