This is 1.23.0 gangnam release announcement for gRPC-Core and the wrapped 
languages C++, C#, Objective-C, Python, PHP and Ruby. Latest release notes 
are here.


Core
---

-  Backport #19924 to v1.23.x. 
([#19935](https://github.com/grpc/grpc/pull/19935))
-  Add missing APP callback context for custom iomgr. 
([#19687](https://github.com/grpc/grpc/pull/19687))
-  Increase lower bound on DNS re-resolution period to 30 seconds. 
([#19661](https://github.com/grpc/grpc/pull/19661))
-  Make sure there is at least a header in the frame storge of H2. 
([#19657](https://github.com/grpc/grpc/pull/19657))
-  Fix segfault when forking while using gevent. 
([#19556](https://github.com/grpc/grpc/pull/19556))
-  Mpmcqueue. ([#19358](https://github.com/grpc/grpc/pull/19358))
-  Disable the backup poller when using the background poller. 
([#19454](https://github.com/grpc/grpc/pull/19454))
-  Clearly callout the behavior for listening ports. 
([#19529](https://github.com/grpc/grpc/pull/19529))
-  Enable CFStream by default on  iOS. 
([#19439](https://github.com/grpc/grpc/pull/19439))
-  Fix DNS resolver cooldown. 
([#19489](https://github.com/grpc/grpc/pull/19489))
-  Simplify and fix c-ares TCP path on Windows. 
([#19397](https://github.com/grpc/grpc/pull/19397))
-   Modify codegen to use grpc_impl namespace and other cleanup. 
([#19435](https://github.com/grpc/grpc/pull/19435))

C++
---

-  Channel idleness. ([#19634](https://github.com/grpc/grpc/pull/19634))
-  Threadpool. ([#19544](https://github.com/grpc/grpc/pull/19544))
-  Bump min CMake to 3.5.1 to match Google benchmark. 
([#19467](https://github.com/grpc/grpc/pull/19467))
-  Migrate from dep.proto. to dep[ProtoInfo] provider. 
([#19420](https://github.com/grpc/grpc/pull/19420))

C#
---

-  Move ChannelExtensions (interceptor support) to Grpc.Core.Api (for 
v1.23.x branch). ([#19853](https://github.com/grpc/grpc/pull/19853))
-  Refactor ChannelCredentials and move to Grpc.Core.Api. 
([#19712](https://github.com/grpc/grpc/pull/19712))
-  C# bump major version to 2.x. 
([#19796](https://github.com/grpc/grpc/pull/19796))
-  Add ChannelBase, change ClientBase constructor argument. 
([#19599](https://github.com/grpc/grpc/pull/19599))
-  Remove System.Interactive.Async dependency. 
([#19059](https://github.com/grpc/grpc/pull/19059))
-  dont use shutdownRef count for sync completion queue. 
([#19629](https://github.com/grpc/grpc/pull/19629))
-  C# - remove delegate allocation and boxing from cancellation 
registrations. ([#19610](https://github.com/grpc/grpc/pull/19610))
-  csharp: Remove a double-box on Timespec. 
([#19525](https://github.com/grpc/grpc/pull/19525))
-  C#: add System.Memory dependency and use Span<> internally for all 
target frameworks . ([#19569](https://github.com/grpc/grpc/pull/19569))
-  csharp remove byte[] allocations during UTF8 encode/decode. 
([#19511](https://github.com/grpc/grpc/pull/19511))
-  csharp: remove AuthContext's Lazy<T> usage . 
([#19533](https://github.com/grpc/grpc/pull/19533))
-  csharp avoid capture-context in HandleNewServerRpc => HandleCallAsync. 
([#19526](https://github.com/grpc/grpc/pull/19526))
-  Make sure Grpc metapackage includes Grpc.Core.targets. 
([#19449](https://github.com/grpc/grpc/pull/19449))

Objective-C
---

-  ObjC experimental Bazel build support. 
([#19621](https://github.com/grpc/grpc/pull/19621))
-  Implement global interceptor. 
([#19322](https://github.com/grpc/grpc/pull/19322))

PHP
---

-  PHP: Fix missing addref in channel::constructor(). 
([#19737](https://github.com/grpc/grpc/pull/19737))

Python
---

-  Check call.trailing_metadata() for None before iterating it. 
([#19708](https://github.com/grpc/grpc/pull/19708))
-  Add a sanity check for the Python release process. 
([#19635](https://github.com/grpc/grpc/pull/19635))
-  Enforce a finite bound on the time gap between signal receipt and signal 
handler execution. ([#19481](https://github.com/grpc/grpc/pull/19481))
-  Python Compression Example. 
([#19421](https://github.com/grpc/grpc/pull/19421))

Ruby
---

-  Don't require_relative for an absolute path. 
([#19585](https://github.com/grpc/grpc/pull/19585))
-  Drop support for ruby < 2.3. 
([#19304](https://github.com/grpc/grpc/pull/19304))

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