Modern cloud infrastructure cannot be treated as a black box. The scale, elasticity, and ephemerality of services in Azure make it essential to architect systems that are observable, cost-aware, and compliance-ready from the ground up. In traditional on-premises systems, observability was often a second thought added reactively to debug production failures. In contrast, in the cloud-native era, observability must be designed as an intentional, first-class capability enabling platform teams to understand system behavior, optimize resources, detect threats, and demonstrate compliance before any issue arises.