**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'
```
String from = extractZooKeeperPath(expand_from);
    if (from.empty())
        throw Exception("ZooKeeper path should not be empty", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
    zkutil::ZooKeeperPtr zookeeper;
    if (auxiliary_zookeeper_name != default_zookeeper_name)
        zookeeper = getContext()->getAuxiliaryZooKeeper(auxiliary_zookeeper_name);
    else
        zookeeper = getZooKeeper();
    if (from.back() == '/')
        from.resize(from.size() - 1);
    if (fetch_part)
    {
        String part_name = partition->as<ASTLiteral &>().value.safeGet<String>();
        auto part_path = findReplicaHavingPart(part_name, from, zookeeper);
        if (part_path.empty())
            throw Exception(ErrorCodes::NO_REPLICA_HAS_PART, "Part {} does not exist on any replica", part_name);
        /** Let's check that there is no such part in the `detached` directory (where we will write the downloaded parts).
          * Unreliable (there is a race condition) - such a part may appear a little later.
          */
        if (checkIfDetachedPartExists(part_name))
            throw Exception(ErrorCodes::DUPLICATE_DATA_PART, "Detached part " + part_name + " already exists.");
        LOG_INFO(log, "Will fetch part {} from shard {} (zookeeper '{}')", part_name, from_, auxiliary_zookeeper_name);
        try
        {
            
            if (!fetchPart(part_name, metadata_snapshot, part_path, true, 0, zookeeper))
                throw Exception(ErrorCodes::UNFINISHED, "Failed to fetch part {} from {}", part_name, from_);
        }
        catch (const DB::Exception & e)
        {