log/src/main/java/io/airlift/log/Logger.java
public void debug(Throwable exception, String message)
    {
        logger.log(FINE, message, exception);
    }
public void debug(Throwable exception, String message)
    {
        logger.log(FINE, message, exception);
    }
Logs a message at DEBUG level.

@param exception an exception associated with the debug message being logged
@param message a literal message to log