message: Updated metric query in example
diff: "lastUpdatedTime": "2017-06-23T21:23:52.0221265Z",
  "provisioningState": "Succeeded",
  "source": {
  - "query": "Heartbeat | count",
  + "query": "Heartbeat | summarize AggregatedValue = count() by bin(TimeGenerated, 5m)",
  "dataSourceId": "/subscriptions/b67f7fec-69fc-4974-9099-a26bd6ffeda3/resourceGroups/Rac46PostSwapRG/providers/Microsoft.OperationalInsights/workspaces/sampleWorkspace",
  "queryType": "ResultCount"
  },
  "thresholdOperator": "GreaterThan",
  "threshold": 5,
  "metricTriggerType": "Consecutive",
  - "metricColumn": "ColumnName"
  + "metricColumn": "Computer"
  }
  }
  }
  "lastUpdatedTime": "2017-06-23T21:23:52.0221265Z",
  "provisioningState": "Succeeded",
  "source": {
  - "query": "Heartbeat | count",
  + "query": "Heartbeat | summarize AggregatedValue = count() by bin(TimeGenerated, 5m)",
  "dataSourceId": "/subscriptions/b67f7fec-69fc-4974-9099-a26bd6ffeda3/resourceGroups/Rac46PostSwapRG/providers/Microsoft.OperationalInsights/workspaces/sampleWorkspace",
  "queryType": "ResultCount"
  },
  "thresholdOperator": "GreaterThan",
  "threshold": 5,
  "metricTriggerType": "Consecutive",
  - "metricColumn": "ColumnName"
  + "metricColumn": "Computer"
  }
  }
  }
  