v1.57.0

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This is release 1.57.0 (grounded) of gRPC Core.

For gRPC documentation, seegrpc.io. For previous releases, seeReleases.

This release contains refinements, improvements, and bug fixes, with highlights listed below.

Core

• [EventEngine] ChangeGetDNSResolver to returnabsl::StatusOr<std::unique_ptr<DNSResolver>>. (#​33744)
• [deps] Remove libuv dependency. (#​33748)
• [ssl] Fix SSL stack to handle large handshake messages whose length exceeds the BIO buffer size. (#​33638)
• [BoringSSL] Update third_party/boringssl-with-bazel. (#​33690)
• [iomgr][EventEngine] Improve server handling of file descriptor exhaustion. (#​33656)
• [ruby] experimental client side fork support. (#​33430)
• [core] Add a channel argument to set DSCP on streams. (#​28322)
• [xDS LB] xDS pick first support. (#​33540)
• [tls] Remove use of SSL_CTX_set_client_CA_list for TLS server credentials. (#​33558)
• [EventEngine] SimplifyEventEngine::DNSResolver API. (#​33459)
• [iomgr][Windows] Return proper error code to client when connection is reset. (#​33502)
• [fork] simplify Fork::SetResetChildPollingEngineFunc to fix nested forking. (#​33495)
• [lb pick_first] Enable random shuffling of address list. (#​33254)
• [HTTP2] Fix inconsistencies in keepalive configuration. (#​33428)
• [c-ares] Upgrade c-ares dependency to 1.19.1. (#​33392)
• [Rls] de-experimentalize RLS in XDS. (#​33290)

C++

• [otel] Add bazel dependency. (#​33548)

C#

• [csharp] Include correct build of Grpc.Tools in nightly packages. (#​33595)
• [csharp] reintroduce base_namespace experimental option to C# (with a patch). (#​33535)

Objective-C

• [Protobuf] Upgrade third_party/protobuf to 23.4. (#​33695)

Python

• [posix] Enable systemd sockets for libsystemd>=233. (#​32671)
• [python O11Y] Initial Implementation. (#​32974)

Ruby

• [ruby] experimental client side fork support (#​33430)
• [ruby] backport "[ruby] remove unnecessary background thread startup wait logic that interferes with forking#​33805" to v1.57.x. (#​33846)
• [Ruby] remove manual strip in ruby ext conf. (#​33641)
• [ruby] simplify shutdown; remove unnecessary attempts at grpc_shutdown. (#​33674)
• [ruby] Add-weak_framework CoreFoundation to link line. (#​33538)
• [Ruby] Fix memory leak in grpc_rb_call_run_batch. (#​33368)
• [Ruby] Fix memory leak in grpc_rb_server_request_call. (#​33371)