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Core

• gRPC stats will only be collected for debug builds or if?GRPC_COLLECT_STATS?is defined. It will be disabled for opt builds. (#15280)
• Fix for Issue?#13553. Unlimited can now be set as the max receive message length. (#15394)

Objective-C

• CFStream networking layer open for experiment (#15069,?#15677,?#15718)
• Fixed issue where BoringSSL podspec cannot be accessed from China (#15428,?#15612)
• Bug fixes for gRPC Objective-C (#13180,?#15050,?#15285,?#15429,?#15531, )

PHP

• Experimental support for the client-side interceptor. (#13342,?#15779)
• Add upper bound for the persistent channel per target, which can be set by the option ¡®grpc_target_persist_bound¡¯. By default, only 1 channel will be persisted for each target. (#15218)
• Add experimental API for the call invoker. (#15749)

Python

• Binary wheels for Python 3.7 on?manylinux1?platform are now available.
• Source code is now Pylint 1.9.2-compliant (#15682).
• Testing utilities for gRPC Python are now readily available via?grpcio-testing?from PyPI (#15819).
• requirements.txt?no longer lists the?futures?package as a dependency¡ªwhose installation used to be unnecessary on Python 3 but now actively breaks on Python 3 (#15362).
• Python errors have become more verbose. They now surface the actual error from gRPC Core:?#13689
• GRPC_ENABLE_FORK_SUPPORT=false?is no longer required when running?fork-exec.
• Relying on an explicit?with?statement or explicitly calling?Channel.close?to release the underlying resources in?Channel?objects is now a required coding practice starting in?v1.13.0.

·¢²¼ËµÃ÷ºÍÔ´ÂëÏÂÔØ?https://github.com/grpc/grpc/releases/tag/v1.13.0

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