**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'
```
const String & replica, const ReplicatedMergeTreeLogEntryData & entry, bool wait_for_non_active)
{
    return waitForTableReplicaToProcessLogEntry(zookeeper_path, replica, entry, wait_for_non_active);
}
void StorageReplicatedMergeTree::getStatus(Status & res, bool with_zk_fields)
{
    auto zookeeper = tryGetZooKeeper();
    const auto storage_settings_ptr = getSettings();
    res.is_leader = is_leader;
    res.can_become_leader = storage_settings_ptr->replicated_can_become_leader;
    res.is_readonly = is_readonly;
    res.is_session_expired = !zookeeper || zookeeper->expired();
    res.queue = queue.getStatus();
    res.absolute_delay = getAbsoluteDelay(); 
    res.parts_to_check = part_check_thread.size();
    res.zookeeper_path = zookeeper_path;
    res.replica_name = replica_name;
    res.replica_path = replica_path;
    res.columns_version = -1;
    res.log_max_index = 0;
    res.log_pointer = 0;
    res.total_replicas = 0;
    res.active_replicas = 0;
    if (with_zk_fields && !res.is_session_expired)
    {
        try
        {