This is 1.27.0 (guantao) release announcement for gRPC-Core and the wrapped 
languages C++, C#, Objective-C, Python, PHP and Ruby. Latest release notes 
are here <https://github.com/grpc/grpc/releases/tag/v1.27.0>.
Core
   
   - fix build with OpenSSL1.1.1+ on Windows. (#21611 
   <https://github.com/grpc/grpc/pull/21611>)
   - Add a new submodule libuv v1.34.0. (#21583 
   <https://github.com/grpc/grpc/pull/21583>)
   - grpclb: Add support for balancer telling client to enter fallback 
   mode. (#21452 <https://github.com/grpc/grpc/pull/21452>)
   - Bare bones of the libuv EventManager. (#21216 
   <https://github.com/grpc/grpc/pull/21216>)
   - Allow default use of system root certs on Android. (#21395 
   <https://github.com/grpc/grpc/pull/21395>)

C++
   
   - Backport: Fix regression in MSVC runtime flag (for v1.27.x). (#21810 
   <https://github.com/grpc/grpc/pull/21810>)
   - Add Support for Full Chain Callbacks - experimental namespace. (#21423 
   <https://github.com/grpc/grpc/pull/21423>)
   - Improve documentation for building with CMake. (#21529 
   <https://github.com/grpc/grpc/pull/21529>)
   - Conditionally enable OPENSSL_NO_ASM for Visual Studio. (#21427 
   <https://github.com/grpc/grpc/pull/21427>)
   - Allow gRPC_INSTALL with module providers. (#21411 
   <https://github.com/grpc/grpc/pull/21411>)
   - Add Findc-ares.cmake module. (#20815 
   <https://github.com/grpc/grpc/pull/20815>)
   - Census client filter: use current span and tags. (#21249 
   <https://github.com/grpc/grpc/pull/21249>)
   - Improve & update BUILDING.md. (#21329 
   <https://github.com/grpc/grpc/pull/21329>)

C#
   
   - Introduce ChannelBase.ShutdownAsync() in a backward-compatible manner. 
   (#21667 <https://github.com/grpc/grpc/pull/21667>)
   - c# - reduce delegate allocations in the Async*Call API. (#21365 
   <https://github.com/grpc/grpc/pull/21365>)
   - C# health checks watch. (#21120 
   <https://github.com/grpc/grpc/pull/21120>)

Python
   
   - Drop manylinux1 support. Manylinux2010 is now the recommended Linux 
   wheel format. (#21790 <https://github.com/grpc/grpc/pull/21790>)
   - [Aio] Implement add_done_callback and time_remaining. (#21681 
   <https://github.com/grpc/grpc/pull/21681>)
   - [Aio] Support SO_REUSEPORT channel option. (#21643 
   <https://github.com/grpc/grpc/pull/21643>)
   - [Aio] Support metadata. (#21647 
   <https://github.com/grpc/grpc/pull/21647>)
   - [Aio] Client Streaming and Bi-di Streaming. (#21517 
   <https://github.com/grpc/grpc/pull/21517>)
   - [Aio] Abort mechanism for server side. (#21582 
   <https://github.com/grpc/grpc/pull/21582>)
   - [Aio] Implement connectivity state related APIs. (#21621 
   <https://github.com/grpc/grpc/pull/21621>)
   - [Aio] Support credentials for unary calls. (#21351 
   <https://github.com/grpc/grpc/pull/21351>)
   - [Aio] Support channel argument for both client and server. (#21607 
   <https://github.com/grpc/grpc/pull/21607>)
   - [Aio] Client Side Interceptor For Unary Calls. (#21455 
   <https://github.com/grpc/grpc/pull/21455>)
   - [Aio] Call correctly the connect CB error when an error happens. (
   #21543 <https://github.com/grpc/grpc/pull/21543>)
   - [bazel] Add more stringent check for detection of python headers. (
   #21477 <https://github.com/grpc/grpc/pull/21477>)
   - [Aio] Streaming API - Server side streaming. (#21232 
   <https://github.com/grpc/grpc/pull/21232>)
   - Ship grpcio-status with the actual proto file. (#21377 
   <https://github.com/grpc/grpc/pull/21377>)



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