Two outages happened together on 24th of June 2019 impacting different areas of DatoCMS.

One was Cloudflare: https://www.cloudflarestatus.com/incidents/46z55mdhg0t5 which would have impacted the GraphQL endpoint which had given time outs to certain IP ranges.

The other was with Heroku, which have impacted both GraphQL and REST APIs: https://status.heroku.com/incidents/1804

If you want more information or leave a comment, you can do that here: https://community.datocms.com/t/downtime-june-24th-2019/53