Keep 14 days with helpful dates and the filenames do not change every day for your logs:

/var/log/app/app.log /var/log/app/app_something.log {
    rotate 14
    daily
    dateext
    compress
    missingok
    notifempty
    sharedscripts
    postrotate
        PIDFILE='/var/run/app/app.pid'
        [ -f ${PIDFLIE} ] && /bin/kill -USR1 $(cat ${PIDFILE})
    endscript
    dateext
}

If the app has the ability to rotate logs via a command-line argument (such as Squid) this could be used instead, or even better use Cronolog.

Test config

/usr/sbin/logrotate -d /etc/logrotate.conf

Category:Linux