Tracing and debugging large systems still remains a challenging and sometimes daunting task. There are few tools at hand, and even if some data is collected the sheer volume and hours required to analyse it makes one wince. However, there's a hidden gem in OTP which many developers and testers may not be aware of - the Inviso application, providing support for setting up and collecting real-time tracing in multi-node environments. Although still a work in progress, we've made an effort to provide a clean, functional and safe API to it. Together with a friendlier user-interface it is getting ready to assist developers who are building massively distributed systems.

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