On Sep 20th, 2020 05:15 UTC, some of our customers sending outbound WhatsApp Messages via our Messages and Dispatch APIs experienced message failure. These messages would have failed with an "undeliverable" status. This continued until 05:35 UTC when we fixed this.
An automated database patch caused our database to malfunction. This stopped our platform from properly processing Whatsapp traffic.
We're working on disabling automated patching for our database.
We're also working on improving our alerting system so we can detect issues like this sooner.