Auth.log liste de opened and closed

Bonjour,

Je suis sur un serveur debian et j’ai depuis le début de l’installation toujours les même message dans le fichier auth.log
Pouvez-vous me dire si cela est normal?

1 17:09:01 debian CRON[23761]: pam_unix(cron:session): session closed for user root Dec 1 17:15:01 debian CRON[23825]: pam_unix(cron:session): session opened for user root by (uid=0) Dec 1 17:15:01 debian CRON[23825]: pam_unix(cron:session): session closed for user root Dec 1 17:17:01 debian CRON[23831]: pam_unix(cron:session): session opened for user root by (uid=0) Dec 1 17:17:01 debian CRON[23831]: pam_unix(cron:session): session closed for user root Dec 1 17:25:01 debian CRON[23892]: pam_unix(cron:session): session opened for user root by (uid=0) Dec 1 17:25:01 debian CRON[23892]: pam_unix(cron:session): session closed for user root Dec 1 17:35:01 debian CRON[23958]: pam_unix(cron:session): session opened for user root by (uid=0) Dec 1 17:35:01 debian CRON[23958]: pam_unix(cron:session): session closed for user root Dec 1 17:39:01 debian CRON[24004]: pam_unix(cron:session): session opened for user root by (uid=0) Dec 1 17:39:01 debian CRON[24004]: pam_unix(cron:session): session closed for user root Dec 1 17:45:01 debian CRON[24104]: pam_unix(cron:session): session opened for user root by (uid=0) Dec 1 17:45:01 debian CRON[24104]: pam_unix(cron:session): session closed for user root Dec 1 17:55:01 debian CRON[24204]: pam_unix(cron:session): session opened for user root by (uid=0) Dec 1 17:55:01 debian CRON[24204]: pam_unix(cron:session): session closed for user root Dec 1 18:00:01 debian CRON[24255]: pam_unix(cron:session): session opened for user root by (uid=0) Dec 1 18:00:01 debian CRON[24255]: pam_unix(cron:session): session closed for user root Dec 1 18:05:01 debian CRON[24319]: pam_unix(cron:session): session opened for user root by (uid=0) Dec 1 18:05:01 debian CRON[24319]: pam_unix(cron:session): session closed for user root