v25.8 Changelog for Cloud

### Memory and resource management[​](#memory-and-resource-management "Direct link to Memory and resource management")

- Fix incorrect memory around `max_untracked_memory`. [#83607](https://github.com/ClickHouse/ClickHouse/pull/83607) ([Azat Khuzhin](https://github.com/azat)).
- Do not share `async_read_counters` between queries. [#83423](https://github.com/ClickHouse/ClickHouse/pull/83423) ([Azat Khuzhin](https://github.com/azat)).
- Fix possible file cache not initialized errors when it's used as a temporary data storage. [#83539](https://github.com/ClickHouse/ClickHouse/pull/83539) ([Bharat Nallan](https://github.com/bharatnc)).
- Always apply `filesystem_prefetches_limit` (not only from `MergeTreePrefetchedReadPool`). [#83999](https://github.com/ClickHouse/ClickHouse/pull/83999) ([Azat Khuzhin](https://github.com/azat)).

### Configuration and settings fixes[​](#configuration-and-settings-fixes "Direct link to Configuration and settings fixes")

- When passing settings over URI the last value is considered. [#82137](https://github.com/ClickHouse/ClickHouse/pull/82137) ([Sema Checherinda](https://github.com/CheSema)).
- Fix data-races in client (by not using global context) and `session_timezone` overrides (previously in case of `session_timezone` was set in i.e. `users.xml`/client options to non empty and in query context to empty, then, value from `users.xml` was used, while this is wrong, now query context will always have a priority over global context). [#82444](https://github.com/ClickHouse/ClickHouse/pull/82444) ([Azat Khuzhin](https://github.com/azat)).
- Disallow setting `threadpool_writer_pool_size` to zero to ensure that server operations don't get stuck. [#82532](https://github.com/ClickHouse/ClickHouse/pull/82532) ([Bharat Nallan](https://github.com/bharatnc)).
- Resolve minor integer overflow in configuration of setting `role_cache_expiration_time_seconds` (issue [#83374](https://github.com/ClickHouse/ClickHouse/issues/83374)). [#83461](https://github.com/ClickHouse/ClickHouse/pull/83461) ([wushap](https://github.com/wushap)).
- Disallow zero value for max\_insert\_block\_size as it could cause logical error. [#83688](https://github.com/ClickHouse/ClickHouse/pull/83688) ([Bharat Nallan](https://github.com/bharatnc)).
- Fix endless loop in `estimateCompressionRatio()` with block\_size\_bytes=0. [#83704](https://github.com/ClickHouse/ClickHouse/pull/83704) ([Azat Khuzhin](https://github.com/azat)).
- Parameters like `date_time_input_format` have been just ignored when http with multipart. [#85570](https://github.com/ClickHouse/ClickHouse/pull/85570) ([Sema Checherinda](https://github.com/CheSema)).

### MongoDB fixes[​](#mongodb-fixes "Direct link to MongoDB fixes")

- Previously, `MongoDB` table engine definitions could include a path component in the `host:port` argument which was silently ignored. The mongodb integration refuses to load such tables. With this fix *we allow loading such tables and ignore path component* if `MongoDB` engine has five arguments, using the database name from arguments. *Note:* The fix is not applied for newly created tables or queries with `mongo` table function, as well as for dictionary sources and named collections. [#81942](https://github.com/ClickHouse/ClickHouse/pull/81942) ([Vladimir Cherkasov](https://github.com/vdimir)).

### Miscellaneous fixes[​](#miscellaneous-fixes "Direct link to Miscellaneous fixes")