Constantly repeating automount messages in /var/log/messages

Issue

Messages similar to the following are repeating in /var/log/messages:

Feb 25 14:53:36 hostname automount[4674]: st_expire: state 1 path /net
Feb 25 14:53:36 hostname automount[4674]: expire_proc: exp_proc = 140382752212736 path /net
Feb 25 14:53:36 hostname automount[4674]: expire_cleanup: got thid 140382752212736 path /net stat 0
Feb 25 14:53:36 hostname automount[4674]: expire_cleanup: sigchld: exp 140382752212736 finished, switching from 2 to 1
Feb 25 14:53:36 hostname automount[4674]: st_ready: st_ready(): state = 2 path /net
Feb 25 14:53:47 hostname automount[4674]: st_expire: state 1 path /misc
Feb 25 14:53:47 hostname automount[4674]: expire_proc: exp_proc = 140382752212736 path /misc
Feb 25 14:53:47 hostname automount[4674]: expire_cleanup: got thid 140382752212736 path /misc stat 0
Feb 25 14:53:47 hostname automount[4674]: expire_cleanup: sigchld: exp 140382752212736 finished, switching from 2 to 1
Feb 25 14:53:47 hostname automount[4674]: st_ready: st_ready(): state = 2 path /misc

In /etc/sysconfig/autofs, logging is disabled:

LOGGING="none"