[linux] Explanation of polkitd Unregistered Authentication Agent

In /var/log/secure every time a user logs in or logs out I notice the messages shown below stating Unregistered and Registered Authentication Agent. I have not been able to figure out why these messages keep occurring. Any help with understanding why these messages are occurring and/or if it is possible to fix them would be greatly appreciated.

Aug 25 09:00:40 TEST polkitd(authority=local): Unregistered Authentication Agent for session /org/freedesktop/ConsoleKit/Session18 (system bus name :1.4467, object path /org/gnome/PolicyKit1/AuthenticationAgent, locale en_US.utf8) (disconnected from bus)

Aug 25 13:03:19 TEST polkitd(authority=local): Registered Authentication Agent for session /org/freedesktop/ConsoleKit/Session2 (system bus name :1.43 [/usr/libexec/polkit-gnome-authentication-agent-1], object path /org/gnome/PolicyKit1/AuthenticationAgent, locale en_US.utf8)

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I found this problem too. Because centos service depend on multi-user.target for none desktop Cenots 7.2. so I delete multi-user.target from my .service file. It had missed.