**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'
```
{
    std::optional<ReplicatedMergeTreeQuorumAddedParts::PartitionIdToMaxBlock> max_added_blocks = {};
    /**
     * Synchronously go to ZooKeeper when select_sequential_consistency enabled
     */
    if (select_sequential_consistency)
        max_added_blocks = getMaxAddedBlocks();
    auto lock = lockParts();
    for (const auto & part : getDataPartsStateRange(DataPartState::Committed))
    {
        if (part->isEmpty())
            continue;
        if (max_added_blocks)
        {
            auto blocks_iterator = max_added_blocks->find(part->info.partition_id);
            if (blocks_iterator == max_added_blocks->end() || part->info.max_block > blocks_iterator->second)
                continue;
        }
        func(part);
    }
}
std::optional<UInt64> StorageReplicatedMergeTree::totalRows(const Settings & settings) const