As described in https://discuss.circleci.com/t/product-update-infrastructure-failure-badge-in-circleci-ui/47282/8 from the customer standpoint it is unclear why the server (especially when reliant on app.circleci.com) has failed.

We've tracked a few of these back to there being issues with memory but there are a few other causes such as using a port in the range of 32768 - 60999 (https://circleci.com/docs/executor-intro/#port-ranges) which support suggested may be a problem.

As a customer troubleshooting build failures on a system that's been stopped by an outside event it's basic troubleshooting for us to have a reasonable error message to work with.