I don't think there can be 1 fits all solution. Feature flag is at its core is nothing but a piece of your product code. There are millions variants to impleme

I don't think there can be 1 fits all solution. Feature flag is at its core is nothing but a piece of your product code. There are millions variants to implement a product, even within the same environment/infra constraints. If you elaborate your specific goals and products - that may be a very fruitful topic.