Have you heard your colleagues discussing for weeks why your product is so slow? Did everyone have different components under suspicion? Did you sit in front of a project consisting of tens of thousands of lines of code and tried to pin down the bottle necks? Don't want to use proprietary services like New Relic APM or XRebel? In this presentation we will have a closer look on how to make visible what is inside your Java monolith with Hystrix by Netflix. After an overview is given, I will show how we implemented Hystrix into oVirt to hunt down bottle necks and architectural problems.