[Resolved] After monitoring the issue for a few hours, it seems that the issue was completely resolved from the third party service provider, and all Synthetic tests are back to normal operation.
May 6, 2021 8:29PM UTC
[Monitoring] Dynatrace Synthetics Tests are being negatively impacted by a third-party service outage (Cloudflare). Problems are being reported as DNS resolution failures. We are actively monitoring the situation and we will be providing updates as Cloudflare status changes.