**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'
```
catch (const Coordination::Exception & e)
    {
        if (parts_should_be_retried && Coordination::isHardwareError(e.code))
            parts_should_be_retried->insert(part_names.begin(), part_names.end());
        throw;
    }
    for (size_t i = 0; i < remove_futures.size(); ++i)
    {
        auto & future = remove_futures[i];
        if (!future.valid())
            continue;
        auto response = future.get();
        if (response.error == Coordination::Error::ZOK)
            continue;
        else if (response.error == Coordination::Error::ZNONODE)
        {
            LOG_DEBUG(log, "There is no part {} in ZooKeeper, it was only in filesystem", part_names[i]);
            continue;
        }
        else if (Coordination::isHardwareError(response.error))
        {
            if (parts_should_be_retried)
                parts_should_be_retried->insert(part_names[i]);
            continue;
        }
        else
            LOG_WARNING(log, "Cannot remove part {} from ZooKeeper: {}", part_names[i], Coordination::errorMessage(response.error));
    }
}
void StorageReplicatedMergeTree::getClearBlocksInPartitionOps(