Optional model version

[zevisert]

The descriptions for "Model Ready" and "Model Metadata" in both the REST and gRPC specifications claim that the model version is optional. Is this true? If so, the specification should report it's optionality in more than a comment/description (optional in proto3 and required: false in openAPI). If the version is optional in the REST protocol, should there instead be another versionless route instead of eg, '/v2/models/${MODEL_NAME}/versions/${MODEL_VERSION}/ready'?

open-inference-protocol/specification/protocol/open_inference_grpc.proto

Lines 68 to 70 in eeb043e

	// The version of the model to check for readiness. If not given the
	// server will choose a version based on the model and internal policy.
	string version = 2;

open-inference-protocol/specification/protocol/open_inference_grpc.proto

Lines 98 to 100 in eeb043e

	// The version of the model to check for readiness. If not given the
	// server will choose a version based on the model and internal policy.
	string version = 2;

open-inference-protocol/specification/protocol/open_inference_rest.yaml

Line 61 in eeb043e

description: The “model ready” health API indicates if a specific model is ready for inferencing. The model name and (optionally) version must be available in the URL. If a version is not provided the server may choose a version based on its own policies.

open-inference-protocol/specification/protocol/open_inference_rest.yaml

Line 104 in eeb043e

description: 'The per-model metadata endpoint provides information about a model. A model metadata request is made with an HTTP GET to a model metadata endpoint. In the corresponding response the HTTP body contains the [Model Metadata Response JSON Object](#model-metadata-response-json-object) or the [Model Metadata Response JSON Error Object](#model-metadata-response-json-error-object). The model name and (optionally) version must be available in the URL. If a version is not provided the server may choose a version based on its own policies or return an error.'

---

• Cloned from Optional model version kserve/open-inference-protocol#14

[zevisert]

RPC needs optionality for it's requests too