Status: OUT
The zero-trust infrastructure stack's dependence on 168.63.129.16 for both DNS resolution and health probing creates an operational coupling with DNS asymmetries: misconfiguring custom DNS (which requires preserving the infrastructure IP), failing to renew DHCP after DNS changes, or omitting FQDNs in cross-VNet queries can break the same infrastructure IP that health probes depend on — making DNS configuration errors a cascade failure point for load balancer health.