**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'
```
entry.detach = detach;
    entry.create_time = time(nullptr);
    Coordination::Requests ops;
    ops.emplace_back(zkutil::makeCreateRequest(fs::path(zookeeper_path) / "log/log-", entry.toString(),
        zkutil::CreateMode::PersistentSequential));
    
    
    
    ops.emplace_back(zkutil::makeCheckRequest(alter_partition_version_path, alter_partition_version_stat.version));
    ops.emplace_back(zkutil::makeSetRequest(alter_partition_version_path, "", -1));
    
    ops.emplace_back(zkutil::makeSetRequest(fs::path(zookeeper_path) / "log", "", -1));
    delimiting_block_lock->getUnlockOps(ops);
    if (auto txn = query_context->getZooKeeperMetadataTransaction())
        txn->moveOpsTo(ops);
    Coordination::Responses responses;
    Coordination::Error code = zookeeper.tryMulti(ops, responses);
    if (code == Coordination::Error::ZOK)
        delimiting_block_lock->assumeUnlocked();
    else if (code == Coordination::Error::ZBADVERSION)
        throw Exception(ErrorCodes::CANNOT_ASSIGN_ALTER,
            "Cannot assign ALTER PARTITION because another ALTER PARTITION query was concurrently executed");
    else
        zkutil::KeeperMultiException::check(code, ops, responses);
    String log_znode_path = dynamic_cast<const Coordination::CreateResponse &>(*responses.front()).path_created;
    entry.znode_name = log_znode_path.substr(log_znode_path.find_last_of('/') + 1);
    getContext()->getMergeList().cancelInPartition(getStorageID(), partition_id, drop_range_info.max_block);
    return true;
}
CheckResults StorageReplicatedMergeTree::checkData(const ASTPtr & query, ContextPtr local_context)