Same here, pretty vanilla Jessie running in VirtualBox. No rsyslog custom config.
Sep 22 06:25:05 server1 rsyslogd: [origin software="rsyslogd" swVersion="8.4.2" x-pid="16473" x-info="http://www.rsyslog.com"] rsyslogd was HUPed
Sep 22 06:26:53 server1 rsyslogd0: action 'action 17' resumed (module 'builtin:ompipe') [try http://www.rsyslog.com/e/0
Sep 22 06:26:53 server1 rsyslogd-2359: action 'action 17' resumed (module 'builtin:ompipe') [try http://www.rsyslog.com/e/2359
The HUP happens every day at 06:25, and predictably it's caused by logrotate's cronjob. I checked and my Wheezy box works exactly the same way, except it doesn't throw those 2 error messages minutes later. On Jessie, it consistently does.