Designing a cloud system that adapts to different models and providers is not a one-time task. To ensure your system meets expectations and requirements, you need to continuously monitor and optimize it. Cloud monitoring tools like CloudWatch, Azure Monitor, Stackdriver, or New Relic can collect and analyze metrics and logs, such as performance, availability, usage, and errors. Additionally, cloud testing tools such as LoadRunner, JMeter, or BlazeMeter can simulate and measure the behavior and response of your system under different loads and conditions. Finally, cloud optimization tools like Cloudability, Cloudyn, or CloudHealth can help optimize cost and efficiency by identifying and eliminating waste, finding the best pricing options, and managing resource allocation and utilization. By following these principles and practices, you can design a cloud system that adapts to different models and providers while delivering the best value and quality for your business and users.