Migrating from Nx Metadata SDK 5.1 to 6.0 — Concerns & Questions

I'm currently evaluating the transition from Nx Metadata SDK 5.1 to 6.0 for a real-time object detection pipeline integrated with Nx Witness. I’ve been using JSON-based metadata injection via HTTP POST and plugin-side logic, but I understand that SDK 6.0 introduces Protocol Buffers and gRPC streaming.

Here are some specific concerns I’d love input on:

 1. Metadata Format Migration

• How painful is the switch from JSON to protobuf in practice?
• Are there official .proto definitions for common object/event types, or do we need to define our own?
• Any tips for converting existing nlohmann::json C++ logic to protobuf?

 2. Injection Mechanism Changes

• Is gRPC now the preferred method for metadata injection, or can we still use HTTP POST for backward compatibility?
• For plugin-side injection, what’s the recommended way to stream protobuf metadata into the server?

 3. Plugin Architecture

• Are there major changes in plugin registration or lifecycle management?
• Any gotchas when adapting existing C++ plugins to the new SDK headers and protobuf dependencies?

 4. Deployment & Compatibility

• Is SDK 6.0 backward-compatible with Nx Witness 5.x clients?
• Any known issues with ARM builds or edge deployment workflows?

 Bonus: Testing & Debugging

• What tools or strategies do you use to validate protobuf metadata injection?
• Any sample plugins or test harnesses for 6.0 that helped you get started?

Would really appreciate any insights, migration tips, or sample code. Thanks in advance!