What happened on the Internet during the Facebook outage

What this post added

This post analyzes the impact of the Facebook outage on Cloudflare's 1.1.1.1 DNS resolver, detailing a significant increase in SERVFAIL responses across DNS, DoT, and DoH protocols. It quantifies the load increase on the resolver and demonstrates its resilience by maintaining low response times. The post also uses DNS query data to illustrate traffic shifts to other internet services (social media, messaging, gaming, news) during the outage and analyzes Network Error Logging (NEL) data and WARP traffic to Facebook's network. Finally, it examines the silence of Facebook's crawlers and the impact on traffic with Facebook User-Agents hitting Cloudflare's CDN.