FinOps extends beyond cloud cost management to include observability and infrastructure monitoring, where out-of-the-box solutions often fall short in features and affordability, prompting organizations to develop their own cost-effective monitoring systems using a mix of in-house talent and open-source libraries. A comprehensive monitoring application typically comprises a web interface, an application tier for data processing, and a database tier for data storage, with the flexibility to incorporate cloud and on-premises technologies like event queues. Cost management in infrastructure monitoring involves ensuring solutions are appropriately scaled to prevent overspending, utilizing cloud-native architecture analysis tools like AWS Well-Architected Framework and Azure Advisor to optimize resource provisioning. Multicloud cost management adds complexity as it requires careful monitoring and scaling of resources across different platforms, emphasizing the need to spin down idle or over-provisioned servers and regularly reassess non-production environments. Hidden costs, such as data retrieval and maintenance of open-source solutions, must be managed to ensure the sustainability of custom infrastructure monitoring solutions, which can effectively leverage modern FinOps best practices for native, hybrid, and multicloud environments.