alice writes into 3 distinct namespaces: ['scenario42-18bba3-0', 'scenario42-18bba3-1', 'scenario42-18bba3-2']
settle 10s for namespace index fanout
  node-1 sees 3/3 target namespaces, counts: {'scenario42-18bba3-0': 2, 'scenario42-18bba3-1': 2, 'scenario42-18bba3-2': 2}
  node-2 sees 3/3 target namespaces, counts: {'scenario42-18bba3-0': 2, 'scenario42-18bba3-1': 2, 'scenario42-18bba3-2': 2}
  node-3 sees 3/3 target namespaces, counts: {'scenario42-18bba3-0': 2, 'scenario42-18bba3-1': 2, 'scenario42-18bba3-2': 2}
  node-4 sees 3/3 target namespaces, counts: {'scenario42-18bba3-0': 2, 'scenario42-18bba3-1': 2, 'scenario42-18bba3-2': 2}