This helps you to diagnose problems on the production environment if you are running Apache or Apache mod_balancer. Put to your <virtualhost>
# timestamp referer useragent, server time seconds/microseconds, transfered bytes input/output, which balancer was usedLogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" duration:%T/%D io:%I/%O balancer:%{BALANCER_WORKER_NAME}e"TransferLog /var/log/apache2/yoursite.logMore info
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