Example from Alexander Gerasiov (Wishlist bug report #363067):
--------------------------------------------------------------

So here is an example of crontab script I'm using on my host:

=============
$cat /etc/cron.daily/webdruid
#!/bin/sh
# /etc/cron.daily/webdruid: webdruid daily maintenance script

WEBDRUID_BIN=/usr/bin/webdruid
WEBDRUID_SITELIST=/etc/webdruid/site.list
LOG_DIR=/var/log/apache2
REPORT_ROOT=/var/www/webdruid/

cat "$WEBDRUID_SITELIST" | while read HOSTNAME NAME;do (
        if [ ! -d "${LOG_DIR}/${NAME}" ];then exit 1;fi

        if [ ! -d "${REPORT_ROOT}${NAME}" ];then
                mkdir "${REPORT_ROOT}${NAME}"
        fi

        ${WEBDRUID_BIN} -Q -n "${HOSTNAME}" -o "${REPORT_ROOT}${NAME}"
"${LOG_DIR}/${NAME}/access.log.1"

) done

exit 0
=============

Where in /etc/webdruid/site.list there are lines like
exampledomain1.com example1
exampledomain2.com example2

And my apache generate logs for that domains in
/var/log/apache2/example1/access.log and
/var/log/apache2/example2/access.log

I didn't hooked it to logrotate, because my logs rotates not too often
(at least for some of my sites), but I just know that their rotate period
is not less than 1 day.

PS The only change from default webdruid installation is 
"Incremental yes" in /etc/webdruid/webdruid.conf

PPS As my apache generate logs in subdir of /var/log/apache2 I've added

/var/log/apache2/*.log /var/log/apache2/*/*.log
                       ^^^^^^^^^^^^^^^^^^^^^^^^
in /etc/logrotate.d/apache2
(The same idea was used for apache1.3 previously.)