Ah nice. I wasn't previously familiar with Failsafe but I used Hystrix/Resilience4j in Java. At my last gig writing Go I noticed a distinct lack of fault tolerance in certain key services.

Go returning tuples as a norm and a way to handle simultaneously success and failure is the reason I believe go to be a fundamentally unsafe language. With a single binary return value you must successfully handle two cases, every time you increase the number of return flags, you double the complexity.