private static String annotationKeyPairToString(Pair<AnnotationKey> pair) {
        return pair.value.getName() + "(" + pair.value.getCode() + ") from " + pair.provider.toString();
    }
@author Jongho Moon
@author HyunGil Jeong
commons-profiler/src/main/java/com/navercorp/pinpoint/common/profiler/trace/TraceMetadataLoader.java