Some customers reported sporadic test failures from approximately 9:30pm - 11:30pm Pacific time on April 1st. After investigation, we found the these tests were accessing Cloudflare hosted domains and that Cloudflare was reporting an issue with DNS resolution from AWS Route 53: https://www.cloudflarestatus.com/incidents/ctfqh8z7ghqs. Our infrastructure is hosted at AWS and DNS lookups use AWS Route 53, so these tests were not able to resolve the domains and thus could not open the website. The issue has been resolved by Cloudflare.