With the increasing complexity introduced by Kubernetes and cloud-native applications, managing financial operations (FinOps) has become crucial for organizations seeking to optimize costs. Kubernetes presents challenges in attributing costs due to its shared infrastructure and dynamic scalability, which complicates resource allocation and monitoring. OpenCost, an open-source project under the Cloud Native Computing Foundation (CNCF), addresses these challenges by providing a vendor-neutral specification for cost monitoring in Kubernetes environments. This initiative, supported by major cloud providers and tech companies, focuses on creating a standard for tracking resource usage and costs, facilitating better financial planning and efficiency. OpenCost's approach involves querying cloud APIs for cost data and aligning it with Kubernetes usage to provide a comprehensive view of resource allocation. As the specification evolves, it aims to become the default monitoring stack for cloud cost management, enabling organizations to adapt their FinOps practices to the dynamic nature of containerized workloads.