{
    "in_latency_window": [],
    "operation": "read",
    "read_preference": {
        "mode": "Nearest",
        "tag_sets": [
            {}
        ]
    },
    "suitable_servers": [],
    "topology_description": {
        "servers": [
            {
                "address": "b:27017",
                "avg_rtt_ms": 5,
                "type": "PossiblePrimary"
            }
        ],
        "type": "ReplicaSetNoPrimary"
    }
}
