{
  ...
  "resources": [
    {
      "apiVersion": "2018-04-01",
      "name": "[parameters('iotHubName')]",
      "type": "Microsoft.Devices/IotHubs",
      "location": "[resourceGroup().location]",
      "sku": {
        "name": "[parameters('iotHubSkuName')]",
        "capacity": "[parameters('iotHubSkuCapacity')]"
      },
      "properties": {
        "eventHubEndpoints": {
          "events": {
            "retentionTimeInDays": "[parameters('iotHubMessageRetentionInDays')]",
            "partitionCount": "[parameters('iotHubPartitionCount')]"
          },
          "operationsMonitoringEvents": {
            "retentionTimeInDays": "[parameters('iotHubMessageRetentionInDays')]",
            "partitionCount": "[parameters('iotHubPartitionCount')]"
          }
        }
      }
    }
  ]
  ...
}