**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 (throw_if_noop)
                throw Exception("Part " + part_name
                                + " is currently participating in a background operation (mutation/merge)"
                                + ", try again later", ErrorCodes::PART_IS_TEMPORARILY_LOCKED);
            return false;
        }
        if (partIsLastQuorumPart(part->info))
        {
            if (throw_if_noop)
                throw Exception("Part " + part_name + " is last inserted part with quorum in partition. Cannot drop",
                                ErrorCodes::NOT_IMPLEMENTED);
            return false;
        }
        if (partIsInsertingWithParallelQuorum(part->info))
        {
            if (throw_if_noop)
                throw Exception("Part " + part_name + " is inserting with parallel quorum. Cannot drop",
                                ErrorCodes::NOT_IMPLEMENTED);
            return false;
        }
        Coordination::Requests ops;
        getClearBlocksInPartitionOps(ops, *zookeeper, part_info.partition_id, part_info.min_block, part_info.max_block);
        size_t clear_block_ops_size = ops.size();
        
        
        entry.type = LogEntry::DROP_RANGE;
        entry.source_replica = replica_name;