marker.getName();
if(marker instanceof FoundationLoggingMarker){
FoundationLoggingMarker foundationLoggingMarker = (FoundationLoggingMarker)marker;
String userFieldValue = foundationLoggingMarker.valueOf(key);
if(FoundationLoggingMarker.NO_OPERATION.equals(userFieldValue)){
toAppendTo.append("");
}else{
toAppendTo.append(userFieldValue);
}