gRPC-Core Release 1.60.0

[Mark D. Roth]

This is the 1.60.0 (gjallarhorn) release announcement for gRPC-Core and the wrapped languages C++, Objective-C, Python, PHP and Ruby. Latest release notes are here.

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

Core

• Implemented dualstack IPv4 and IPv6 backend support, as per draft gRFC A61. xDS support currently guarded by GRPC_EXPERIMENTAL_XDS_DUALSTACK_ENDPOINTS env var.
• Dropped Bazel 5 support. (#34813)
• [deps] Upgrade protobuf version to v25.0. (#34513)
• [Security - Revocation] Crl Directory Watcher Implementation. (#34749)
• [server] Cap size of pending request queue with RealRequestMatcher. (#34782)
• [chttp2] Fix outgoing data stats. (#34693)
• [EventEngine] Enable Posix EventEngine Listener on all builds. (#34748)
• [EventEngine] Enable Windows EventEngine Listener on all builds. (#34436)
• [chttp2] Alternative protection for too many streams in the system. (#34697)
• [Proxy] Support for setting proxy for addresses. (#34617)
• [client idleness] client channels go idle after 30 minutes by default. (#34653)
• [chttp2] Add an experiment to separate liveness checks from ping timeouts. (#34647)
• [chttp2] Tarpit invalid requests. (#34641)
• [chttp2] Enforce settings acks. (#34640)
• [chttp2] Limit work per read cycle. (#34639)
• [chttp2] Limit request count before receiving settings ack. (#34638)
• [chttp2] Randomly ping on RST_STREAM. (#34637)

C++

• [xds] C++ XdsServerBuilder Remove src/... header dependency from public header. (#34790)
• [reflection] Add v1 reflection. (#34535)

C#

• [csharp] Grpc.Tools documentation for sharing proto files between projects and nuget packages. (#34521)

Ruby

• [ruby] create debug symbol packages. (#34632)