Grafana Enterprise Metrics (GEM) 1.4 introduces significant features such as cross-cluster query federation and out-of-the-box self-monitoring to enhance the multi-tenanted, horizontally scalable Prometheus-as-a-Service experience. The cross-cluster query federation feature allows users to query multiple GEM clusters simultaneously by using a federation frontend component that aggregates responses from various targets, including Prometheus-compatible APIs like Thanos and Cortex, facilitating hybrid metrics setups. This feature is beneficial for handling scenarios like maintaining separate production and development clusters, ensuring data privacy by geographical restrictions, and providing redundancy. Meanwhile, the self-monitoring feature is designed to be deployable with minimal setup across various architectures, offering automatic health metrics visualization through a dedicated system tenant and pre-configured dashboards. These enhancements aim to provide centralized observability teams with robust tools for maintaining and monitoring their metrics infrastructure efficiently.