> It’s the language behind Kubernetes admission policies, Envoy’s RBAC rules, Google Cloud IAM conditions, and gRPC’s protovalidate

Very small nitpick, but AFAIK protovalidate comes from Buf, not Google. While protovalidate DOES work with gRPC via backward compatibility (but also Buf's ConnectRPC), saying "gRPC's protovalidate" probably makes people think it came from Google.

Disclaimer: I have no affiliation with either Buf or Google.

Very fair point that protovalidate comes from Buf, not Google.

But it's worth noting that protovalidate can also work with plain gRPC - it's an independent library, and anyone can write a gRPC interceptor that uses it. Here's a community-supported example in Go: https://pkg.go.dev/github.com/grpc-ecosystem/go-grpc-middlew...

I think its more important that protovalidate is not affiliated with grpc in any way. One needs a custom middleware to implement the protovalidate rules for your language used.