Features
- [1109](https://github.com/rasahq/rasa-sdk/issues/1109): Rasa SDK now supports gRPC protocol.
This allows users to use gRPC to invoke custom actions.
Users can use secure (TLS) and insecure connections to communicate over gRPC.
To start action server with gRPC use `--grpc` flag.
For SSL support, users can provide `--ssl-keyfile`, `--ssl-certificate` and `--ssl-ca-file`.
Support for `--ssl-password` is not available yet due to a limitation in the gRPC Python library.
Bugfixes
- [1117](https://github.com/rasahq/rasa-sdk/issues/1117): Tracing is supported for actions called over gRPC protocol.
Miscellaneous internal changes
- [1113](https://github.com/rasahq/rasa-sdk/issues/1113), [#1120](https://github.com/rasahq/rasa-sdk/issues/1120)