private String configGenerationsString() {
        return String.format("bootstrap generation = %d\n" + "components generation: %d\n" + "previous generation: %d",
                             getBootstrapGeneration(), getComponentsGeneration(), previousConfigGeneration);
    }
@author gjoranv
@author Tony Vaagenes
@author ollivir
container-core/src/main/java/com/yahoo/container/di/Container.java