alice writes into 3 distinct namespaces: ['scenario42-ab7e64-0', 'scenario42-ab7e64-1', 'scenario42-ab7e64-2']
settle 10s for namespace index fanout
  node-1 sees 3/3 target namespaces, counts: {'scenario42-ab7e64-0': 2, 'scenario42-ab7e64-1': 2, 'scenario42-ab7e64-2': 2}
  node-2 sees 3/3 target namespaces, counts: {'scenario42-ab7e64-0': 2, 'scenario42-ab7e64-1': 2, 'scenario42-ab7e64-2': 2}
  node-3 sees 3/3 target namespaces, counts: {'scenario42-ab7e64-0': 2, 'scenario42-ab7e64-1': 2, 'scenario42-ab7e64-2': 2}
  node-4 sees 3/3 target namespaces, counts: {'scenario42-ab7e64-0': 2, 'scenario42-ab7e64-1': 2, 'scenario42-ab7e64-2': 2}