[Hub Generated] Review request for Microsoft.Consumption to add version stable/2019-10-01 (Azure#13378)

* Added swagger updates for the optional forecastSpend JSON field in Budget API

* Review feedback

* Internal review update

Author: olsaal-msft

specification/consumption/resource-manager/Microsoft.Consumption/stable/2019-10-01/consumption.json

@@ -3950,6 +3950,11 @@
             "$ref": "#/definitions/Notification"
           },
           "maxItems": 5
+        },
+        "forecastSpend": {
+          "description": "The forecasted cost which is being tracked for a budget.",
+          "$ref": "#/definitions/ForecastSpend",
+          "readOnly": true
         }
       },
       "required": [
@@ -4064,6 +4069,22 @@
         }
       }
     },
+    "ForecastSpend": {
+      "description": "The forecasted cost which is being tracked for a budget.",
+      "properties": {
+        "amount": {
+          "description": "The forecasted cost for the total time period which is being tracked by the budget. This value is only provided if the budget contains a forecast alert type.",
+          "type": "number",
+          "format": "decimal",
+          "readOnly": true
+        },
+        "unit": {
+          "description": "The unit of measure for the budget amount.",
+          "type": "string",
+          "readOnly": true
+        }
+      }
+    },
     "Notification": {
       "description": "The notification associated with a budget.",
       "properties": {