503 Service Unavailable: No healthy endpoints to handle the request. If you're the owner of this app, see this article for more information: http://bit.ly/2uCFzOo
This is not good, since it means that (for example) https://kadira.io/academy/meteor-routing-guide is no longer accessible. Since Meteor acquired Kadira, I assume they are now responsible for old.kadira.io?
Can someone fix this, or else provide a new path to the Meteor Routing Guide? (This is an invaluable additional source of information beyond the Meteor Guide chapter on URLs and Routing. Indeed, the Meteor Guide chapter provides a link to the Kadira guide for more information).