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The key difference is that the kubelet must remember all plugin instances because it could always happen that the new instance dies and leaves only the old one running. The endpoints of each instance must be different. Registering a plugin with the same endpoint as some other instance is not supported and triggers an error, which should get reported as "not registered" to the plugin. This should only happen when the kubelet missed some unregistration event and re-registers the same instance again. The recovery in this case is for the plugin to shut down, remove its socket, which should get observed by kubelet, and then try again after a restart.