The application has a retry mechanism that will keep trying until a connection succeeds (with an exponential backoff), but it doesn't handle a case where the server is basically rejecting the messages on purpose (due to capacity issues). Suddenly all applications will start retrying the connection at once and there is no way to turn if off. So it will make the problem even much worse than it already is. They have added a server feature flag yesterday to change the maximum backoff time and they also added the handling of HTTP 508 error response.