docs: public static <T> Optional<T> findStatisticOnDescendants(Object context, String tag, String statName) {
  
      @SuppressWarnings("unchecked")
      Set<TreeNode> statResult = queryBuilder()
        .descendants()
        .filter(context(attributes(Matchers.allOf(
          hasAttribute("name", statName),
          hasTag(tag)))))
        .build().execute(Collections.singleton(ContextManager.nodeFor(context)));
  
      if (statResult.size() > 1) {
        throw new RuntimeException("One stat expected for " + statName + " but found " + statResult.size());
      }
  
      if (statResult.size() == 1) {
        @SuppressWarnings("unchecked")
        T result = (T) statResult.iterator().next().getContext().attributes().get("this");
        return Optional.ofNullable(result);
      }
  
      // No such stat in this context
      return Optional.empty();
    }