**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'
```
}
        else if (code == Coordination::Error::ZBADVERSION)
        {
            
            continue;
        }
        else
            throw Coordination::Exception(code, quorum_last_part_path);
    }
}
bool StorageReplicatedMergeTree::partIsInsertingWithParallelQuorum(const MergeTreePartInfo & part_info) const
{
    auto zookeeper = getZooKeeper();
    return zookeeper->exists(fs::path(zookeeper_path) / "quorum" / "parallel" / part_info.getPartName());
}
bool StorageReplicatedMergeTree::partIsLastQuorumPart(const MergeTreePartInfo & part_info) const
{
    auto zookeeper = getZooKeeper();
    const String parts_with_quorum_path = fs::path(zookeeper_path) / "quorum" / "last_part";
    String parts_with_quorum_str = zookeeper->get(parts_with_quorum_path);
    if (parts_with_quorum_str.empty())
        return false;
    ReplicatedMergeTreeQuorumAddedParts parts_with_quorum(format_version);
    parts_with_quorum.fromString(parts_with_quorum_str);
    auto partition_it = parts_with_quorum.added_parts.find(part_info.partition_id);
    if (partition_it == parts_with_quorum.added_parts.end())
        return false;
    return partition_it->second == part_info.getPartName();
}
bool StorageReplicatedMergeTree::fetchPart(const String & part_name, const StorageMetadataPtr & metadata_snapshot,