Merge branch 'ac-packages-size-api-docs' into 'master'

Document packages_size statistics API

See merge request gitlab-org/gitlab-ee!12213

doc/api/groups.md

@@ -69,8 +69,8 @@ GET /groups?statistics=true
       "storage_size" : 212,
       "repository_size" : 33,
       "lfs_objects_size" : 123,
-      "job_artifacts_size" : 57
-
+      "job_artifacts_size" : 57,
+      "packages_size": 0
     }
   }
 ]

doc/api/projects.md

@@ -155,7 +155,8 @@ When the user is authenticated and `simple` is not set this returns something li
       "storage_size": 1038090,
       "repository_size": 1038090,
       "lfs_objects_size": 0,
-      "job_artifacts_size": 0
+      "job_artifacts_size": 0,
+      "packages_size": 0
     },
     "_links": {
       "self": "http://example.com/api/v4/projects",
@@ -237,7 +238,8 @@ When the user is authenticated and `simple` is not set this returns something li
       "storage_size": 2066080,
       "repository_size": 2066080,
       "lfs_objects_size": 0,
-      "job_artifacts_size": 0
+      "job_artifacts_size": 0,
+      "packages_size": 0
     },
     "_links": {
       "self": "http://example.com/api/v4/projects",
@@ -345,7 +347,8 @@ GET /users/:user_id/projects
       "storage_size": 1038090,
       "repository_size": 1038090,
       "lfs_objects_size": 0,
-      "job_artifacts_size": 0
+      "job_artifacts_size": 0,
+      "packages_size": 0
     },
     "_links": {
       "self": "http://example.com/api/v4/projects",
@@ -426,7 +429,8 @@ GET /users/:user_id/projects
       "storage_size": 2066080,
       "repository_size": 2066080,
       "lfs_objects_size": 0,
-      "job_artifacts_size": 0
+      "job_artifacts_size": 0,
+      "packages_size": 0
     },
     "_links": {
       "self": "http://example.com/api/v4/projects",
@@ -553,7 +557,8 @@ GET /projects/:id
     "storage_size": 1038090,
     "repository_size": 1038090,
     "lfs_objects_size": 0,
-    "job_artifacts_size": 0
+    "job_artifacts_size": 0,
+    "packages_size": 0
   },
   "_links": {
     "self": "http://example.com/api/v4/projects",