Ruby's TracePoint API lets developers trace program events without modifying source code

A developer discovered Ruby's TracePoint class while investigating cryptic warnings appearing on a CI pipeline. TracePoint is a built-in Ruby API that enables instrumentation of key program events such as method calls, raises, and block entries. It allows developers to trace specific events — like pinpointing where a particular method is called — without altering the original defining code. In a simple example, TracePoint can intercept a method call and return details such as line number, class, method name, and event type. Beyond debugging, the API could potentially be leveraged for advanced metaprogramming patterns in Ruby frameworks.