Cisco just announced their intent to acquire AppDynamics. AppDynamics is one of the leaders in the application performance monitoring (APM) space. Why is APM so important? Cloud.
Now it may sound marketing to just say "cloud" but the concepts and usage of cloud, as opposed to traditional infrastructure, are why this acquisition is so important. As enterprises shift more into cloud computing, whether it's on-premises or off-premises, they begin to see the true tenet of cloud, that the application is king.
In cloud, the final output of all the work is the application, as that's all the end-user sees. In many cases, especially in public cloud, IT won't have access or visibility into much of the underlying infrastructure and systems that support the application. In fact, as we move towards distributed systems and architectures, they shouldn't care. Thus, monitoring the application, from the end-user experience on back to the infrastructure, is the important cloud management pivot and APM is at the heart of that.