**Use case**

Currently, `system.replicas` table has `total_replicas` and `active_replicas` columns which are useful to check/alert when some replicas are down. One problem, these columns are numbers. They tell when there is a problem, but you need to further check ZooKeeper or query all the nodes to detect what exact replicas (hosts) are down/inactive/have problems.

**Describe the solution you'd like**

Add a replicas column maybe as a map which would contain the replica name, and it's status. Or, add 2 array columns with `replica_names` and `active_replica_names`

**Alternative**

Something along the line

```sql
select path, value from system.zookeeper where path IN (
    select concat(path, '/', name) from system.zookeeper where path in (select concat(zookeeper_path, '/replicas') from system.replicas)
)
and name = 'is_active'
```
}
    }
    if (!has_been_already_added)
    {
        const auto storage_settings_ptr = getSettings();
        String part_path = fs::path(replica_path) / "parts" / part_name;
        
        
        if (storage_settings_ptr->use_minimalistic_part_header_in_zookeeper)
        {
            ops.emplace_back(zkutil::makeCreateRequest(
                part_path, local_part_header.toString(), zkutil::CreateMode::Persistent));
        }
        else
        {
            ops.emplace_back(zkutil::makeCreateRequest(
                part_path, "", zkutil::CreateMode::Persistent));
            ops.emplace_back(zkutil::makeCreateRequest(
                fs::path(part_path) / "columns", part->getColumns().toString(), zkutil::CreateMode::Persistent));
            ops.emplace_back(zkutil::makeCreateRequest(
                fs::path(part_path) / "checksums", getChecksumsForZooKeeper(part->checksums), zkutil::CreateMode::Persistent));
        }
    }
    else
    {
        LOG_WARNING(log, "checkPartAndAddToZooKeeper: node {} already exists. Will not commit any nodes.",
                    (fs::path(replica_path) / "parts" / part_name).string());
    }
}
MergeTreeData::DataPartsVector StorageReplicatedMergeTree::checkPartChecksumsAndCommit(Transaction & transaction,