Michael Still says: "Slack is a source deployment system and it’s the way we install applications on servers... An application install is called a Slack role... You can have more than one role per machine although if the roles are going to tread on each other then your installs."

It's one a.m. and I've just deployed the latest version of your application to the production server. I tested it on my local computer, I saw it work on the development server. Now it's broken and I'm trying to decide whether to try to quickly fix the problem or roll back, assuming I've left myself with an easy way to roll back.