Add latest changes from gitlab-org/gitlab@master

4 files changed, 17 insertions, 5 deletions

diff --git a/doc/api/epics.md b/doc/api/epics.md
index 7ef12766f78..c24df6a236f 100644
--- a/doc/api/epics.md
+++ b/doc/api/epics.md
@@ -88,6 +88,7 @@ Example response:
   "due_date_from_milestones": "2018-07-31",
   "created_at": "2018-07-17T13:36:22.770Z",
   "updated_at": "2018-07-18T12:22:05.239Z",
+  "closed_at": "2018-08-18T12:22:05.239Z",
   "labels": [],
   "upvotes": 4,
   "downvotes": 0
@@ -143,6 +144,7 @@ Example response:
   "due_date_from_milestones": "2018-07-31",
   "created_at": "2018-07-17T13:36:22.770Z",
   "updated_at": "2018-07-18T12:22:05.239Z",
+  "closed_at": "2018-08-18T12:22:05.239Z",
   "labels": [],
   "upvotes": 4,
   "downvotes": 0
@@ -209,6 +211,7 @@ Example response:
   "due_date_from_milestones": "2018-07-31",
   "created_at": "2018-07-17T13:36:22.770Z",
   "updated_at": "2018-07-18T12:22:05.239Z",
+  "closed_at": "2018-08-18T12:22:05.239Z",
   "labels": [],
   "upvotes": 4,
   "downvotes": 0
@@ -276,6 +279,7 @@ Example response:
   "due_date_from_milestones": "2018-07-31",
   "created_at": "2018-07-17T13:36:22.770Z",
   "updated_at": "2018-07-18T12:22:05.239Z",
+  "closed_at": "2018-08-18T12:22:05.239Z",
   "labels": [],
   "upvotes": 4,
   "downvotes": 0
@@ -358,7 +362,8 @@ Example response:
     "start_date": null,
     "end_date": null,
     "created_at": "2018-01-21T06:21:13.165Z",
-    "updated_at": "2018-01-22T12:41:41.166Z"
+    "updated_at": "2018-01-22T12:41:41.166Z",
+    "closed_at": "2018-08-18T12:22:05.239Z"
   },
   "target_url": "https://gitlab.example.com/groups/epics/5",
   "body": "Vel voluptas atque dicta mollitia adipisci qui at.",
diff --git a/doc/development/fe_guide/development_process.md b/doc/development/fe_guide/development_process.md
index 41513e6d57e..21e0c869f13 100644
--- a/doc/development/fe_guide/development_process.md
+++ b/doc/development/fe_guide/development_process.md
@@ -80,7 +80,7 @@ With the purpose of being [respectful of others' time](https://about.gitlab.com/
 
 1. Before writing code, ensure your vision of the architecture is aligned with
    GitLab's architecture.
-1. Add a diagram to the issue and ask a frontend architect in the slack channel `#fe_architectural` about it.
+1. Add a diagram to the issue and ask a frontend maintainer in the slack channel `#frontend_maintainers` about it.
 
    ![Diagram of Issue Boards Architecture](img/boards_diagram.png)
 
diff --git a/doc/development/fe_guide/graphql.md b/doc/development/fe_guide/graphql.md
index 22e773e8ea3..fe4f6d7bec8 100644
--- a/doc/development/fe_guide/graphql.md
+++ b/doc/development/fe_guide/graphql.md
@@ -1,11 +1,18 @@
 # GraphQL
 
+Our GraphQL API can be explored via GraphiQL at your instance's
+`/-/graphql-explorer` or at [GitLab.com](https://gitlab.com/-/graphql-explorer).
+
+You can check all existing queries and mutations on the right side
+of GraphiQL in its **Documentation explorer**. It's also possible to
+write queries and mutations directly on the left tab and check
+their execution by clicking **Execute query** button on the top left:
+
+![GraphiQL interface](img/graphiql_explorer_v12_4.png)
+
 We use [Apollo] and [Vue Apollo][vue-apollo] for working with GraphQL
 on the frontend.
 
-In order to use GraphQL, you need to enable the `graphql` feature flag,
-read more about [Feature Flags][feature-flags].
-
 ## Apollo Client
 
 To save duplicated clients getting created in different apps, we have a
diff --git a/doc/development/fe_guide/img/graphiql_explorer_v12_4.png b/doc/development/fe_guide/img/graphiql_explorer_v12_4.png
new file mode 100644
index 00000000000..8981b37ba23
--- /dev/null
+++ b/doc/development/fe_guide/img/graphiql_explorer_v12_4.png