We've resolved the issue and the app is running in a normal state.
Post-mortem: https://blog.appsignal.com/2018/04/20/post-mortem-april-19th-2018.html
We've identified the issue: one of our MongoDB clusters has a very high locking rate, causing queues of data. We're working on resolving the issue.
We're currently investigating a build-up in our queues. Data processing may be delayed. We're on it, and will keep you posted.
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