The world's biggest known DDoS attack... so far.
Peaking at 1.35Tbps, the pounding of GitHub was truly massive, at more than 2x the peak traffic rate of 2016's Mirai attack. That said, GitHub did a solid job at incident response, including quickly shifting all their traffic Akamai, then dropping the hammer on a several bad traffic sources.
How ready is your business infrastructure -- from distributed SMBs to large data center environments -- for the next attack? Also, how will you respond if your critical SaaS apps are impacted, like a Dyn DNS-style outage?