def METHOD_NAME(self, key, batch_size, _=None):
    """
    FIXME: This has a bug with historical metrics. The `max_query_metrics` parameter on vcenter side limits
    the number of metrics that are queryable in the same request. The `mors_batch` method fixes that issue but is
    not yet enabled by default.
    Generator returning as many dictionaries containing `batch_size` Mor
    objects as needed to iterate all the content of the cache. This has
    to be iterated twice, like:
        for batch in cache.mors_batch('key', 100):
            for name, mor in batch:
                # use the Mor object here
    """
    with self._mor_lock:
        mors_dict = self._mor.get(key)
        if mors_dict is None:
            yield {}
        mor_names = list(mors_dict)
        mor_names.sort()
        total = len(mor_names)
        for idx in range(0, total, batch_size):
            names_chunk = mor_names[idx : min(idx + batch_size, total)]
            yield {name: mors_dict[name] for name in names_chunk}