Founded in 2008, AppDynamics is an industry-leading APM (Application Performance Management) vendor that specializes in monitoring and managing dynamic applications and services. Its customers include such well-known companies as Cisco, Sony, Kraft, OpenTable, and Texas.gov, among many others.
I've written several ebooks for AppDynamics, including this posted sample, which delineates how five very different companies use AppDynamics to effectively manage application performance in modern-day Microsoft-based environments that incorporate Microsoft's .NET framework and Azure public cloud solution.