v0.29.0 contained a lot of interesting features. Have a look at the release notes for details! gRPC is a light-weight open-source RPC framework. It was originally developed by Google, with 1.0 being released in August 2016. Since then, it's gained a lot of attention as well as a wide adoption. In comparison to JSON, which is transmitted as human-readable text, gRPC is binary, making it both faster to transmit and more compact.