Did you know that the Java Virtual Machine comes with a built-in high quality performance and diagnostic tool that has almost zero overhead? Come learn about the JDK Flight Recorder (JFR), a tool that provides high quality diagnostic and performance information about what’s going on inside the JVM and your code. We’ll go over what JFR is, how to use it, and work through several live examples. By the end of this talk, you’ll know how to use JFR to help solve performance problems, debug your code, and how to add your own metrics.