Network Performance Issues at Cloudflare
Incident Report for Synapse
Cloudflare has resolved the issue and services have resumed normal operation.
Posted Jul 02, 2019 - 08:19 PDT
Cloudflare is observing network performance issues. Customers may be experiencing 502 errors while accessing sites on Cloudflare.

For reference:

We are working on taking our services out of Cloudflare's proxy in the meantime.
Posted Jul 02, 2019 - 06:55 PDT
This incident affected: CORE APIs, [UAT] CORE APIs, and Developer Dashboard.