@Override
    public Set<String> getContextLabels() {
        final Set<String> labels = new HashSet<>();
        for (final Pair<String, Object> pair : contextValues) {
            labels.add(pair.getKey());
        }
        return labels;
    }
@ Override public Set < String > getContextLabels ( ) { final Set < String > labels = new HashSet < > ( ) ; for ( final Pair < String , Object > pair : contextValues ) { labels . add ( pair . getKey ( ) ) ; } return labels ; }
{@inheritDoc}