code: public void trace(String correlationId, String message, Object... args) {
  		formatAndWrite(LogLevel.Trace, correlationId, null, message, args);
  	}
docs: Logs a low-level debug information for troubleshooting.
  
  @param correlationId (optional) transaction id to trace execution through
  call chain.
  @param message       a human-readable message to log.
  @param args          arguments to parameterize the message.