What CloudFlare Logs

This post details Cloudflare's initial logging policies and infrastructure. It explains that logs are generated for security threat identification and performance bottleneck analysis. For most customers, logs are discarded within 4 hours due to the massive scale (10 Petabytes/year and doubling every 4 months). Enterprise customers can opt to store logs for 3 days for export. Aggregate data is used for analytics (Cloudflare Analytics page) and security rule updates, with a stream processing engine correlating data at edge data centers. Error logs are kept for 1 week.