The only silver lining for us during COVID-19 was that we got a chance to optimize our resources in our run to cut costs — a long-pending activity. All the teams across the organization were focused on reducing the operating costs as much as possible. Similarly, DevOps teams were mainly concerned with costs related to our infrastructure. Cross-AZ data transfer cost was one of the major contributors which ultimately led to a discussion around moving the non-critical workloads to a single AZ in order to reduce cross-AZ data transfer due to chatter between applications and trim some of the cross-AZ data transfer cost. This blog will discuss the challenges we faced while migrating our Kubernetes workload to a single AZ.