Add latest changes from gitlab-org/gitlab@master

25 files changed, 803 insertions, 334 deletions

diff --git a/.gitlab/ci/dev-fixtures.gitlab-ci.yml b/.gitlab/ci/dev-fixtures.gitlab-ci.yml
index a5dab5d8708..a0b5100992b 100644
--- a/.gitlab/ci/dev-fixtures.gitlab-ci.yml
+++ b/.gitlab/ci/dev-fixtures.gitlab-ci.yml
@@ -1,6 +1,54 @@
+# Make sure to update all the similar conditions in other CI config files if you modify these conditions
+.if-not-ee: &if-not-ee
+  if: '$CI_PROJECT_NAME !~ /^gitlab(-ee)?$/'
+
+# Make sure to update all the similar conditions in other CI config files if you modify these conditions
+.if-default-refs: &if-default-refs
+  if: '$CI_COMMIT_REF_NAME == "master" || $CI_COMMIT_REF_NAME =~ /^[\d-]+-stable(-ee)?$/ || $CI_COMMIT_REF_NAME =~ /^\d+-\d+-auto-deploy-\d+$/ || $CI_COMMIT_REF_NAME =~ /^security\// || $CI_MERGE_REQUEST_IID || $CI_COMMIT_TAG'
+
+# Make sure to update all the similar patterns in other CI config files if you modify these patterns
+.code-backstage-patterns: &code-backstage-patterns
+  - ".gitlab/ci/**/*"
+  - ".{eslintignore,gitattributes,nvmrc,prettierrc,stylelintrc,yamllint}"
+  - ".{codeclimate,eslintrc,gitlab-ci,haml-lint,haml-lint_todo,rubocop,rubocop_todo,scss-lint}.yml"
+  - ".csscomb.json"
+  - "Dockerfile.assets"
+  - "*_VERSION"
+  - "Gemfile{,.lock}"
+  - "Rakefile"
+  - "{babel.config,jest.config}.js"
+  - "config.ru"
+  - "{package.json,yarn.lock}"
+  - "{,ee/}{app,bin,config,db,haml_lint,lib,locale,public,scripts,symbol,vendor}/**/*"
+  - "doc/api/graphql/reference/*" # Files in this folder are auto-generated
+  # Backstage changes
+  - "Dangerfile"
+  - "danger/**/*"
+  - "{,ee/}fixtures/**/*"
+  - "{,ee/}rubocop/**/*"
+  - "{,ee/}spec/**/*"
+  - "doc/README.md"  # Some RSpec test rely on this file
+
+.dev-fixtures:rules:ee-and-foss:
+  rules:
+    - <<: *if-default-refs
+      changes: *code-backstage-patterns
+      when: on_success
+
+.dev-fixtures:rules:ee-only:
+  rules:
+    - <<: *if-not-ee
+      when: never
+    - <<: *if-default-refs
+      changes: *code-backstage-patterns
+      when: on_success
+
 .run-dev-fixtures:
   extends:
-    - .only-code-rails-job-base
+    - .default-tags
+    - .default-retry
+    - .default-cache
+    - .default-before_script
     - .use-pg9
   stage: test
   needs: ["setup-test-env"]
@@ -13,17 +61,19 @@
     SIZE: 0 # number of external projects to fork, requires network connection
     # SEED_NESTED_GROUPS: "false" # requires network connection
 
-run-dev-fixtures-foss:
-  extends: .run-dev-fixtures
+run-dev-fixtures:
+  extends:
+    - .run-dev-fixtures
+    - .dev-fixtures:rules:ee-and-foss
   script:
     - scripts/gitaly-test-spawn
     - RAILS_ENV=test bundle exec rake db:seed_fu
 
 run-dev-fixtures-ee:
   extends:
-    - .only-ee
-    - .use-pg9-ee
     - .run-dev-fixtures
+    - .dev-fixtures:rules:ee-only
+    - .use-pg9-ee
   script:
     - scripts/gitaly-test-spawn
     - cp ee/db/fixtures/development/* $FIXTURE_PATH
diff --git a/.gitlab/ci/rails.gitlab-ci.yml b/.gitlab/ci/rails.gitlab-ci.yml
index 03685d1f6a8..3d890dfea7e 100644
--- a/.gitlab/ci/rails.gitlab-ci.yml
+++ b/.gitlab/ci/rails.gitlab-ci.yml
@@ -1,41 +1,120 @@
-.only-master:
-  only:
-    refs:
-      - master
-
-.rake-exec:
+# Make sure to update all the similar conditions in other CI config files if you modify these conditions
+.if-not-ee: &if-not-ee
+  if: '$CI_PROJECT_NAME !~ /^gitlab(-ee)?$/'
+
+# Make sure to update all the similar conditions in other CI config files if you modify these conditions
+.if-master-refs: &if-master-refs
+  if: '$CI_COMMIT_REF_NAME == "master"'
+
+# Make sure to update all the similar conditions in other CI config files if you modify these conditions
+.if-default-refs: &if-default-refs
+  if: '$CI_COMMIT_REF_NAME == "master" || $CI_COMMIT_REF_NAME =~ /^[\d-]+-stable(-ee)?$/ || $CI_COMMIT_REF_NAME =~ /^\d+-\d+-auto-deploy-\d+$/ || $CI_COMMIT_REF_NAME =~ /^security\// || $CI_MERGE_REQUEST_IID || $CI_COMMIT_TAG'
+
+# Make sure to update all the similar conditions in other CI config files if you modify these conditions
+.if-merge-request: &if-merge-request
+  if: '$CI_MERGE_REQUEST_IID'
+
+# Make sure to update all the similar patterns in other CI config files if you modify these patterns
+.code-backstage-patterns: &code-backstage-patterns
+  - ".gitlab/ci/**/*"
+  - ".{eslintignore,gitattributes,nvmrc,prettierrc,stylelintrc,yamllint}"
+  - ".{codeclimate,eslintrc,gitlab-ci,haml-lint,haml-lint_todo,rubocop,rubocop_todo,scss-lint}.yml"
+  - ".csscomb.json"
+  - "Dockerfile.assets"
+  - "*_VERSION"
+  - "Gemfile{,.lock}"
+  - "Rakefile"
+  - "{babel.config,jest.config}.js"
+  - "config.ru"
+  - "{package.json,yarn.lock}"
+  - "{,ee/}{app,bin,config,db,haml_lint,lib,locale,public,scripts,symbol,vendor}/**/*"
+  - "doc/api/graphql/reference/*" # Files in this folder are auto-generated
+  # Backstage changes
+  - "Dangerfile"
+  - "danger/**/*"
+  - "{,ee/}fixtures/**/*"
+  - "{,ee/}rubocop/**/*"
+  - "{,ee/}spec/**/*"
+  - "doc/README.md"  # Some RSpec test rely on this file
+
+# Make sure to update all the similar patterns in other CI config files if you modify these patterns
+.code-backstage-qa-patterns: &code-backstage-qa-patterns
+  - ".gitlab/ci/**/*"
+  - ".{eslintignore,gitattributes,nvmrc,prettierrc,stylelintrc,yamllint}"
+  - ".{codeclimate,eslintrc,gitlab-ci,haml-lint,haml-lint_todo,rubocop,rubocop_todo,scss-lint}.yml"
+  - ".csscomb.json"
+  - "Dockerfile.assets"
+  - "*_VERSION"
+  - "Gemfile{,.lock}"
+  - "Rakefile"
+  - "{babel.config,jest.config}.js"
+  - "config.ru"
+  - "{package.json,yarn.lock}"
+  - "{,ee/}{app,bin,config,db,haml_lint,lib,locale,public,scripts,symbol,vendor}/**/*"
+  - "doc/api/graphql/reference/*" # Files in this folder are auto-generated
+  # Backstage changes
+  - "Dangerfile"
+  - "danger/**/*"
+  - "{,ee/}fixtures/**/*"
+  - "{,ee/}rubocop/**/*"
+  - "{,ee/}spec/**/*"
+  - "doc/README.md"  # Some RSpec test rely on this file
+  # QA changes
+  - ".dockerignore"
+  - "qa/**/*"
+
+.rails:rules:ee-and-foss:
+  rules:
+    - <<: *if-default-refs
+      changes: *code-backstage-patterns
+      when: on_success
+
+.rails:rules:default-refs-code-backstage-qa:
+  rules:
+    - <<: *if-default-refs
+      changes: *code-backstage-qa-patterns
+      when: on_success
+
+.rails:rules:master-refs:
+  rules:
+    - <<: *if-master-refs
+      when: on_success
+
+.rails:rules:master-refs-ee-only:
+  rules:
+    - <<: *if-not-ee
+      when: never
+    - <<: *if-master-refs
+      when: on_success
+
+.rails:rules:ee-only:
+  rules:
+    - <<: *if-not-ee
+      when: never
+    - <<: *if-default-refs
+      changes: *code-backstage-patterns
+      when: on_success
+
+.rails:needs:setup-and-assets:
+  needs:
+    - job: setup-test-env
+      artifacts: true
+    - job: compile-assets pull-cache
+      artifacts: true
+
+.rails-job-base:
   extends:
     - .default-tags
     - .default-retry
     - .default-cache
-    - .default-only
     - .default-before_script
-  variables:
-    SETUP_DB: "false"
-  script:
-    - bundle exec rake $CI_JOB_NAME
-
-.only-code-rails-job-base:
-  extends:
-    - .default-tags
-    - .default-retry
-    - .default-cache
-    - .default-only
-    - .default-before_script
-    - .only:changes-code-backstage
-
-.only-code-qa-rails-job-base:
-  extends:
-    - .default-tags
-    - .default-retry
-    - .default-cache
-    - .default-only
-    - .default-before_script
-    - .only:changes-code-backstage-qa
 
+####################
+# ee and foss jobs #
 setup-test-env:
   extends:
-    - .only-code-qa-rails-job-base
+    - .rails-job-base
+    - .rails:rules:default-refs-code-backstage-qa
     - .use-pg9
   stage: prepare
   script:
@@ -50,11 +129,48 @@ setup-test-env:
   cache:
     policy: pull-push
 
+static-analysis:
+  extends:
+    - .rails-job-base
+    - .rails:rules:default-refs-code-backstage-qa
+    - .rails:needs:setup-and-assets
+  stage: test
+  variables:
+    SETUP_DB: "false"
+  parallel: 2
+  script:
+    - scripts/static-analysis
+  cache:
+    key: "debian-stretch-ruby-2.6-and-rubocop"
+    paths:
+      - vendor/ruby
+      - tmp/rubocop_cache
+    policy: pull-push
+
+downtime_check:
+  extends:
+    - .rails-job-base
+    - .rails:needs:setup-and-assets
+  stage: test
+  rules:
+    - <<: *if-merge-request
+      changes: *code-backstage-patterns
+      when: on_success
+  variables:
+    SETUP_DB: "false"
+  script:
+    - bundle exec rake downtime_check
+
 .rspec-base:
-  extends: .only-code-rails-job-base
+  extends: .rails-job-base
   stage: test
-  needs: ["setup-test-env", "retrieve-tests-metadata", "compile-assets pull-cache"]
-  dependencies: ["setup-test-env", "retrieve-tests-metadata", "compile-assets pull-cache"]
+  needs:
+    - job: setup-test-env
+      artifacts: true
+    - job: retrieve-tests-metadata
+      artifacts: true
+    - job: compile-assets pull-cache
+      artifacts: true
   script:
     - source scripts/rspec_helpers.sh
     - rspec_paralellized_job "--tag ~quarantine --tag ~geo --tag ~level:migration"
@@ -72,26 +188,22 @@ setup-test-env:
     reports:
       junit: junit_rspec.xml
 
-.rspec-base-foss:
-  extends: [".rspec-base", ".only-ee-as-if-foss"]
-  needs: ["setup-test-env", "retrieve-tests-metadata", "compile-assets pull-cache foss"]
-  dependencies: ["setup-test-env", "retrieve-tests-metadata", "compile-assets pull-cache foss"]
-
-.rspec-base-pg9:
+.rspec-base-quarantine:
   extends:
     - .rspec-base
     - .use-pg9
+  variables:
+    RSPEC_OPTS: "--tag quarantine -- spec/"
+  script:
+    - source scripts/rspec_helpers.sh
+    - rspec_simple_job "${RSPEC_OPTS}"
+  allow_failure: true
 
-.rspec-base-pg9-foss:
-  extends:
-    - .rspec-base-foss
-    - .use-pg9
-
-.rspec-base-pg10:
+.rspec-base-pg9:
   extends:
     - .rspec-base
-    - .use-pg10
-    - .only-master
+    - .rails:rules:ee-and-foss
+    - .use-pg9
 
 .rspec-base-migration:
   script:
@@ -104,200 +216,33 @@ rspec migration pg9:
     - .rspec-base-migration
   parallel: 5
 
-rspec migration pg9-foss:
-  extends:
-    - .rspec-base-pg9-foss
-    - .rspec-base-migration
-  parallel: 5
-
 rspec unit pg9:
   extends: .rspec-base-pg9
   parallel: 20
 
-rspec unit pg9-foss:
-  extends: .rspec-base-pg9-foss
-  parallel: 20
-
 rspec integration pg9:
   extends: .rspec-base-pg9
   parallel: 8
 
-rspec integration pg9-foss:
-  extends: .rspec-base-pg9-foss
-  parallel: 8
-
 rspec system pg9:
   extends: .rspec-base-pg9
   parallel: 24
 
-rspec system pg9-foss:
-  extends: .rspec-base-pg9-foss
-  parallel: 24
-
-rspec unit pg10:
-  extends: .rspec-base-pg10
-  parallel: 20
-
-rspec integration pg10:
-  extends: .rspec-base-pg10
-  parallel: 8
-
-rspec system pg10:
-  extends: .rspec-base-pg10
-  parallel: 24
-
-.rspec-ee-base-pg9:
-  extends:
-    - .rspec-base
-    - .only-ee
-    - .use-pg9-ee
-
-.rspec-ee-base-pg10:
-  extends:
-    - .rspec-base
-    - .only-ee
-    - .use-pg10-ee
-
-rspec-ee migration pg9:
-  extends:
-    - .rspec-ee-base-pg9
-    - .rspec-base-migration
-  parallel: 2
-
-rspec-ee unit pg9:
-  extends: .rspec-ee-base-pg9
-  parallel: 10
-
-rspec-ee integration pg9:
-  extends: .rspec-ee-base-pg9
-  parallel: 4
-
-rspec-ee system pg9:
-  extends: .rspec-ee-base-pg9
-  parallel: 6
-
-rspec-ee migration pg10:
-  extends:
-    - .rspec-ee-base-pg10
-    - .rspec-base-migration
-    - .only-master
-  parallel: 2
-
-rspec-ee unit pg10:
-  extends:
-    - .rspec-ee-base-pg10
-    - .only-master
-  parallel: 10
-
-rspec-ee integration pg10:
-  extends:
-    - .rspec-ee-base-pg10
-    - .only-master
-  parallel: 3
-
-rspec-ee system pg10:
-  extends:
-    - .rspec-ee-base-pg10
-    - .only-master
-  parallel: 5
-
-.rspec-ee-base-geo:
-  extends:
-    - .rspec-base
-    - .only-ee
-  script:
-    - source scripts/rspec_helpers.sh
-    - scripts/prepare_postgres_fdw.sh
-    - rspec_paralellized_job "--tag ~quarantine --tag geo"
-
-.rspec-ee-base-geo-pg9:
-  extends:
-    - .rspec-ee-base-geo
-    - .use-pg9-ee
-
-.rspec-ee-base-geo-pg10:
-  extends:
-    - .rspec-ee-base-geo
-    - .use-pg10-ee
-
-rspec-ee unit pg9 geo:
-  extends: .rspec-ee-base-geo-pg9
-  parallel: 2
-
-rspec-ee integration pg9 geo:
-  extends: .rspec-ee-base-geo-pg9
-
-rspec-ee system pg9 geo:
-  extends: .rspec-ee-base-geo-pg9
-
-rspec-ee unit pg10 geo:
-  extends: .rspec-ee-base-geo-pg10
-  parallel: 2
-
-rspec-ee integration pg10 geo:
-  extends: .rspec-ee-base-geo-pg10
-
-rspec-ee system pg10 geo:
-  extends: .rspec-ee-base-geo-pg10
-
-rspec quarantine pg9:
-  extends:
-    - .rspec-base-pg9
-    - .only-master
-  variables:
-    RSPEC_OPTS: "--tag quarantine -- spec/"
-  script:
-    - source scripts/rspec_helpers.sh
-    - rspec_simple_job "${RSPEC_OPTS}"
-  allow_failure: true
-
-rspec-ee quarantine pg9:
-  extends:
-    - rspec quarantine pg9
-    - .only-ee
-  variables:
-    RSPEC_OPTS: "--tag quarantine -- ee/spec/"
-
 rspec fast_spec_helper:
   extends: .rspec-base-pg9
   script:
     - bin/rspec spec/fast_spec_helper.rb
 
-static-analysis:
-  extends: .only-code-qa-rails-job-base
-  stage: test
-  needs: ["setup-test-env", "compile-assets pull-cache"]
-  dependencies: ["setup-test-env", "compile-assets pull-cache"]
-  variables:
-    SETUP_DB: "false"
-  parallel: 2
-  script:
-    - scripts/static-analysis
-  cache:
-    key: "debian-stretch-ruby-2.6-and-rubocop"
-    paths:
-      - vendor/ruby
-      - tmp/rubocop_cache
-    policy: pull-push
-
-downtime_check:
-  extends:
-    - .rake-exec
-    - .only:changes-code-backstage
-    - .except:refs-master-tags-stable-deploy
-  stage: test
-  needs: ["setup-test-env"]
-  dependencies: ["setup-test-env"]
-
 .db-job-base:
   extends:
-    - .only-code-rails-job-base
+    - .rails-job-base
+    - .rails:rules:ee-and-foss
     - .use-pg9
   stage: test
-  needs: ["setup-test-env"]
-  dependencies: ["setup-test-env"]
+  needs:
+    - job: setup-test-env
+      artifacts: true
 
-# DB migration, rollback, and seed jobs
 db:migrate:reset:
   extends: .db-job-base
   script:
@@ -358,12 +303,14 @@ gitlab:setup:
       - log/development.log
 
 coverage:
-  extends: .only-code-rails-job-base
-  cache:
-    policy: pull
+  extends:
+    - .rails-job-base
+    - .rails:rules:ee-and-foss
+  stage: post-test
   variables:
     SETUP_DB: "false"
-  stage: post-test
+  cache:
+    policy: pull
   script:
     - bundle exec scripts/merge-simplecov
     - bundle exec scripts/gather-test-memory-data
@@ -375,11 +322,181 @@ coverage:
       - coverage/index.html
       - coverage/assets/
       - tmp/memory_test/
+# ee and foss jobs #
+####################
+
+####################
+# master-only jobs #
+rspec quarantine pg9:
+  extends:
+    - .rspec-base-quarantine
+    - .rails:rules:master-refs
+
+.rspec-base-pg10:
+  extends:
+    - .rspec-base
+    - .rails:rules:master-refs
+    - .use-pg10
+
+rspec unit pg10:
+  extends: .rspec-base-pg10
+  parallel: 20
+
+rspec integration pg10:
+  extends: .rspec-base-pg10
+  parallel: 8
+
+rspec system pg10:
+  extends: .rspec-base-pg10
+  parallel: 24
+# master-only jobs #
+####################
+
+#########################
+# ee + master-only jobs #
+rspec-ee quarantine pg9:
+  extends:
+    - .rspec-base-quarantine
+    - .rails:rules:master-refs-ee-only
+  variables:
+    RSPEC_OPTS: "--tag quarantine -- ee/spec/"
+
+rspec-ee migration pg10:
+  extends:
+    - .rspec-ee-base-pg10
+    - .rspec-base-migration
+    - .rails:rules:master-refs
+  parallel: 2
+
+rspec-ee unit pg10:
+  extends:
+    - .rspec-ee-base-pg10
+    - .rails:rules:master-refs
+  parallel: 10
+
+rspec-ee integration pg10:
+  extends:
+    - .rspec-ee-base-pg10
+    - .rails:rules:master-refs
+  parallel: 3
+
+rspec-ee system pg10:
+  extends:
+    - .rspec-ee-base-pg10
+    - .rails:rules:master-refs
+  parallel: 5
+# ee + master-only jobs #
+#########################
+
+#################
+# ee-only jobs #
+.rspec-base-ee:
+  extends:
+    - .rspec-base
+    - .rails:rules:ee-only
+
+.rspec-base-pg9-as-if-foss:
+  extends:
+    - .rspec-base-ee
+    - .as-if-foss
+    - .use-pg9
+  needs:
+    - job: setup-test-env
+      artifacts: true
+    - job: retrieve-tests-metadata
+      artifacts: true
+    - job: compile-assets pull-cache foss
+      artifacts: true
+
+.rspec-ee-base-pg9:
+  extends:
+    - .rspec-base-ee
+    - .use-pg9-ee
+
+.rspec-ee-base-pg10:
+  extends:
+    - .rspec-base-ee
+    - .use-pg10-ee
+
+rspec migration pg9-as-if-foss:
+  extends:
+    - .rspec-base-pg9-as-if-foss
+    - .rspec-base-migration
+  parallel: 5
+
+rspec unit pg9-as-if-foss:
+  extends: .rspec-base-pg9-as-if-foss
+  parallel: 20
+
+rspec integration pg9-as-if-foss:
+  extends: .rspec-base-pg9-as-if-foss
+  parallel: 8
+
+rspec system pg9-as-if-foss:
+  extends: .rspec-base-pg9-as-if-foss
+  parallel: 24
+
+rspec-ee migration pg9:
+  extends:
+    - .rspec-ee-base-pg9
+    - .rspec-base-migration
+  parallel: 2
+
+rspec-ee unit pg9:
+  extends: .rspec-ee-base-pg9
+  parallel: 10
+
+rspec-ee integration pg9:
+  extends: .rspec-ee-base-pg9
+  parallel: 4
+
+rspec-ee system pg9:
+  extends: .rspec-ee-base-pg9
+  parallel: 6
+
+.rspec-ee-base-geo:
+  extends: .rspec-base-ee
+  script:
+    - source scripts/rspec_helpers.sh
+    - scripts/prepare_postgres_fdw.sh
+    - rspec_paralellized_job "--tag ~quarantine --tag geo"
+
+.rspec-ee-base-geo-pg9:
+  extends:
+    - .rspec-ee-base-geo
+    - .use-pg9-ee
+
+.rspec-ee-base-geo-pg10:
+  extends:
+    - .rspec-ee-base-geo
+    - .use-pg10-ee
+
+rspec-ee unit pg9 geo:
+  extends: .rspec-ee-base-geo-pg9
+  parallel: 2
+
+rspec-ee integration pg9 geo:
+  extends: .rspec-ee-base-geo-pg9
+
+rspec-ee system pg9 geo:
+  extends: .rspec-ee-base-geo-pg9
+
+rspec-ee unit pg10 geo:
+  extends: .rspec-ee-base-geo-pg10
+  parallel: 2
+
+rspec-ee integration pg10 geo:
+  extends: .rspec-ee-base-geo-pg10
+
+rspec-ee system pg10 geo:
+  extends: .rspec-ee-base-geo-pg10
 
 db:rollback geo:
   extends:
     - db:rollback
-    - .only-ee
+    - .rails:rules:ee-only
   script:
     - bundle exec rake geo:db:migrate VERSION=20170627195211
     - bundle exec rake geo:db:migrate
+# ee-only jobs #
+################
diff --git a/app/assets/javascripts/diffs/components/diff_file_row.vue b/app/assets/javascripts/diffs/components/diff_file_row.vue
new file mode 100644
index 00000000000..f41337762fd
--- /dev/null
+++ b/app/assets/javascripts/diffs/components/diff_file_row.vue
@@ -0,0 +1,17 @@
+<script>
+/**
+ * This component is an iterative step towards refactoring and simplifying `vue_shared/components/file_row.vue`
+ * https://gitlab.com/gitlab-org/gitlab/-/merge_requests/23720
+ */
+import FileRow from '~/vue_shared/components/file_row.vue';
+
+export default {
+  components: {
+    FileRow,
+  },
+};
+</script>
+
+<template>
+  <file-row v-bind="$attrs" v-on="$listeners" />
+</template>
diff --git a/app/assets/javascripts/diffs/components/tree_list.vue b/app/assets/javascripts/diffs/components/tree_list.vue
index b13619a5471..18c3002825e 100644
--- a/app/assets/javascripts/diffs/components/tree_list.vue
+++ b/app/assets/javascripts/diffs/components/tree_list.vue
@@ -3,7 +3,8 @@ import { mapActions, mapGetters, mapState } from 'vuex';
 import { GlTooltipDirective } from '@gitlab/ui';
 import { s__, sprintf } from '~/locale';
 import Icon from '~/vue_shared/components/icon.vue';
-import FileRow from '~/vue_shared/components/file_row.vue';
+import FileTree from '~/vue_shared/components/file_tree.vue';
+import DiffFileRow from './diff_file_row.vue';
 import FileRowStats from './file_row_stats.vue';
 
 export default {
@@ -12,7 +13,7 @@ export default {
   },
   components: {
     Icon,
-    FileRow,
+    FileTree,
   },
   props: {
     hideFileStats: {
@@ -61,6 +62,7 @@ export default {
   searchPlaceholder: sprintf(s__('MergeRequest|Search files (%{modifier_key}P)'), {
     modifier_key: /Mac/i.test(navigator.userAgent) ? '⌘' : 'Ctrl+',
   }),
+  DiffFileRow,
 };
 </script>
 
@@ -91,7 +93,7 @@ export default {
     </div>
     <div :class="{ 'pt-0 tree-list-blobs': !renderTreeList }" class="tree-list-scroll">
       <template v-if="filteredTreeList.length">
-        <file-row
+        <file-tree
           v-for="file in filteredTreeList"
           :key="file.key"
           :file="file"
@@ -99,6 +101,7 @@ export default {
           :hide-extra-on-tree="true"
           :extra-component="fileRowExtraComponent"
           :show-changed-icon="true"
+          :file-row-component="$options.DiffFileRow"
           @toggleTreeOpen="toggleTreeOpen"
           @clickFile="scrollToFile"
         />
diff --git a/app/assets/javascripts/ide/components/ide_file_row.vue b/app/assets/javascripts/ide/components/ide_file_row.vue
new file mode 100644
index 00000000000..f41337762fd
--- /dev/null
+++ b/app/assets/javascripts/ide/components/ide_file_row.vue
@@ -0,0 +1,17 @@
+<script>
+/**
+ * This component is an iterative step towards refactoring and simplifying `vue_shared/components/file_row.vue`
+ * https://gitlab.com/gitlab-org/gitlab/-/merge_requests/23720
+ */
+import FileRow from '~/vue_shared/components/file_row.vue';
+
+export default {
+  components: {
+    FileRow,
+  },
+};
+</script>
+
+<template>
+  <file-row v-bind="$attrs" v-on="$listeners" />
+</template>
diff --git a/app/assets/javascripts/ide/components/ide_tree_list.vue b/app/assets/javascripts/ide/components/ide_tree_list.vue
index bacdfc7c05e..151f7f0c421 100644
--- a/app/assets/javascripts/ide/components/ide_tree_list.vue
+++ b/app/assets/javascripts/ide/components/ide_tree_list.vue
@@ -1,7 +1,8 @@
 <script>
 import { mapActions, mapGetters, mapState } from 'vuex';
 import { GlSkeletonLoading } from '@gitlab/ui';
-import FileRow from '~/vue_shared/components/file_row.vue';
+import FileTree from '~/vue_shared/components/file_tree.vue';
+import IdeFileRow from './ide_file_row.vue';
 import NavDropdown from './nav_dropdown.vue';
 import FileRowExtra from './file_row_extra.vue';
 
@@ -9,7 +10,7 @@ export default {
   components: {
     GlSkeletonLoading,
     NavDropdown,
-    FileRow,
+    FileTree,
   },
   props: {
     viewerType: {
@@ -36,6 +37,7 @@ export default {
     ...mapActions(['updateViewer', 'toggleTreeOpen']),
   },
   FileRowExtra,
+  IdeFileRow,
 };
 </script>
 
@@ -53,12 +55,13 @@ export default {
       </header>
       <div class="ide-tree-body h-100">
         <template v-if="currentTree.tree.length">
-          <file-row
+          <file-tree
             v-for="file in currentTree.tree"
             :key="file.key"
             :file="file"
             :level="0"
             :extra-component="$options.FileRowExtra"
+            :file-row-component="$options.IdeFileRow"
             @toggleTreeOpen="toggleTreeOpen"
           />
         </template>
diff --git a/app/assets/javascripts/monitoring/components/panel_type.vue b/app/assets/javascripts/monitoring/components/panel_type.vue
index 0258a62b390..22fab1b03f2 100644
--- a/app/assets/javascripts/monitoring/components/panel_type.vue
+++ b/app/assets/javascripts/monitoring/components/panel_type.vue
@@ -195,8 +195,8 @@ export default {
         </gl-dropdown-item>
         <gl-dropdown-item
           v-if="clipboardText"
+          ref="copyChartLink"
           v-track-event="generateLinkToChartOptions(clipboardText)"
-          class="js-chart-link"
           :data-clipboard-text="clipboardText"
           @click="showToast(clipboardText)"
         >
diff --git a/app/assets/javascripts/vue_shared/components/file_row.vue b/app/assets/javascripts/vue_shared/components/file_row.vue
index 611001df32f..d962f644ff8 100644
--- a/app/assets/javascripts/vue_shared/components/file_row.vue
+++ b/app/assets/javascripts/vue_shared/components/file_row.vue
@@ -62,9 +62,6 @@ export default {
         'is-open': this.file.opened,
       };
     },
-    childFilesLevel() {
-      return this.file.isHeader ? 0 : this.level + 1;
-    },
   },
   watch: {
     'file.active': function fileActiveWatch(active) {
@@ -131,53 +128,38 @@ export default {
 </script>
 
 <template>
-  <div>
-    <file-header v-if="file.isHeader" :path="file.path" />
-    <div
-      v-else
-      :class="fileClass"
-      :title="file.name"
-      class="file-row"
-      role="button"
-      @click="clickFile"
-      @mouseleave="toggleDropdown(false)"
-    >
-      <div class="file-row-name-container">
-        <span ref="textOutput" :style="levelIndentation" class="file-row-name str-truncated">
-          <file-icon
-            v-if="!showChangedIcon || file.type === 'tree'"
-            class="file-row-icon"
-            :file-name="file.name"
-            :loading="file.loading"
-            :folder="isTree"
-            :opened="file.opened"
-            :size="16"
-          />
-          <changed-file-icon v-else :file="file" :size="16" class="append-right-5" />
-          {{ file.name }}
-        </span>
-        <component
-          :is="extraComponent"
-          v-if="extraComponent && !(hideExtraOnTree && file.type === 'tree')"
-          :file="file"
-          :dropdown-open="dropdownOpen"
-          @toggle="toggleDropdown($event)"
+  <file-header v-if="file.isHeader" :path="file.path" />
+  <div
+    v-else
+    :class="fileClass"
+    :title="file.name"
+    class="file-row"
+    role="button"
+    @click="clickFile"
+    @mouseleave="toggleDropdown(false)"
+  >
+    <div class="file-row-name-container">
+      <span ref="textOutput" :style="levelIndentation" class="file-row-name str-truncated">
+        <file-icon
+          v-if="!showChangedIcon || file.type === 'tree'"
+          class="file-row-icon"
+          :file-name="file.name"
+          :loading="file.loading"
+          :folder="isTree"
+          :opened="file.opened"
+          :size="16"
         />
-      </div>
-    </div>
-    <template v-if="file.opened || file.isHeader">
-      <file-row
-        v-for="childFile in file.tree"
-        :key="childFile.key"
-        :file="childFile"
-        :level="childFilesLevel"
-        :hide-extra-on-tree="hideExtraOnTree"
-        :extra-component="extraComponent"
-        :show-changed-icon="showChangedIcon"
-        @toggleTreeOpen="toggleTreeOpen"
-        @clickFile="clickedFile"
+        <changed-file-icon v-else :file="file" :size="16" class="append-right-5" />
+        {{ file.name }}
+      </span>
+      <component
+        :is="extraComponent"
+        v-if="extraComponent && !(hideExtraOnTree && file.type === 'tree')"
+        :file="file"
+        :dropdown-open="dropdownOpen"
+        @toggle="toggleDropdown($event)"
       />
-    </template>
+    </div>
   </div>
 </template>
 
diff --git a/app/assets/javascripts/vue_shared/components/file_tree.vue b/app/assets/javascripts/vue_shared/components/file_tree.vue
new file mode 100644
index 00000000000..e7817b8f910
--- /dev/null
+++ b/app/assets/javascripts/vue_shared/components/file_tree.vue
@@ -0,0 +1,47 @@
+<script>
+export default {
+  name: 'FileTree',
+  props: {
+    fileRowComponent: {
+      type: Object,
+      required: true,
+    },
+    level: {
+      type: Number,
+      required: true,
+    },
+    file: {
+      type: Object,
+      required: true,
+    },
+  },
+  computed: {
+    childFilesLevel() {
+      return this.file.isHeader ? 0 : this.level + 1;
+    },
+  },
+};
+</script>
+
+<template>
+  <div>
+    <component
+      :is="fileRowComponent"
+      :level="level"
+      :file="file"
+      v-bind="$attrs"
+      v-on="$listeners"
+    />
+    <template v-if="file.opened || file.isHeader">
+      <file-tree
+        v-for="childFile in file.tree"
+        :key="childFile.key"
+        :file-row-component="fileRowComponent"
+        :level="childFilesLevel"
+        :file="childFile"
+        v-bind="$attrs"
+        v-on="$listeners"
+      />
+    </template>
+  </div>
+</template>
diff --git a/changelogs/unreleased/remove-issue_link_types.yml b/changelogs/unreleased/remove-issue_link_types.yml
new file mode 100644
index 00000000000..f123327de13
--- /dev/null
+++ b/changelogs/unreleased/remove-issue_link_types.yml
@@ -0,0 +1,5 @@
+---
+title: Expose issue link type in REST API
+merge_request: 24175
+author:
+type: added
diff --git a/db/post_migrate/20191115115522_migrate_epic_notes_mentions_to_db.rb b/db/post_migrate/20191115115522_migrate_epic_notes_mentions_to_db.rb
index e0b3c36b57d..7914ff59dbd 100644
--- a/db/post_migrate/20191115115522_migrate_epic_notes_mentions_to_db.rb
+++ b/db/post_migrate/20191115115522_migrate_epic_notes_mentions_to_db.rb
@@ -14,7 +14,7 @@ class MigrateEpicNotesMentionsToDb < ActiveRecord::Migration[5.2]
   INDEX_NAME = 'epic_mentions_temp_index'
   INDEX_CONDITION = "note LIKE '%@%'::text AND notes.noteable_type = 'Epic'"
   QUERY_CONDITIONS = "#{INDEX_CONDITION} AND epic_user_mentions.epic_id IS NULL"
-  JOIN = 'LEFT JOIN epic_user_mentions ON notes.id = epic_user_mentions.note_id'
+  JOIN = 'INNER JOIN epics ON epics.id = notes.noteable_id LEFT JOIN epic_user_mentions ON notes.id = epic_user_mentions.note_id'
 
   class Note < ActiveRecord::Base
     include EachBatch
diff --git a/doc/administration/logs.md b/doc/administration/logs.md
index 51d5c758084..b98f02ccc98 100644
--- a/doc/administration/logs.md
+++ b/doc/administration/logs.md
@@ -288,10 +288,13 @@ For source installations, edit the `gitlab.yml` and set the Sidekiq
 
 ## `gitlab-shell.log`
 
-This file lives in `/var/log/gitlab/gitlab-shell/gitlab-shell.log` for
-Omnibus GitLab packages or in `/home/git/gitlab-shell/gitlab-shell.log` for
+This file lives in `/var/log/gitlab/gitaly/gitlab-shell.log` for
+Omnibus GitLab packages or in `/home/git/gitaly/gitlab-shell.log` for
 installations from source.
 
+NOTE: **Note**
+For GitLab 12.5 and earlier the file lives in `/var/log/gitlab/gitlab-shell/gitlab-shell.log`.
+
 GitLab Shell is used by GitLab for executing Git commands and provide
 SSH access to Git repositories. For example:
 
diff --git a/doc/api/issue_links.md b/doc/api/issue_links.md
index 941cc0b1347..2a64c2370fc 100644
--- a/doc/api/issue_links.md
+++ b/doc/api/issue_links.md
@@ -67,7 +67,7 @@ POST /projects/:id/issues/:issue_iid/links
 | `issue_iid` | integer | yes      | The internal ID of a project's issue |
 | `target_project_id` | integer/string | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) of a target project  |
 | `target_issue_iid` | integer/string | yes      | The internal ID of a target project's issue |
-| `link_type` | string  | no | The type of the relation ("relates_to", "blocks", "is_blocked_by"), defaults to "relates_to"). Ignored unless `issue_link_types` feature flag is enabled. |
+| `link_type` | string  | no | The type of the relation ("relates_to", "blocks", "is_blocked_by"), defaults to "relates_to"). |
 
 ```shell
 curl --request POST --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/4/issues/1/links?target_project_id=5&target_issue_iid=1"
diff --git a/doc/development/integrations/secure.md.md b/doc/development/integrations/secure.md
index b9b37a7e298..b9b37a7e298 100644
--- a/doc/development/integrations/secure.md.md
+++ b/doc/development/integrations/secure.md
diff --git a/doc/user/permissions.md b/doc/user/permissions.md
index 25672d510c7..41040258e01 100644
--- a/doc/user/permissions.md
+++ b/doc/user/permissions.md
@@ -95,7 +95,7 @@ The following table depicts the various user permission levels in a project.
 | Stop environments                                 |         |            | ✓           | ✓        | ✓      |
 | Add tags                                          |         |            | ✓           | ✓        | ✓      |
 | Cancel and retry jobs                             |         |            | ✓           | ✓        | ✓      |
-| Create or update commit status                    |         |            | ✓           | ✓        | ✓      |
+| Create or update commit status                    |         |            | ✓ (*5*)     | ✓        | ✓      |
 | Update a container registry                       |         |            | ✓           | ✓        | ✓      |
 | Remove a container registry image                 |         |            | ✓           | ✓        | ✓      |
 | Create/edit/delete project milestones             |         |            | ✓           | ✓        | ✓      |
@@ -144,6 +144,7 @@ The following table depicts the various user permission levels in a project.
 (*2*): Guest users can only view the confidential issues they created themselves.  
 (*3*): If **Public pipelines** is enabled in **Project Settings > CI/CD**.  
 (*4*): Not allowed for Guest, Reporter, Developer, Maintainer, or Owner. See [Protected Branches](./project/protected_branches.md).
+(*5*): If the [branch is protected](./project/protected_branches.md#using-the-allowed-to-merge-and-allowed-to-push-settings), this depends on the access Developers and Maintainers are given.
 
 ## Project features permissions
 
diff --git a/lib/gitlab/background_migration/user_mentions/create_resource_user_mention.rb b/lib/gitlab/background_migration/user_mentions/create_resource_user_mention.rb
index 7d40dfbcdc4..40f45301727 100644
--- a/lib/gitlab/background_migration/user_mentions/create_resource_user_mention.rb
+++ b/lib/gitlab/background_migration/user_mentions/create_resource_user_mention.rb
@@ -13,7 +13,7 @@ module Gitlab
 
         def perform(resource_model, join, conditions, with_notes, start_id, end_id)
           resource_model = "#{ISOLATION_MODULE}::#{resource_model}".constantize if resource_model.is_a?(String)
-          model = with_notes ? "#{ISOLATION_MODULE}::Note".constantize : resource_model
+          model = with_notes ? Gitlab::BackgroundMigration::UserMentions::Models::Note : resource_model
           resource_user_mention_model = resource_model.user_mention_model
 
           records = model.joins(join).where(conditions).where(id: start_id..end_id)
@@ -21,7 +21,7 @@ module Gitlab
           records.in_groups_of(BULK_INSERT_SIZE, false).each do |records|
             mentions = []
             records.each do |record|
-              mentions << record.build_mention_values
+              mentions << record.build_mention_values(resource_user_mention_model.resource_foreign_key)
             end
 
             Gitlab::Database.bulk_insert(
diff --git a/lib/gitlab/background_migration/user_mentions/models/concerns/isolated_mentionable.rb b/lib/gitlab/background_migration/user_mentions/models/concerns/isolated_mentionable.rb
index 40aab896212..b7fa92a6686 100644
--- a/lib/gitlab/background_migration/user_mentions/models/concerns/isolated_mentionable.rb
+++ b/lib/gitlab/background_migration/user_mentions/models/concerns/isolated_mentionable.rb
@@ -65,11 +65,11 @@ module Gitlab
             false
           end
 
-          def build_mention_values
+          def build_mention_values(resource_foreign_key)
             refs = all_references(author)
 
             {
-              "#{self.user_mention_model.resource_foreign_key}": user_mention_resource_id,
+              "#{resource_foreign_key}": user_mention_resource_id,
               note_id: user_mention_note_id,
               mentioned_users_ids: array_to_sql(refs.mentioned_users.pluck(:id)),
               mentioned_projects_ids: array_to_sql(refs.mentioned_projects.pluck(:id)),
diff --git a/lib/gitlab/background_migration/user_mentions/models/note.rb b/lib/gitlab/background_migration/user_mentions/models/note.rb
index c2828202907..dc364d7af5a 100644
--- a/lib/gitlab/background_migration/user_mentions/models/note.rb
+++ b/lib/gitlab/background_migration/user_mentions/models/note.rb
@@ -19,10 +19,6 @@ module Gitlab
           belongs_to :noteable, polymorphic: true
           belongs_to :project
 
-          def user_mention_model
-            "#{CreateResourceUserMention::ISOLATION_MODULE}::#{noteable.class}".constantize.user_mention_model
-          end
-
           def for_personal_snippet?
             noteable.class.name == 'PersonalSnippet'
           end
diff --git a/spec/frontend/diffs/components/diff_file_row_spec.js b/spec/frontend/diffs/components/diff_file_row_spec.js
new file mode 100644
index 00000000000..3e95d1d55bd
--- /dev/null
+++ b/spec/frontend/diffs/components/diff_file_row_spec.js
@@ -0,0 +1,25 @@
+import { shallowMount } from '@vue/test-utils';
+import DiffFileRow from '~/diffs/components/diff_file_row.vue';
+import FileRow from '~/vue_shared/components/file_row.vue';
+
+describe('Diff File Row component', () => {
+  let wrapper;
+
+  const createComponent = (props = {}) => {
+    wrapper = shallowMount(DiffFileRow, {
+      propsData: { ...props },
+    });
+  };
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  it('renders file row component', () => {
+    createComponent({
+      level: 4,
+      file: {},
+    });
+    expect(wrapper.find(FileRow).exists()).toEqual(true);
+  });
+});
diff --git a/spec/frontend/ide/components/ide_file_row_spec.js b/spec/frontend/ide/components/ide_file_row_spec.js
new file mode 100644
index 00000000000..7531bc3e144
--- /dev/null
+++ b/spec/frontend/ide/components/ide_file_row_spec.js
@@ -0,0 +1,25 @@
+import { shallowMount } from '@vue/test-utils';
+import IdeFileRow from '~/ide/components/ide_file_row.vue';
+import FileRow from '~/vue_shared/components/file_row.vue';
+
+describe('Ide File Row component', () => {
+  let wrapper;
+
+  const createComponent = (props = {}) => {
+    wrapper = shallowMount(IdeFileRow, {
+      propsData: { ...props },
+    });
+  };
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  it('renders file row component', () => {
+    createComponent({
+      level: 4,
+      file: {},
+    });
+    expect(wrapper.find(FileRow).exists()).toEqual(true);
+  });
+});
diff --git a/spec/frontend/monitoring/components/dashboard_spec.js b/spec/frontend/monitoring/components/dashboard_spec.js
index 70b2c9cf527..7a039d46d39 100644
--- a/spec/frontend/monitoring/components/dashboard_spec.js
+++ b/spec/frontend/monitoring/components/dashboard_spec.js
@@ -1,5 +1,5 @@
 import { shallowMount, createLocalVue, mount } from '@vue/test-utils';
-import { GlDropdownItem, GlButton, GlToast } from '@gitlab/ui';
+import { GlDropdownItem, GlButton } from '@gitlab/ui';
 import VueDraggable from 'vuedraggable';
 import MockAdapter from 'axios-mock-adapter';
 import axios from '~/lib/utils/axios_utils';
@@ -10,6 +10,7 @@ import Dashboard from '~/monitoring/components/dashboard.vue';
 import DateTimePicker from '~/vue_shared/components/date_time_picker/date_time_picker.vue';
 import DashboardsDropdown from '~/monitoring/components/dashboards_dropdown.vue';
 import GroupEmptyState from '~/monitoring/components/group_empty_state.vue';
+import PanelType from 'ee_else_ce/monitoring/components/panel_type.vue';
 import { createStore } from '~/monitoring/stores';
 import * as types from '~/monitoring/stores/mutation_types';
 import { setupComponentStore, propsData } from '../init_utils';
@@ -540,37 +541,36 @@ describe('Dashboard', () => {
     });
   });
 
-  // https://gitlab.com/gitlab-org/gitlab-ce/issues/66922
-  // eslint-disable-next-line jest/no-disabled-tests
-  describe.skip('link to chart', () => {
+  describe('Clipboard text in panels', () => {
     const currentDashboard = 'TEST_DASHBOARD';
-    localVue.use(GlToast);
-    const link = () => wrapper.find('.js-chart-link');
-    const clipboardText = () => link().element.dataset.clipboardText;
+
+    const getClipboardTextAt = i =>
+      wrapper
+        .findAll(PanelType)
+        .at(i)
+        .props('clipboardText');
 
     beforeEach(done => {
       createShallowWrapper({ hasMetrics: true, currentDashboard });
 
-      setTimeout(done);
-    });
+      setupComponentStore(wrapper);
 
-    it('adds a copy button to the dropdown', () => {
-      expect(link().text()).toContain('Generate link to chart');
+      wrapper.vm.$nextTick(done);
     });
 
     it('contains a link to the dashboard', () => {
-      expect(clipboardText()).toContain(`dashboard=${currentDashboard}`);
-      expect(clipboardText()).toContain(`group=`);
-      expect(clipboardText()).toContain(`title=`);
-      expect(clipboardText()).toContain(`y_label=`);
+      expect(getClipboardTextAt(0)).toContain(`dashboard=${currentDashboard}`);
+      expect(getClipboardTextAt(0)).toContain(`group=`);
+      expect(getClipboardTextAt(0)).toContain(`title=`);
+      expect(getClipboardTextAt(0)).toContain(`y_label=`);
     });
 
-    it('undefined parameter is stripped', done => {
+    it('strips the undefined parameter', done => {
       wrapper.setProps({ currentDashboard: undefined });
 
       wrapper.vm.$nextTick(() => {
-        expect(clipboardText()).not.toContain(`dashboard=`);
-        expect(clipboardText()).toContain(`y_label=`);
+        expect(getClipboardTextAt(0)).not.toContain(`dashboard=`);
+        expect(getClipboardTextAt(0)).toContain(`y_label=`);
         done();
       });
     });
@@ -579,18 +579,10 @@ describe('Dashboard', () => {
       wrapper.setProps({ currentDashboard: null });
 
       wrapper.vm.$nextTick(() => {
-        expect(clipboardText()).not.toContain(`dashboard=`);
-        expect(clipboardText()).toContain(`y_label=`);
+        expect(getClipboardTextAt(0)).not.toContain(`dashboard=`);
+        expect(getClipboardTextAt(0)).toContain(`y_label=`);
         done();
       });
     });
-
-    it('creates a toast when clicked', () => {
-      jest.spyOn(wrapper.vm.$toast, 'show').and.stub();
-
-      link().vm.$emit('click');
-
-      expect(wrapper.vm.$toast.show).toHaveBeenCalled();
-    });
   });
 });
diff --git a/spec/frontend/monitoring/panel_type_spec.js b/spec/frontend/monitoring/components/panel_type_spec.js
index 730d67f79d8..6d8bd1d3a30 100644
--- a/spec/frontend/monitoring/panel_type_spec.js
+++ b/spec/frontend/monitoring/components/panel_type_spec.js
@@ -3,22 +3,29 @@ import AxiosMockAdapter from 'axios-mock-adapter';
 import { setTestTimeout } from 'helpers/timeout';
 import invalidUrl from '~/lib/utils/invalid_url';
 import axios from '~/lib/utils/axios_utils';
+
 import PanelType from '~/monitoring/components/panel_type.vue';
 import EmptyChart from '~/monitoring/components/charts/empty_chart.vue';
 import TimeSeriesChart from '~/monitoring/components/charts/time_series.vue';
 import AnomalyChart from '~/monitoring/components/charts/anomaly.vue';
-import { graphDataPrometheusQueryRange } from '../../javascripts/monitoring/mock_data';
-import { anomalyMockGraphData } from '../../frontend/monitoring/mock_data';
+import { anomalyMockGraphData, graphDataPrometheusQueryRange } from 'jest/monitoring/mock_data';
 import { createStore } from '~/monitoring/stores';
 
 global.IS_EE = true;
 global.URL.createObjectURL = jest.fn();
 
+const mocks = {
+  $toast: {
+    show: jest.fn(),
+  },
+};
+
 describe('Panel Type component', () => {
   let axiosMock;
   let store;
   let state;
   let wrapper;
+
   const exampleText = 'example_text';
 
   const createWrapper = props => {
@@ -27,6 +34,7 @@ describe('Panel Type component', () => {
         ...props,
       },
       store,
+      mocks,
     });
   };
 
@@ -88,7 +96,7 @@ describe('Panel Type component', () => {
     });
 
     it('sets no clipboard copy link on dropdown by default', () => {
-      const link = () => wrapper.find('.js-chart-link');
+      const link = () => wrapper.find({ ref: 'copyChartLink' });
       expect(link().exists()).toBe(false);
     });
 
@@ -196,6 +204,7 @@ describe('Panel Type component', () => {
   });
 
   describe('when cliboard data is available', () => {
+    const link = () => wrapper.find({ ref: 'copyChartLink' });
     const clipboardText = 'A value to copy.';
 
     beforeEach(() => {
@@ -210,11 +219,19 @@ describe('Panel Type component', () => {
     });
 
     it('sets clipboard text on the dropdown', () => {
-      const link = () => wrapper.find('.js-chart-link');
-
       expect(link().exists()).toBe(true);
       expect(link().element.dataset.clipboardText).toBe(clipboardText);
     });
+
+    it('adds a copy button to the dropdown', () => {
+      expect(link().text()).toContain('Generate link to chart');
+    });
+
+    it('opens a toast on click', () => {
+      link().vm.$emit('click');
+
+      expect(wrapper.vm.$toast.show).toHaveBeenCalled();
+    });
   });
 
   describe('when downloading metrics data as CSV', () => {
diff --git a/spec/frontend/vue_shared/components/file_tree_spec.js b/spec/frontend/vue_shared/components/file_tree_spec.js
new file mode 100644
index 00000000000..38979d9d844
--- /dev/null
+++ b/spec/frontend/vue_shared/components/file_tree_spec.js
@@ -0,0 +1,88 @@
+import { pick } from 'lodash';
+import { shallowMount } from '@vue/test-utils';
+import FileTree from '~/vue_shared/components/file_tree.vue';
+
+const MockFileRow = {
+  name: 'MockFileRow',
+  render() {
+    return this.$slots.default;
+  },
+};
+
+const TEST_LEVEL = 4;
+const TEST_EXTA_ARGS = {
+  foo: 'lorem-ipsum',
+  bar: 'zoo',
+};
+
+describe('File Tree component', () => {
+  let wrapper;
+
+  const createComponent = (props = {}) => {
+    wrapper = shallowMount(FileTree, {
+      propsData: { level: TEST_LEVEL, fileRowComponent: MockFileRow, ...props },
+      attrs: { ...TEST_EXTA_ARGS },
+    });
+  };
+
+  const findFileRow = () => wrapper.find(MockFileRow);
+  const findChildrenTrees = () => wrapper.findAll(FileTree).wrappers.slice(1);
+  const findChildrenTreeProps = () =>
+    findChildrenTrees().map(x => ({
+      ...x.props(),
+      ...pick(x.attributes(), Object.keys(TEST_EXTA_ARGS)),
+    }));
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  describe('file row component', () => {
+    beforeEach(() => {
+      createComponent({ file: {} });
+    });
+
+    it('renders file row component', () => {
+      expect(findFileRow().exists()).toEqual(true);
+    });
+
+    it('contains the required attribute keys', () => {
+      const fileRow = findFileRow();
+
+      // Checking strings b/c value in attributes are always strings
+      expect(fileRow.attributes()).toEqual({
+        file: {}.toString(),
+        level: TEST_LEVEL.toString(),
+        ...TEST_EXTA_ARGS,
+      });
+    });
+  });
+
+  describe('file tree', () => {
+    const createChildren = () => [{ id: 1 }, { id: 2 }];
+    const createChildrenExpectation = (props = {}) =>
+      createChildren().map(file => ({
+        fileRowComponent: MockFileRow,
+        file,
+        ...TEST_EXTA_ARGS,
+        ...props,
+      }));
+
+    it.each`
+      key           | value    | desc                             | expectedChildren
+      ${'isHeader'} | ${true}  | ${'is shown if file is header'}  | ${createChildrenExpectation({ level: 0 })}
+      ${'opened'}   | ${true}  | ${'is shown if file is open'}    | ${createChildrenExpectation({ level: TEST_LEVEL + 1 })}
+      ${'isHeader'} | ${false} | ${'is hidden if file is header'} | ${[]}
+      ${'opened'}   | ${false} | ${'is hidden if file is open'}   | ${[]}
+    `('$desc', ({ key, value, expectedChildren }) => {
+      createComponent({
+        file: {
+          [key]: value,
+          tree: createChildren(),
+        },
+      });
+
+      expect(findChildrenTreeProps()).toEqual(expectedChildren);
+    });
+  });
+});
diff --git a/spec/javascripts/vue_shared/components/file_row_spec.js b/spec/javascripts/vue_shared/components/file_row_spec.js
index 2d80099fafe..071a09f8b93 100644
--- a/spec/javascripts/vue_shared/components/file_row_spec.js
+++ b/spec/javascripts/vue_shared/components/file_row_spec.js
@@ -19,7 +19,6 @@ describe('File row component', () => {
 
   const findNewDropdown = () => vm.$el.querySelector('.ide-new-btn .dropdown');
   const findNewDropdownButton = () => vm.$el.querySelector('.ide-new-btn .dropdown button');
-  const findFileRow = () => vm.$el.querySelector('.file-row');
 
   it('renders name', () => {
     createComponent({
@@ -42,7 +41,7 @@ describe('File row component', () => {
     });
     spyOn(vm, '$emit').and.stub();
 
-    vm.$el.querySelector('.file-row').click();
+    vm.$el.click();
 
     expect(vm.$emit).toHaveBeenCalledWith('toggleTreeOpen', vm.file.path);
   });
@@ -87,7 +86,7 @@ describe('File row component', () => {
       level: 0,
     });
 
-    expect(vm.$el.querySelector('.js-file-row-header')).not.toBe(null);
+    expect(vm.$el.classList).toContain('js-file-row-header');
   });
 
   describe('new dropdown', () => {
@@ -138,7 +137,7 @@ describe('File row component', () => {
       });
 
       it('closes when row triggers mouseleave', () => {
-        findFileRow().dispatchEvent(new Event('mouseleave'));
+        vm.$el.dispatchEvent(new Event('mouseleave'));
 
         expect(vm.dropdownOpen).toBe(false);
       });
diff --git a/spec/support/shared_examples/lib/gitlab/background_migration/mentions_migration_shared_examples.rb b/spec/support/shared_examples/lib/gitlab/background_migration/mentions_migration_shared_examples.rb
new file mode 100644
index 00000000000..f90e1a1ebab
--- /dev/null
+++ b/spec/support/shared_examples/lib/gitlab/background_migration/mentions_migration_shared_examples.rb
@@ -0,0 +1,82 @@
+# frozen_string_literal: true
+
+shared_examples 'resource mentions migration' do |migration_class, resource_class|
+  it 'migrates resource mentions' do
+    join = migration_class::JOIN
+    conditions = migration_class::QUERY_CONDITIONS
+
+    expect do
+      subject.perform(resource_class.name, join, conditions, false, resource_class.minimum(:id), resource_class.maximum(:id))
+    end.to change { user_mentions.count }.by(1)
+
+    user_mention = user_mentions.last
+    expect(user_mention.mentioned_users_ids.sort).to eq(mentioned_users.pluck(:id).sort)
+    expect(user_mention.mentioned_groups_ids.sort).to eq([group.id])
+    expect(user_mention.mentioned_groups_ids.sort).not_to include(inaccessible_group.id)
+
+    # check that performing the same job twice does not fail and does not change counts
+    expect do
+      subject.perform(resource_class.name, join, conditions, false, resource_class.minimum(:id), resource_class.maximum(:id))
+    end.to change { user_mentions.count }.by(0)
+  end
+end
+
+shared_examples 'resource notes mentions migration' do |migration_class, resource_class|
+  before do
+    note1.becomes(Note).save!
+    note2.becomes(Note).save!
+    note3.becomes(Note).save!
+    # note4.becomes(Note).save(validate: false)
+  end
+
+  it 'migrates mentions from note' do
+    join = migration_class::JOIN
+    conditions = migration_class::QUERY_CONDITIONS
+
+    # there are 4 notes for each noteable_type, but one does not have mentions and
+    # another one's noteable_id points to an inexistent resource
+    expect(notes.where(noteable_type: resource_class.to_s).count).to eq 4
+
+    expect do
+      subject.perform(resource_class.name, join, conditions, true, Note.minimum(:id), Note.maximum(:id))
+    end.to change { user_mentions.count }.by(2)
+
+    # check that the user_mention for regular note is created
+    user_mention = user_mentions.first
+    expect(Note.find(user_mention.note_id).system).to be false
+    expect(user_mention.mentioned_users_ids.sort).to eq(users.pluck(:id).sort)
+    expect(user_mention.mentioned_groups_ids.sort).to eq([group.id])
+    expect(user_mention.mentioned_groups_ids.sort).not_to include(inaccessible_group.id)
+
+    # check that the user_mention for system note is created
+    user_mention = user_mentions.second
+    expect(Note.find(user_mention.note_id).system).to be true
+    expect(user_mention.mentioned_users_ids.sort).to eq(users.pluck(:id).sort)
+    expect(user_mention.mentioned_groups_ids.sort).to eq([group.id])
+    expect(user_mention.mentioned_groups_ids.sort).not_to include(inaccessible_group.id)
+
+    # check that performing the same job twice does not fail and does not change counts
+    expect do
+      subject.perform(resource_class.name, join, conditions, true, Note.minimum(:id), Note.maximum(:id))
+    end.to change { user_mentions.count }.by(0)
+  end
+end
+
+shared_examples 'schedules resource mentions migration' do |resource_class, is_for_notes|
+  it 'schedules background migrations' do
+    Sidekiq::Testing.fake! do
+      Timecop.freeze do
+        migrate!
+
+        migration = described_class::MIGRATION
+        join = described_class::JOIN
+        conditions = described_class::QUERY_CONDITIONS
+
+        expect(migration).to be_scheduled_delayed_migration(2.minutes, resource_class.name, join, conditions, is_for_notes, resource1.id, resource1.id)
+        expect(migration).to be_scheduled_delayed_migration(4.minutes, resource_class.name, join, conditions, is_for_notes, resource2.id, resource2.id)
+        expect(migration).to be_scheduled_delayed_migration(6.minutes, resource_class.name, join, conditions, is_for_notes, resource3.id, resource3.id)
+        expect(BackgroundMigrationWorker.jobs.size).to eq 3
+      end
+    end
+  end
+end