If you want to globally change how modproxy logs or the location/name of it's logfiles, you'll want to modify /data/wre/etc/modproxy.conf,

If you want to modify the modproxy on a per site basis, you want to modify the modproxy config file for each site you want to customize. (data/wre/etc/*.modproxy )

The following are pertainant directives. Comments below are taken from the /data/wre/etc/modproxy.conf file.

ErrorLog: The location of the error log file. If you do not specify an ErrorLog directive within a <VirtualHost> container, error messages relating to that virtual host will be logged here.  If you *do* define an error logfile for a <VirtualHost> container, that host's errors will be logged there and not here.

Example:

ErrorLog /data/wre/var/logs/modproxy.error.log

LogLevel: Control the number of messages logged to the error_log. Possible values include: debug, info, notice, warn, error, crit, alert, emerg.

Example:

LogLevel warn

LogFormat: defines some format nicknames for use with a CustomLog directive (see below).

Example:

LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined

LogFormat "%h %l %u %t \"%r\" %>s %b" common

LogFormat "%{Referer}i -> %U" referer

LogFormat "%{User-agent}i" agent

You'll need to enable mod_logio.c to use %I and %O
Example:

LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %I %O" combinedio

CustomLog: The location and format of the access logfile (Common Logfile Format). If you do not define any access logfiles within a <VirtualHost> container, they will be logged here.  If you *do* define per-<VirtualHost> access logfiles, transactions will be logged therein and *not* in this file.

Example:

CustomLog /data/wre/var/logs/access.log common

If you would like to have agent and referer logfiles, uncomment the following directives.

Example:

CustomLog /data/wre/var/logs/referer_log referer

CustomLog /data/wre/var/logs/agent_log agent

If you prefer a single logfile with access, agent, and referer information (Combined Logfile Format) you can use the following directive.

Example:

CustomLog /data/wre/var/logs/access_log combined