private String mergeMarkersAndKeyValuePairsAndMessage(LoggingEvent aLoggingEvent) {
        StringBuilder sb = mergeMarkers(aLoggingEvent.getMarkers(), null);
        sb = mergeKeyValuePairs(aLoggingEvent.getKeyValuePairs(), sb);
        final String mergedMessage = mergeMessage(aLoggingEvent.getMessage(), sb);
        return mergedMessage;
    }
Prepend markers and key-value pairs to the message.

@param aLoggingEvent

@return
slf4j-api/src/main/java/org/slf4j/spi/DefaultLoggingEventBuilder.java