Erlang Solutions: Guess Less with Erlang Doctor
BEAM languages, such as Erlang and Elixir, offer a powerful tracing mechanism, and Erlang Doctor is built on top of it. It stores function calls and messages in an ETS table, which lowers the impact on the traced system, and enables querying and analysis of the collected traces. Being simple, always available and easy to use, it encourages you to pragmatically investigate system logic rather than guess about the reason for its behaviour.

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