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feat docs: changelog 2.16
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‎scripts/docs/en/userver/roadmap_and_changelog.md‎

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## Changelog
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### Release v2.16
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* **Support of C++17 is deprecated and will be removed in one on the next releases**. C++20 is the default for
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userver for quite some time. Use C++20 or even a more modern C++.
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* New readiness notification flow for tasks, futures, events and other awaitable objects. It provides a lightweight and
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efficient framework for more efficient implementation of waiting objects/methods like @ref engine::WaitAny,
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@ref engine::FdPoller, @ref engine::TaskBase::BlockingWait .
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* Ydb: @ref ydb::Transaction and @ref ydb::TableClient::ExecuteDataQuery switched from Table Client to Query Client API.
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* Multicast support for sockets. See @ref engine::io::IpMreq .
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Many thanks to [Dmitry Borchuk](https://github.com/dmitryborchuk) for the contribution!
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* SAX parsing in Chaotic codegen. See @ref scripts/docs/en/userver/chaotic.md .
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* HttpClient: New Websocket client. See @ref scripts/docs/en/userver/tutorial/websocket_client.md .
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* gRPC: Retry limiter. See @ref ugrpc::client::RetryLimiter .
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* Separate log for components loading that simplifies components loading issues debugging.
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See `components_manager.boot-log-path` in @ref components::ManagerControllerComponent .
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* Redis: Valkey and Redis dynamic client component. See @ref components::DynamicRedis .
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* @ref components::StatisticsStorage allows filtering of metrics by @ref utils::statistics::MetricTag .
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* Automatic conversions between structs and JSON in `easy` library. See @ref scripts/docs/en/userver/libraries/easy.md .
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* Resource scopes separated from the component system. See @ref utils::ResourceScopeStorage .
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* New @ref multi_index_lru::ExpirableContainer container. Many thanks to [hzhdlrp](https://github.com/hzhdlrp)
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for the contribution!
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* Kafka: Added `group_instance_id` option to @ref kafka::ConsumerComponent .
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* gRPC: Perform retry on the next channel.
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* Ydb: New transaction modes support. See @ref ydb::TransactionMode .
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* Ydb: New AsContainer() method in cursor. See @ref ydb::Cursor::AsContainer .
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* Redis: New @ref storages::redis::Client::EvalReadOnly and @ref storages::redis::Client::EvalShaReadOnly functions.
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* Per-handler metrics in HTTP server. See `SetHandlerMetricsShard` in @ref server::request::RequestContext .
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* gRPC: Extended gRPC client completion statuses. See @ref ugrpc::client::SpecialCaseCompletionType .
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* `operator==` for proto structs.
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* Userver can listen on a socket passed via `execve`. See `listen-socket-fd` parameter description in
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@ref components::Server .
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* New `contains_no_update` method in @ref multi_index_lru::Container and benchmarks cleanup.
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Many thanks to [hzhdlrp](https://github.com/hzhdlrp) for the contribution!
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* New @ref net::blocking::ConnectTcpByName method to connect to a remote endpoint via a host name and a port.
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* Converters between proto structs and binary data. See @ref userver/proto-structs/convert.hpp .
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* Converters between proto structs and JSON. See @ref userver/proto-structs/json.hpp .
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* Converters between proto structs enums and strings.
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* @ref server::websocket::WebSocketConnection support for waiting primitives (like @ref engine::MakeWaitAny ).
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* Added @ref engine::io::Sockaddr::MakeIPSocketAddress, @ref engine::io::Sockaddr::MakeInaddrAny and
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@ref engine::io::Sockaddr::MakeIPv4InaddrAny functions.
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Many thanks to [Dmitry Borchuk](https://github.com/dmitryborchuk) for the contribution!
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* Optimizations and fixes
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* New @ref engine::WaitAnyContext (@ref engine::MakeWaitAny ) and @ref engine::WaitAllChecked waiting primitives
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optimized for usage in loops.
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* Kafka: Reuse consumer after a user exception.
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* Redis: Optimized statistics storage - removed most of per-shard and per-instance statistics that are rarely used
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to save memory, CPU and network bandwidth.
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* Prevent an unnecessary copy inside the `ServerImpl::WriteTotalHandlerStatistics` function.
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Many thanks to [gabrielyanabraham](https://github.com/gabrielyanabraham) for the PR!
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* Optimized @ref engine::TaskBase::BlockingWait .
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* Kafka: Deprecated @ref engine::WaitAny replaced with @ref engine::MakeWaitAny .
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Many thanks to [Dmitry Isaikin](https://github.com/disaykin) for the PR!
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* Fixed @ref yaml_config::YamlConfig mode when accessing an array by index.
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Many thanks to [Fedor Shatokhin](https://github.com/FedShat) for the contribution!
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* Fixed compilation error with modern `libfmt` versions. Many thanks to
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[Konstantin Goncharik](https://github.com/botanegg) for the PR!
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* Fixed -flto=auto support for GCC. Many thanks to [Konstantin Goncharik](https://github.com/botanegg)
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for the PR!
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* Fixed broken `journal_mode` and `synchronous` options definitions in @ref components::SQLite .
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Many thanks to [Alexey Mednyy](https://github.com/swex) for the PR!
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* Fixed a compile warning in @ref utils::PeriodicTask .
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Many thanks to [Evgeny Proydakov](https://github.com/proydakov) for the PR!
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* HttpClient: Fixed socket type equality check. Many thanks to [Konstantin Goncharik](https://github.com/botanegg)
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for the PR!
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* Ydb: Fixed compilation error with modern `libfmt` versions.
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Many thanks to [Vasily Sviridov](https://github.com/vasily-sviridov) for the PR!
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* Build and testing
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* Updated Google benchmark to 1.9.5. Many thanks to [Konstantin Goncharik](https://github.com/botanegg) for the PR!
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* Userver devcontainer. See @ref scripts/docs/en/userver/build/userver.md#devcontainers_userver .
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* New `component_manager.coro_pool.unoptimized_stack_size_multiplier` option to automatically increase stack size
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in unoptimized builds. See @ref components::ManagerControllerComponent .
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* gRPC: @ref @ref pytest_userver.grpc._client.PreCallClientInterceptor accessible from testsuite.
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* New @ref utils::StartPeriodicTask method that allows deterministic testing of periodic tasks in testsuite.
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* Upgraded CPM.cmake to 0.42.1. Many thanks to [Konstantin Goncharik](https://github.com/botanegg) for the PR!
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* Documentation
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* Better documentation and benchmark for LRU caches.
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* Markdown documentation for cmake files.
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* Postgres: Updated connections limit documentation. See @ref scripts/docs/en/userver/pg_connlimit_mode_auto.md .
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* Extra samples for metrics unit testing.
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* Updated @ref engine::SingleUseEvent and @ref engine::SingleConsumerEvent documentation.
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* gRPC: @ref ugrpc::RichStatus documentation. See @ref scripts/docs/en/userver/grpc/rich_status.md .
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* Added missing include to @ref README.md. Many thanks to [Aleksey Belov](https://github.com/belov-aleksey) for the PR!
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* Updated Gentoo build docs. Many thanks to [halfdarkangel](https://github.com/halfdarkangel) for the contribution!
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* Detailed description of Congestion Control logic. See @ref scripts/docs/en/userver/congestion_control.md .
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* Kafka: Added `pool_timeout` to kafka-consumer config in @ref samples/kafka_service/static_config.yaml .
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Many thanks to [Konstantin Goncharik](https://github.com/botanegg) for the PR!
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### Release v2.15
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* **Support of C++17 is deprecated and will be removed in one on the next releases**. C++20 is the default for

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