@Override
    public String label() {
        LinkedList<String> configNames = configKeys().stream().map(k -> k.getName() + ".def").collect(Collectors.toCollection(LinkedList::new));

        configNames.addFirst(instanceType().getSimpleName());
        configNames.addFirst(Node.packageName(instanceType()));

        return "{" + String.join("|", configNames) + "}";
    }
@author Tony Vaagenes
@author gjoranv
@author ollivir
container-core/src/main/java/com/yahoo/container/di/componentgraph/core/ComponentNode.java