We've replayed all the Hooks and Tasks that were delayed throughout the outage. Everything is now running like normal! If you are still missing Tasks, please email us firstname.lastname@example.org
The core issue is related to how a message broker stopped passing along messages at any appreciable speed -- we're unsure of the root cause of this, but it seems to have resolved completely with a full cluster restart. We will be doing some active investigations and will report back as we have more information.