The ability for me as developer can see what my apps will do when it goes down so I know whether this app has been built correctly with fault tolerance at its core from day one! It's great because you don't have any worries about downtime/outages since everything runs internally within your own cloud infrastructure - no need external services like AWS EC2 etc.. If there are problems then they're internal only (no service level agreement) but very well documented here too if needed by customer support team who manage all tickets via Github issues system anyway!!