class SemanticLogger::Appender::Wrapper

def log(log)

Ruby or Rails Loggers
trace entries are mapped to debug since :trace is not supported by the
Pass log calls to the underlying Rails, log4j or Ruby logger 
def log(log)
  level = log.level == :trace ? :debug : log.level
  @logger.send(level, formatter.call(log, self))
  true
end