From your own green soul, to reducing greenhouse gas emissions and contributing to organizational sustainability targets, crystal-ball says you will have to measure your clusters’ energy and carbon emissions sooner rather than later. Spoiler alert: it’s a journey and we’re starting it all together. Perhaps you've heard of Kepler, the eBPF/ML-based CNCF Project to monitor energy utilization in Kubernetes, promoted by the CNCF Environmental Sustainability TAG. There are several aspects you need to consider: How is energy utilization measured? What do the available metrics mean and how can they be used to produce useful real-world Prometheus queries and Grafana dashboards? And then… how can you map them to carbon emissions? What the heck is the Software Carbon Intensity specification? We’ve been staging Kepler in clusters with hundreds of workloads with diverse usage patterns, running in many node types and CSPs. We may be able to help you with these questions!