docs: @SuppressWarnings("unchecked")
      public <T, E> RingbufferContainer<T, E> getContainerOrNull(int partitionId, ObjectNamespace namespace) {
          final Map<ObjectNamespace, RingbufferContainer> partitionContainers = containers.get(partitionId);
          return partitionContainers != null ? partitionContainers.get(namespace) : null;
      }