Monitoring the performance of applications today is difficult. It typically entails deep understanding and knowledge of an application and all its components. Containers have begun to make this easier by allowing us to break down applications and provide finer-grained information than ever before. cAdvisor has begun exposing higher level performance metrics aimed at answering the question “how are my applications performing?”. We will present what metrics are exposed and how these metrics can be used to automatically tune the performance of your containers.