**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'
```
for (auto & part : parts_to_delete_completely)
    {
        if (part_names_to_retry_deletion.count(part->name) == 0)
            parts_to_remove_from_filesystem.emplace_back(part);
        else
            parts_to_retry_deletion.emplace_back(part);
    }
    
    if (!parts_to_retry_deletion.empty())
    {
        rollbackDeletingParts(parts_to_retry_deletion);
        LOG_DEBUG(log, "Will retry deletion of {} parts in the next time", parts_to_retry_deletion.size());
    }
    
    if (!parts_to_remove_from_filesystem.empty())
    {
        clearPartsFromFilesystem(parts_to_remove_from_filesystem);
        removePartsFinally(parts_to_remove_from_filesystem);
        LOG_DEBUG(log, "Removed {} old parts", parts_to_remove_from_filesystem.size());
    }
}
bool StorageReplicatedMergeTree::tryRemovePartsFromZooKeeperWithRetries(DataPartsVector & parts, size_t max_retries)
{
    Strings part_names_to_remove;
    for (const auto & part : parts)
        part_names_to_remove.emplace_back(part->name);
    return tryRemovePartsFromZooKeeperWithRetries(part_names_to_remove, max_retries);
}
bool StorageReplicatedMergeTree::tryRemovePartsFromZooKeeperWithRetries(const Strings & part_names, size_t max_retries)