{
  "description": "Monitoring a load balancer",
  "uri": "mongodb://a:27017/?loadBalanced=true",
  "phases": [
    {
      "outcome": {
        "events": [
          {
            "topology_opening_event": {
              "topologyId": "42"
            }
          },
          {
            "topology_description_changed_event": {
              "topologyId": "42",
              "previousDescription": {
                "topologyType": "Unknown",
                "servers": []
              },
              "newDescription": {
                "topologyType": "LoadBalanced",
                "servers": [
                  {
                    "address": "a:27017",
                    "arbiters": [],
                    "hosts": [],
                    "passives": [],
                    "type": "Unknown"
                  }
                ]
              }
            }
          },
          {
            "server_opening_event": {
              "topologyId": "42",
              "address": "a: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": [],
                "passives": [],
                "type": "LoadBalancer"
              }
            }
          },
          {
            "topology_description_changed_event": {
              "topologyId": "42",
              "previousDescription": {
                "topologyType": "LoadBalanced",
                "servers": [
                  {
                    "address": "a:27017",
                    "arbiters": [],
                    "hosts": [],
                    "passives": [],
                    "type": "Unknown"
                  }
                ]
              },
              "newDescription": {
                "topologyType": "LoadBalanced",
                "servers": [
                  {
                    "address": "a:27017",
                    "arbiters": [],
                    "hosts": [],
                    "passives": [],
                    "type": "LoadBalancer"
                  }
                ]
              }
            }
          }
        ]
      }
    }
  ]
}