docs: public LoggingFraction customFormatter(String name, String module, String className, Properties properties) {
          Map<Object, Object> formatterProperties = new HashMap<>();
          final Enumeration<?> names = properties.propertyNames();
          while (names.hasMoreElements()) {
              final String nextElement = (String) names.nextElement();
              formatterProperties.put(nextElement, properties.getProperty(nextElement));
          }
          customFormatter(new CustomFormatter(name)
                  .module(module)
                  .attributeClass(className)
                  .properties(formatterProperties));
          return this;
      }