Appsignal.set_error

You're seeing just the function set_error, go back to Appsignal module for more information.
Link to this function

set_error(exception, stacktrace)

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See Appsignal.Instrumentation.set_error/2.

Link to this function

set_error(kind, reason, stacktrace)

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See Appsignal.Instrumentation.set_error/3.