Statistics
https://play.clickhouse.com/play?user=play#c2VsZWN0IAp0b1N0YXJ0T2ZIb3VyKGNoZWNrX3N0YXJ0X3RpbWUpIGFzIGQsCmNvdW50KCksICBncm91cFVuaXFBcnJheShwdWxsX3JlcXVlc3RfbnVtYmVyKSwgIGFueShyZXBvcnRfdXJsKQpmcm9tIGNoZWNrcyB3aGVyZSAnMjAyMi0wNi0wMScgPD0gY2hlY2tfc3RhcnRfdGltZSBhbmQgdGVzdF9uYW1lIGxpa2UgJyUwMjQ5MV9wYXJ0X2xvZ19oYXNfdGFibGVfdXVpZCUnIGFuZCB0ZXN0X3N0YXR1cyBpbiAoJ0ZBSUwnLCAnRkxBS1knKSBncm91cCBieSBkIG9yZGVyIGJ5IGQgZGVzYw==

Some times there are not output from requests.
{
    total_active_size_bytes.fetch_add(bytes, std::memory_order_acq_rel);
    total_active_size_rows.fetch_add(rows, std::memory_order_acq_rel);
    total_active_size_parts.fetch_add(parts, std::memory_order_acq_rel);
}
void MergeTreeData::setDataVolume(size_t bytes, size_t rows, size_t parts)
{
    total_active_size_bytes.store(bytes, std::memory_order_release);
    total_active_size_rows.store(rows, std::memory_order_release);
    total_active_size_parts.store(parts, std::memory_order_release);
}
bool MergeTreeData::insertQueryIdOrThrow(const String & query_id, size_t max_queries) const
{
    std::lock_guard lock(query_id_set_mutex);
    return insertQueryIdOrThrowNoLock(query_id, max_queries);
}
bool MergeTreeData::insertQueryIdOrThrowNoLock(const String & query_id, size_t max_queries) const
{
    if (query_id_set.find(query_id) != query_id_set.end())
        return false;
    if (query_id_set.size() >= max_queries)
        throw Exception(
            ErrorCodes::TOO_MANY_SIMULTANEOUS_QUERIES,
            "Too many simultaneous queries for table {}. Maximum is: {}",
            *std::atomic_load(&log_name),
            max_queries);
    query_id_set.insert(query_id);
    return true;
}
void MergeTreeData::removeQueryId(const String & query_id) const