gRPC bindings for languages that aren&#x27;t popular at Google (e.g., Ruby, Node) aren&#x27;t particularly mature. Each of the different language bindings is independently maintained, so there is no guarantee of feature parity across the languages.<p>We do not have Quark&#x2F;DC running in production yet. Most of the adoption has been in the realm of testing scenarios (it&#x27;s super handy to be able to generate client stubs).