description: When in equilibrium selection is evenly distributed topology_description: type: Sharded servers: - address: a:27017 avg_rtt_ms: 35 type: Mongos - address: b:27017 avg_rtt_ms: 35 type: Mongos - address: c:27017 avg_rtt_ms: 35 type: Mongos mocked_topology_state: - address: a:27017 operation_count: 5 - address: b:27017 operation_count: 5 - address: c:27017 operation_count: 5 iterations: 2000 outcome: tolerance: 0.05 expected_frequencies: a:27017: 0.33 b:27017: 0.33 c:27017: 0.33