**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::shuffle(replicas.begin(), replicas.end(), thread_local_rng);
    String largest_part_found;
    String largest_replica_found;
    for (const String & replica : replicas)
    {
        if (replica == replica_name)
            continue;
        if (active && !zookeeper->exists(fs::path(zookeeper_path) / "replicas" / replica / "is_active"))
            continue;
        Strings parts = zookeeper->getChildren(fs::path(zookeeper_path) / "replicas" / replica / "parts");
        for (const String & part_on_replica : parts)
        {
            if (part_on_replica == part_name
                || MergeTreePartInfo::contains(part_on_replica, part_name, format_version))
            {
                if (largest_part_found.empty()
                    || MergeTreePartInfo::contains(part_on_replica, largest_part_found, format_version))
                {
                    largest_part_found = part_on_replica;
                    largest_replica_found = replica;
                }
            }
        }
    }
    found_part_name = largest_part_found;
    return largest_replica_found;
}
/** If a quorum is tracked for a part, update information about it in ZK.
  */
void StorageReplicatedMergeTree::updateQuorum(const String & part_name, bool is_parallel)