One important way testing environments and production environments necessarily differ is very germane to discussion of this problem. If you have an issue in 1 o

One important way testing environments and production environments necessarily differ is very germane to discussion of this problem. If you have an issue in 1 of 64 cores on a CPU on 1 out of 1000 CPUs, what are the chances your testing environment will ever see the issue? Do you have 10,000 CPUs in your testing environment? I know I don't. At scale we really do need to think about monitoring, automated diagnosis, and recovery.