Appsignal.Transaction.set_error

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

set_error(name, message, backtrace)

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This function is deprecated. Use Appsignal.Span instead..
Link to this function

set_error(transaction, name, message, backtrace)

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This function is deprecated. Use Appsignal.Span instead..