json_schema: {
      "properties": {
          "channel": {
              "description": "The name of the channel along which to segment the count",
              "type": "string"
          },
          "count": {
              "description": "The count of the number of events",
              "type": "integer"
          },
          "period": {
              "description": "The period described by each data point",
              "enum": [
                  "hour",
                  "day",
                  "week",
                  "month",
                  "year",
                  "decade",
                  "century"
              ]
          }
      },
      "required": [
          "count",
          "channel"
      ],
      "title": "Transactions by channel",
      "type": "object"
  }