root@host:~# radosgw-admin reshard list
[
    {
        "time": "2020-07-21 10:52:34.394868Z",
        "tenant": "XXX",
        "bucket_name": "YYY",
        "bucket_id": "xxx.2194944.2628",
        "new_instance_id": "YYY:XXX.2910984.1",
        "old_num_shards": 128,
        "new_num_shards": 256
    }
]