Hacker News Reader

Yes. Right now we are looking at installing an affiliate plugin on a Magento site with Varnish caching. Instead of inventing a new Magento/Varnish plugin, we are planning to use a javascript-driven solution.

If a Varnish instance keeps access logs, they can be used as traffic data source instead of the actual webserver. It makes no difference.

Actually, CloudFlare tells you the client's IP in a header CF-Connecting-IP, so you can add that to your log format.