I will close this issue since it can be handled by OpenFeature directly.
If you want to use GO Feature Flag in combination with OpenTelemetry the best option is to use the GO Feature Flag provider for OpenFeature _(see doc) and to use the associate OpenTelemetry hook for OpenFeature (see docs)_.
Requirements
Add support for opentelemetry. The goal is to be able to track when we call the retriever to get the new value of the flag
But it could be great also to have a way to notify that a flag has changed to be able to see in your dataset that a something has changed in your app.