I thought it was global? 19 data centers were taken offline which "handle a significant proportion of [Cloudflare's] global traffic".
But if your clients are mostly asleep while this is happening, they might not notice.
I am in Lisbon and was not having trouble because Cloudflare's Lisbon data center was not affected. But over in Madrid there was trouble. It depended where you are.
Gotcha, so it was out internationally, but selectively.
From the article: "Depending on your location in the world you may have been unable to access websites and services that rely on Cloudflare. In other locations, Cloudflare continued to operate normally."
I did not notice Cloudflare going down. Only reason I knew was because of this thread. Either it was because I was asleep, or my local PoP wasn't affected.