How the Dyn outage affected Cloudflare

What this post added

The post details the impact of the Dyn DDoS outage on Cloudflare's DNS infrastructure, specifically focusing on how CNAME-based origin configurations were affected due to external DNS resolution failures. It introduces the concept of 'serve stale while revalidating' as a change being implemented to mitigate similar future incidents by leveraging longer DNS record caching when upstream providers are unavailable.