**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'
```
{
            LOG_ERROR(log, "Not found active replica having part {}", part_name);
            enqueuePartForCheck(part_name);
        }
    }
    for (auto & future : enqueue_futures)
        future.get();
    
    for (const DataPartPtr & part : unexpected_parts)
    {
        LOG_ERROR(log, "Renaming unexpected part {} to ignored_{}", part->name, part->name);
        forgetPartAndMoveToDetached(part, "ignored", true);
    }
}
void StorageReplicatedMergeTree::syncPinnedPartUUIDs()
{
    auto zookeeper = getZooKeeper();
    Coordination::Stat stat;
    String s = zookeeper->get(zookeeper_path + "/pinned_part_uuids", &stat);
    std::lock_guard lock(pinned_part_uuids_mutex);
    
    if (pinned_part_uuids->stat.version < stat.version)
    {
        auto new_pinned_part_uuids = std::make_shared<PinnedPartUUIDs>();
        new_pinned_part_uuids->fromString(s);
        new_pinned_part_uuids->stat = stat;
        pinned_part_uuids = new_pinned_part_uuids;
    }
}
void StorageReplicatedMergeTree::checkPartChecksumsAndAddCommitOps(const zkutil::ZooKeeperPtr & zookeeper,