Merge branch 'feature/profile-requests-conditionally' into 'master'

Return request profiling info when a header is passed

## What does this MR do?
It allows returning profiling info (instead of actual content) when a certain header is passed

## Why was this MR needed?
To facilitate having a performance overview of certain requests.

## What are the relevant issue numbers?
https://gitlab.com/gitlab-com/infrastructure/issues/211

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] ~~[Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)~~
- [ ] ~~API support added~~
- ~~Tests~~
  - [ ] ~~Added for this feature/bug~~
  - [ ] ~~All builds are passing~~
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5281

3 files changed, 31 insertions, 1 deletions

diff --git a/app/views/admin/background_jobs/_head.html.haml b/app/views/admin/background_jobs/_head.html.haml
index 9d722bd7382..89d7a40d6b0 100644
--- a/app/views/admin/background_jobs/_head.html.haml
+++ b/app/views/admin/background_jobs/_head.html.haml
@@ -16,3 +16,7 @@
       = link_to admin_health_check_path, title: 'Health Check' do
         %span
           Health Check
+    = nav_link(controller: :requests_profiles) do
+      = link_to admin_requests_profiles_path, title: 'Requests Profiles' do
+        %span
+          Requests Profiles
diff --git a/app/views/admin/requests_profiles/index.html.haml b/app/views/admin/requests_profiles/index.html.haml
new file mode 100644
index 00000000000..ae918086a57
--- /dev/null
+++ b/app/views/admin/requests_profiles/index.html.haml
@@ -0,0 +1,26 @@
+- @no_container = true
+- page_title 'Requests Profiles'
+= render 'admin/background_jobs/head'
+
+%div{ class: container_class }
+  %h3.page-title
+    = page_title
+
+  .bs-callout.clearfix
+    Pass the header
+    %code X-Profile-Token: #{@profile_token}
+    to profile the request
+
+  - if @profiles.present?
+    .prepend-top-default
+      - @profiles.each do |path, profiles|
+        .panel.panel-default.panel-small
+          .panel-heading
+            %code= path
+          %ul.content-list
+            - profiles.each do |profile|
+              %li
+                = link_to profile.time.to_s(:long), admin_requests_profile_path(profile), data: {no_turbolink: true}
+  - else
+    %p
+      No profiles found
diff --git a/app/views/layouts/nav/_admin.html.haml b/app/views/layouts/nav/_admin.html.haml
index 5ee8772882e..ac04f57e217 100644
--- a/app/views/layouts/nav/_admin.html.haml
+++ b/app/views/layouts/nav/_admin.html.haml
@@ -9,7 +9,7 @@
       = link_to admin_root_path, title: 'Overview', class: 'shortcuts-tree' do
         %span
           Overview
-    = nav_link(controller: %w(system_info background_jobs logs health_check)) do
+    = nav_link(controller: %w(system_info background_jobs logs health_check requests_profiles)) do
       = link_to admin_system_info_path, title: 'Monitoring' do
         %span
           Monitoring