I'm also interested to know. My contribution to the discussion: Something you could use to debug issues / detect weak points is a tracer. This book by Dick S

I'm also interested to know. My contribution to the discussion: Something you could use to debug issues / detect weak points is a tracer. This book by Dick Sites (Early Google Engineer) goes over the design and use of such a tracer: Understanding Software Dynamics (review: https://www.usenix.org/publications/loginonline/understanding-software-dynamics https://www.usenix.org/publications/loginonline/understandin...)