model.protomeans that it accepts the opentelemetry http_protobuf format. I'm guessing it does.
When instrumenting a project your application should only depend on the OpenTelemetry API application, found in directory apps/opentelemetry_api of this repo which is published as the hex package opentelemetry_api.
This is confusing - since to instrumnet my project, isn’t it supposed to use SDK, not API? e.g. SDK actually holds the implementation, and sdk depends on api, not vice versa