If you use syslog-ng, you might find /var/log/messages has lots of lines like
Oct 18 17:42:06 stairs syslog-ng[2391]: Log statistics; processed='center(queued)=468', processed='center(received)=468', processed='destination(hosts)=0', processed='destination(d_boot)=0', processed='destination(d_auth)=42', processed='destination(d_cron)=256', processed='destination(d_mlal)=0', processed='destination(d_kern)=0', processed='destination(d_mesg)=100', processed='destination(d_cons)=0', processed='destination(d_spol)=0', processed='destination(d_mail)=70', processed='source(tcpgateway)=0', processed='source(s_sys)=468', processed='source(gateway)=0'
This is because it is default to output stats every 600 seconds. Add an entry like
stats_freq (86400);
in the options section of /etc/syslog-ng.conf and do a service syslog-ng reload (RHEL / Centos) to quieten it down a bit.
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