code: @Override
      public Metric compare(String jsonModel1, String jsonModel2) throws JsonProcessingException, ApiException {
          LOG.debug("Compare models: model1: " + jsonModel1 + "  model: " + jsonModel2);
          return compareApi.compare("[ " + jsonModel1 + ", " + jsonModel2 + " ]", this.retinaName);
      }
docs: {@inheritDoc}