Everything that you store in your version control systems becomes auditable. Before introducing a new code, you perform a code review. When you notice a bug, you can revert the change that introduced it or get back to the last working version. Your repository becomes the single point of truth regarding your entire system.
It's already useful when applied to the application code. However, extending the ability to audit configuration, helper services, metrics, dashboards, and even deployment strategies makes it even more powerful. You no longer have to ask yourself, "OK, so why did this configuration end up in production?" All you have to do is check the Git log.
