GitOps has seen widespread adoption in the last few years due to the clear advantages over traditional CI/CD tools. However, with adoption comes the growing pains of scale: running and managing multiple clusters across different cloud providers represents a major hurdle for organizations wanting to adopt Kubernetes as a standard deployment platform. In particular, observability and security at scale are two thorny aspects that need to be addressed; we will demonstrate how it’s possible to tame the complexity of such scaled infrastructure via open-source tools, such as ClusterAPI, ArgoCD and Prometheus+Thanos to provide control and visibility over an arbitrary number of clusters. We will show a sample, created after our collective experience at large scale customers, which can automate the deployment of hundreds of clusters and applications automatically and securely, and collect metrics from all the ephemeral clusters along the way.