如何获得使用API​​在GUI中看到的所有指标？

Question

我正在尝试为以下视图创建API调用

到目前为止，我已经创建了以下API调用，但仅返回访问。

根据文档，我无法为ga:acquisitionTrafficChannel指定指标，我想在此视图中获取所有指标。

我的API调用是

{
  "reportRequests": [
    {
      "viewId": "xxxx",
      "dimensions": [
        {
          "name": "ga:cohort"
        },
        {
          "name": "ga:acquisitionTrafficChannel"
        }
      ],
      "cohortGroup": {
        "cohorts": [
          {
            "dateRange": {
              "startDate": "2019-01-01",
              "endDate": "2019-05-30"
            }
          }
        ]
      },
      "dimensionFilterClauses": [
        {
          "filters": [
            {
              "dimensionName": "ga:acquisitionTrafficChannel",
              "expressions": [
                "organic|direct"
              ]
            }
          ]
        }
      ]
    }
  ]
}

输出是这样的

{
  "reports": [
    {
      "columnHeader": {
        "dimensions": [
          "ga:cohort",
          "ga:acquisitionTrafficChannel"
        ],
        "metricHeader": {
          "metricHeaderEntries": [
            {
              "name": "ga:visits",
              "type": "INTEGER"
            }
          ]
        }
      },
      "data": {
        "rows": [
          {
            "dimensions": [
              "cohort_1",
              "Direct"
            ],
            "metrics": [
              {
                "values": [
                  "100"
                ]
              }
            ]
          },
          {
            "dimensions": [
              "cohort_1",
              "Organic Search"
            ],
            "metrics": [
              {
                "values": [
                  "100"
                ]
              }
            ]
          }
        ],
        "totals": [
          {
            "values": [
              "200"
            ]
          }
        ],
        "rowCount": 2,
        "minimums": [
          {
            "values": [
              "1"
            ]
          }
        ],
        "maximums": [
          {
            "values": [
              "100"
            ]
          }
        ],
        "isDataGolden": true
      }
    }
  ]
}

如何获取所有指标，而不仅仅是访问？ 我将每天运行一个脚本来获取这些数据。