{
  "description": "Monitoring a topology that is required to be a replica set",
  "uri": "mongodb://a,b/?replicaSet=rs",
  "phases": [
    {
      "responses": [
        [
          "a:27017",
          {
            "ok": 1,
            "helloOk": true,
            "isWritablePrimary": true,
            "setName": "rs",
            "setVersion": 1,
            "primary": "a:27017",
            "hosts": [
              "a:27017",
              "b:27017"
            ],
            "minWireVersion": 0,
            "maxWireVersion": 6
          }
        ]
      ],
      "outcome": {
        "events": [
          {
            "topology_opening_event": {
              "topologyId": "42"
            }
          },
          {
            "topology_description_changed_event": {
              "topologyId": "42",
              "previousDescription": {
                "topologyType": "Unknown",
                "servers": []
              },
              "newDescription": {
                "topologyType": "ReplicaSetNoPrimary",
                "setName": "rs",
                "servers": [
                  {
                    "address": "a:27017",
                    "arbiters": [],
                    "hosts": [],
                    "passives": [],
                    "type": "Unknown"
                  },
                  {
                    "address": "b:27017",
                    "arbiters": [],
                    "hosts": [],
                    "passives": [],
                    "type": "Unknown"
                  }
                ]
              }
            }
          },
          {
            "server_opening_event": {
              "topologyId": "42",
              "address": "a:27017"
            }
          },
          {
            "server_opening_event": {
              "topologyId": "42",
              "address": "b:27017"
            }
          },
          {
            "server_description_changed_event": {
              "topologyId": "42",
              "address": "a:27017",
              "previousDescription": {
                "address": "a:27017",
                "arbiters": [],
                "hosts": [],
                "passives": [],
                "type": "Unknown"
              },
              "newDescription": {
                "address": "a:27017",
                "arbiters": [],
                "hosts": [
                  "a:27017",
                  "b:27017"
                ],
                "passives": [],
                "primary": "a:27017",
                "setName": "rs",
                "type": "RSPrimary"
              }
            }
          },
          {
            "topology_description_changed_event": {
              "topologyId": "42",
              "previousDescription": {
                "topologyType": "ReplicaSetNoPrimary",
                "setName": "rs",
                "servers": [
                  {
                    "address": "a:27017",
                    "arbiters": [],
                    "hosts": [],
                    "passives": [],
                    "type": "Unknown"
                  },
                  {
                    "address": "b:27017",
                    "arbiters": [],
                    "hosts": [],
                    "passives": [],
                    "type": "Unknown"
                  }
                ]
              },
              "newDescription": {
                "topologyType": "ReplicaSetWithPrimary",
                "setName": "rs",
                "servers": [
                  {
                    "address": "a:27017",
                    "arbiters": [],
                    "hosts": [
                      "a:27017",
                      "b:27017"
                    ],
                    "passives": [],
                    "primary": "a:27017",
                    "setName": "rs",
                    "type": "RSPrimary"
                  },
                  {
                    "address": "b:27017",
                    "arbiters": [],
                    "hosts": [],
                    "passives": [],
                    "type": "Unknown"
                  }
                ]
              }
            }
          }
        ]
      }
    }
  ]
}