I’m standardizing an active-active, multi-region baseline across AWS and GCP and need solid resources beyond vendor glossies — ideally runbooks or reference designs that detail failover automation, data consistency patterns, and blast-radius isolation. Current targets: about 10k rps steady and RTO <5 min using Route 53 ARC with Terraform 1.9; evaluating GCP equivalents with global HTTP(S) LB plus Cloud DNS routing policies. If you’ve got battle-tested writeups or repos that held up in production game days, I’d appreciate pointers.