public void trace(Marker marker, String format, Object arg1, Object arg2) {
        if (!logger.isTraceEnabled(marker))
            return;
        if (instanceofLAL) {
            ((LocationAwareLogger) logger).log(marker, fqcn, LocationAwareLogger.TRACE_INT, format, new Object[] { arg1, arg2 }, null);
        } else {
            logger.trace(marker, format, arg1, arg2);
        }
    }
Delegate to the appropriate method of the underlying logger.
slf4j-ext/src/main/java/org/slf4j/ext/LoggerWrapper.java