This article is about building and deploying an SDK (Software Development Kit) for a REST API, with a focus on monitoring to ensure optimal performance. The author outlines the importance of monitoring in maintaining deployment integrity and user satisfaction, highlighting its benefits such as early issue detection, performance optimization, predictive maintenance, continuous improvement, and user experience enhancement. The article then guides readers through generating an SDK from their API, deploying it to Lambda, and integrating it with a test app for monitoring.