slackbuilds/system/jenkins/files/logrotate.jenkins

/var/log/jenkins/jenkins.log /var/log/jenkins/jenkins_console.log {
    su jenkins jenkins
    compress
    dateext
    maxage 365
    rotate 99
    size=+4096k
    notifempty
    missingok
    create 644
    postrotate
     kill -s SIGALRM $(cat /var/run/jenkins.pid)
    endscript
}