Returns the total number of issues in the JSON response

app/controllers/projects/boards/issues_controller.rb

@@ -8,12 +8,15 @@ module Projects
         issues = ::Boards::Issues::ListService.new(project, current_user, filter_params).execute
         issues = issues.page(params[:page])
 
-        render json: issues.as_json(
+        render json: {
+          issues: issues.as_json(
             only: [:iid, :title, :confidential],
             include: {
               assignee: { only: [:id, :name, :username], methods: [:avatar_url] },
               labels:   { only: [:id, :title, :description, :color, :priority], methods: [:text_color] }
-          })
+            }),
+          size: issues.total_count
+        }
       end
 
       def update

spec/fixtures/api/schemas/issues.json

 {
+  "type": "object",
+  "required" : [
+    "issues",
+    "size"
+  ],
+  "properties" : {
+    "issues": {
       "type": "array",
       "items": { "$ref": "issue.json" }
+    },
+    "size": { "type": "integer" }
+  },
+  "additionalProperties": false
 }