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    error_logger is also important to look at. It provides a common way of getting access to all errors, log messages, or warnings provided by any conforming application.

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      if you intend on actually using any of these tools in anger, then you will definitely also want to read https://www.erlang-in-anger.com/ (a free pdf ebook), which has a load of useful information on the underlying substrate as well as walk-throughs on many important tools.