@Override
            public boolean visitGroup(Group g) {
                if (g.isLeafGroup()) {
                    groupsTotal++;
                    nodesTotal += g.getNodes().size();
                }
                return true;
            }
Immutable encapsulation of a content cluster distribution configuration,
including the original config object as well as its processed Distribution
and Slime config representations.
clustercontroller-core/src/main/java/com/yahoo/vespa/clustercontroller/core/DistributionConfigBundle.java