It could be useful for containerd clients(eg buildkit) to detect if the containerd they are talking to is the same that was used in previous requests and for what they already have some internal state. For example, if someone clears their state directory it could detect that and clear the associated build state as well. Ideally, this could be an extra UUID field in the plugin properties in the introspection API. For my use case, I would only use it for the snapshotter plugins.

@stevvooe