On November 5, 2021 (a Friday of course), we've deployed innocent-looking gem updates. Minor versions of Ruby on Rails, Ruby Sentry client, Ruby Slack client, http libraries, Puma, Devise, OmniAuth Ruby client, Mongoid, and a few test gems. However, something went very wrong. We saw odd Stripe errors on Airbrake. Then, on our Stripe account, we saw this: In less than 1h, we've created 474 new subs