Pi logs?

[Delboy]

Can anyone tell me what this is all about from my Auth log on the pi3

Jan 30 10:17:01 Delsraspberrypi CRON[2261]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 30 10:17:01 Delsraspberrypi CRON[2261]: pam_unix(cron:session): session closed for user root
Jan 30 11:17:01 Delsraspberrypi CRON[2324]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 30 11:17:01 Delsraspberrypi CRON[2324]: pam_unix(cron:session): session closed for user root
Jan 30 12:17:01 Delsraspberrypi CRON[2404]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 30 12:17:01 Delsraspberrypi CRON[2404]: pam_unix(cron:session): session closed for user root
Jan 30 13:17:01 Delsraspberrypi CRON[2463]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 30 13:17:01 Delsraspberrypi CRON[2463]: pam_unix(cron:session): session closed for user root
Jan 30 14:17:01 Delsraspberrypi CRON[2524]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 30 14:17:01 Delsraspberrypi CRON[2524]: pam_unix(cron:session): session closed for user root
Jan 30 15:17:02 Delsraspberrypi CRON[2607]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 30 15:17:02 Delsraspberrypi CRON[2607]: pam_unix(cron:session): session closed for user root
Jan 30 16:17:01 Delsraspberrypi CRON[2682]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 30 16:17:01 Delsraspberrypi CRON[2682]: pam_unix(cron:session): session closed for user root
Jan 30 17:17:01 Delsraspberrypi CRON[2737]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 30 17:17:01 Delsraspberrypi CRON[2737]: pam_unix(cron:session): session closed for user root
Jan 30 18:17:01 Delsraspberrypi CRON[2843]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 30 18:17:01 Delsraspberrypi CRON[2843]: pam_unix(cron:session): session closed for user root
Jan 30 19:17:01 Delsraspberrypi CRON[2952]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 30 19:17:01 Delsraspberrypi CRON[2952]: pam_unix(cron:session): session closed for user root
Jan 30 20:17:01 Delsraspberrypi CRON[3019]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 30 20:17:01 Delsraspberrypi CRON[3019]: pam_unix(cron:session): session closed for user root
Jan 30 21:17:01 Delsraspberrypi CRON[3078]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 30 21:17:01 Delsraspberrypi CRON[3078]: pam_unix(cron:session): session closed for user root
Jan 30 22:17:01 Delsraspberrypi CRON[3135]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 30 22:17:01 Delsraspberrypi CRON[3135]: pam_unix(cron:session): session closed for user root
Jan 30 23:17:01 Delsraspberrypi CRON[3197]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 30 23:17:01 Delsraspberrypi CRON[3197]: pam_unix(cron:session): session closed for user root
Jan 31 00:17:01 Delsraspberrypi CRON[3258]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 31 00:17:01 Delsraspberrypi CRON[3258]: pam_unix(cron:session): session closed for user root
Jan 31 01:17:01 Delsraspberrypi CRON[3318]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 31 01:17:01 Delsraspberrypi CRON[3318]: pam_unix(cron:session): session closed for user root
Jan 31 02:17:01 Delsraspberrypi CRON[3365]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 31 02:17:01 Delsraspberrypi CRON[3365]: pam_unix(cron:session): session closed for user root
Jan 31 03:17:01 Delsraspberrypi CRON[3416]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 31 03:17:01 Delsraspberrypi CRON[3416]: pam_unix(cron:session): session closed for user root
Jan 31 04:17:01 Delsraspberrypi CRON[3510]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 31 04:17:01 Delsraspberrypi CRON[3510]: pam_unix(cron:session): session closed for user root
Jan 31 05:17:01 Delsraspberrypi CRON[3561]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 31 05:17:01 Delsraspberrypi CRON[3561]: pam_unix(cron:session): session closed for user root