diff --git a/README.md b/README.md
index b3b66959884..1372e47d52f 100644
--- a/README.md
+++ b/README.md
@@ -82,9 +82,9 @@ GitLab is a Ruby on Rails application that runs on the following software:
 - Ruby (MRI) 2.6.5
 - Git 2.8.4+
 - Redis 2.8+
-- PostgreSQL (preferred) or MySQL
+- PostgreSQL 9.6+
 
-For more information please see the [architecture documentation](https://docs.gitlab.com/ce/development/architecture.html).
+For more information please see the [architecture](https://docs.gitlab.com/ee/development/architecture.html) and [requirements](https://docs.gitlab.com/ee/install/requirements.html) documentation.
 
 ## UX design
 
diff --git a/app/assets/javascripts/environments/components/enable_review_app_button.vue b/app/assets/javascripts/environments/components/enable_review_app_button.vue
new file mode 100644
index 00000000000..2f9e9cb628f
--- /dev/null
+++ b/app/assets/javascripts/environments/components/enable_review_app_button.vue
@@ -0,0 +1,107 @@
+<script>
+import { GlButton, GlModal, GlModalDirective, GlLink, GlSprintf } from '@gitlab/ui';
+import ModalCopyButton from '~/vue_shared/components/modal_copy_button.vue';
+import { s__ } from '~/locale';
+
+export default {
+  components: {
+    GlButton,
+    GlLink,
+    GlModal,
+    GlSprintf,
+    ModalCopyButton,
+  },
+  directives: {
+    'gl-modal': GlModalDirective,
+  },
+  instructionText: {
+    step1: s__(
+      'EnableReviewApp|%{stepStart}Step 1%{stepEnd}. Ensure you have Kubernetes set up and have a base domain for your %{linkStart}cluster%{linkEnd}.',
+    ),
+    step2: s__('EnableReviewApp|%{stepStart}Step 2%{stepEnd}. Copy the following snippet:'),
+    step3: s__(
+      `EnableReviewApp|%{stepStart}Step 3%{stepEnd}. Add it to the project %{linkStart}gitlab-ci.yml%{linkEnd} file.`,
+    ),
+  },
+  modalInfo: {
+    closeText: s__('EnableReviewApp|Close'),
+    copyToClipboardText: s__('EnableReviewApp|Copy snippet text'),
+    copyString: `deploy_review
+  stage: deploy
+  script:
+    - echo "Deploy a review app"
+  environment:
+    name: review/$CI_COMMIT_REF_NAME
+    url: https://$CI_ENVIRONMENT_SLUG.example.com
+  only: branches
+  except: master`,
+    id: 'enable-review-app-info',
+    title: s__('ReviewApp|Enable Review App'),
+  },
+};
+</script>
+<template>
+  <div>
+    <gl-button
+      v-gl-modal="$options.modalInfo.id"
+      variant="info"
+      category="secondary"
+      type="button"
+      class="js-enable-review-app-button"
+    >
+      {{ s__('Environments|Enable review app') }}
+    </gl-button>
+    <gl-modal
+      :modal-id="$options.modalInfo.id"
+      :title="$options.modalInfo.title"
+      size="lg"
+      class="text-2 ws-normal"
+      ok-only
+      ok-variant="light"
+      :ok-title="$options.modalInfo.closeText"
+    >
+      <p>
+        <gl-sprintf :message="$options.instructionText.step1">
+          <template #step="{ content }">
+            <strong>{{ content }}</strong>
+          </template>
+          <template #link="{ content }">
+            <gl-link
+              href="https://docs.gitlab.com/ee/user/project/clusters/add_remove_clusters.html"
+              target="_blank"
+              >{{ content }}</gl-link
+            >
+          </template>
+        </gl-sprintf>
+      </p>
+      <div>
+        <p>
+          <gl-sprintf :message="$options.instructionText.step2">
+            <template #step="{ content }">
+              <strong>{{ content }}</strong>
+            </template>
+          </gl-sprintf>
+        </p>
+        <div class="flex align-items-start">
+          <pre class="w-100"> {{ $options.modalInfo.copyString }} </pre>
+          <modal-copy-button
+            :title="$options.modalInfo.copyToClipboardText"
+            :text="$options.modalInfo.copyString"
+            :modal-id="$options.modalInfo.id"
+            css-classes="border-0"
+          />
+        </div>
+      </div>
+      <p>
+        <gl-sprintf :message="$options.instructionText.step3">
+          <template #step="{ content }">
+            <strong>{{ content }}</strong>
+          </template>
+          <template #link="{ content }">
+            <gl-link href="blob/master/.gitlab-ci.yml" target="_blank">{{ content }}</gl-link>
+          </template>
+        </gl-sprintf>
+      </p>
+    </gl-modal>
+  </div>
+</template>
diff --git a/app/assets/javascripts/environments/components/environments_app.vue b/app/assets/javascripts/environments/components/environments_app.vue
index 50c667e6966..07b8d20fde0 100644
--- a/app/assets/javascripts/environments/components/environments_app.vue
+++ b/app/assets/javascripts/environments/components/environments_app.vue
@@ -1,19 +1,23 @@
 <script>
+import { GlButton } from '@gitlab/ui';
 import envrionmentsAppMixin from 'ee_else_ce/environments/mixins/environments_app_mixin';
-import Flash from '../../flash';
-import { s__ } from '../../locale';
+import Flash from '~/flash';
+import { s__ } from '~/locale';
 import emptyState from './empty_state.vue';
 import eventHub from '../event_hub';
 import environmentsMixin from '../mixins/environments_mixin';
-import CIPaginationMixin from '../../vue_shared/mixins/ci_pagination_api_mixin';
+import CIPaginationMixin from '~/vue_shared/mixins/ci_pagination_api_mixin';
+import EnableReviewAppButton from './enable_review_app_button.vue';
 import StopEnvironmentModal from './stop_environment_modal.vue';
 import ConfirmRollbackModal from './confirm_rollback_modal.vue';
 
 export default {
   components: {
-    emptyState,
-    StopEnvironmentModal,
     ConfirmRollbackModal,
+    emptyState,
+    EnableReviewAppButton,
+    GlButton,
+    StopEnvironmentModal,
   },
 
   mixins: [CIPaginationMixin, environmentsMixin, envrionmentsAppMixin],
@@ -96,10 +100,16 @@ export default {
     <div class="top-area">
       <tabs :tabs="tabs" scope="environments" @onChangeTab="onChangeTab" />
 
-      <div v-if="canCreateEnvironment && !isLoading" class="nav-controls">
-        <a :href="newEnvironmentPath" class="btn btn-success">
+      <div class="nav-controls">
+        <enable-review-app-button v-if="state.reviewAppDetails.can_setup_review_app" class="mr-2" />
+        <gl-button
+          v-if="canCreateEnvironment && !isLoading"
+          :href="newEnvironmentPath"
+          category="primary"
+          variant="success"
+        >
           {{ s__('Environments|New environment') }}
-        </a>
+        </gl-button>
       </div>
     </div>
 
diff --git a/app/assets/javascripts/environments/mixins/environments_mixin.js b/app/assets/javascripts/environments/mixins/environments_mixin.js
index 34374e306a4..1c5884b541c 100644
--- a/app/assets/javascripts/environments/mixins/environments_mixin.js
+++ b/app/assets/javascripts/environments/mixins/environments_mixin.js
@@ -52,6 +52,7 @@ export default {
         this.store.storeAvailableCount(resp.data.available_count);
         this.store.storeStoppedCount(resp.data.stopped_count);
         this.store.storeEnvironments(resp.data.environments);
+        this.store.setReviewAppDetails(resp.data.review_app);
         this.store.setPagination(resp.headers);
       }
     },
diff --git a/app/assets/javascripts/environments/stores/environments_store.js b/app/assets/javascripts/environments/stores/environments_store.js
index 81c257acd53..6b7c1ff627d 100644
--- a/app/assets/javascripts/environments/stores/environments_store.js
+++ b/app/assets/javascripts/environments/stores/environments_store.js
@@ -14,6 +14,7 @@ export default class EnvironmentsStore {
     this.state.stoppedCounter = 0;
     this.state.availableCounter = 0;
     this.state.paginationInformation = {};
+    this.state.reviewAppDetails = {};
 
     return this;
   }
@@ -104,6 +105,11 @@ export default class EnvironmentsStore {
     return paginationInformation;
   }
 
+  setReviewAppDetails(details = {}) {
+    this.state.reviewAppDetails = details;
+    return details;
+  }
+
   /**
    * Stores the number of available environments.
    *
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 7cb629dee21..fa88ca91170 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -37,7 +37,6 @@ class ApplicationController < ActionController::Base
   around_action :set_current_context
   around_action :set_locale
   around_action :set_session_storage
-  around_action :set_current_admin
 
   after_action :set_page_title_header, if: :json_request?
   after_action :limit_session_time, if: -> { !current_user }
@@ -474,13 +473,6 @@ class ApplicationController < ActionController::Base
     response.headers['Page-Title'] = URI.escape(page_title('GitLab'))
   end
 
-  def set_current_admin(&block)
-    return yield unless Feature.enabled?(:user_mode_in_session)
-    return yield unless current_user
-
-    Gitlab::Auth::CurrentUserMode.with_current_admin(current_user, &block)
-  end
-
   def html_request?
     request.format.html?
   end
diff --git a/changelogs/unreleased/118844-one-button-review-app-fe.yml b/changelogs/unreleased/118844-one-button-review-app-fe.yml
new file mode 100644
index 00000000000..f7a3cf6dd72
--- /dev/null
+++ b/changelogs/unreleased/118844-one-button-review-app-fe.yml
@@ -0,0 +1,5 @@
+---
+title: Create conditional Enable Review App button
+merge_request: 23703
+author:
+type: added
diff --git a/changelogs/unreleased/36675-add-median-line-to-cycle-analytics-duration-chart.yml b/changelogs/unreleased/36675-add-median-line-to-cycle-analytics-duration-chart.yml
new file mode 100644
index 00000000000..f9ca6b1a2d2
--- /dev/null
+++ b/changelogs/unreleased/36675-add-median-line-to-cycle-analytics-duration-chart.yml
@@ -0,0 +1,5 @@
+---
+title: Add cycle analytics duration chart with median line
+merge_request: 23971
+author:
+type: added
diff --git a/changelogs/unreleased/refactor-admin-mode-in-sidekiq-jobs.yml b/changelogs/unreleased/refactor-admin-mode-in-sidekiq-jobs.yml
deleted file mode 100644
index 37e34b3174c..00000000000
--- a/changelogs/unreleased/refactor-admin-mode-in-sidekiq-jobs.yml
+++ /dev/null
@@ -1,5 +0,0 @@
----
-title: Admin mode support in sidekiq jobs
-merge_request: 21792
-author: Diego Louzán
-type: changed
diff --git a/doc/development/code_review.md b/doc/development/code_review.md
index 9b82cf5ff99..3d41ff64380 100644
--- a/doc/development/code_review.md
+++ b/doc/development/code_review.md
@@ -347,6 +347,12 @@ reviewee.
   of the contributed code. It's usually a good idea to ask another maintainer or
   reviewer before doing it, but have the courage to do it when you believe it is
   important.
+- In the interest of [Iteration](https://about.gitlab.com/handbook/values/#iteration),
+  if, as a reviewer, your suggestions are non-blocking changes or personal preference
+  (not a documented or agreed requirement), consider approving the merge request
+  before passing it back to the author. This allows them to implement your suggestions
+  if they agree, or allows them to pass it onto the
+  maintainer for review straight away. This can help reduce our overall time-to-merge.
 - There is a difference in doing things right and doing things right now.
   Ideally, we should do the former, but in the real world we need the latter as
   well. A good example is a security fix which should be released as soon as
diff --git a/doc/development/migration_style_guide.md b/doc/development/migration_style_guide.md
index cccea4ee9f4..209fa5d610e 100644
--- a/doc/development/migration_style_guide.md
+++ b/doc/development/migration_style_guide.md
@@ -379,10 +379,6 @@ Rails migration example:
 
 ```ruby
 add_column_with_default(:projects, :foo, :integer, default: 10, limit: 8)
-
-# or
-
-add_column(:projects, :foo, :integer, default: 10, limit: 8)
 ```
 
 ## Timestamp column type
diff --git a/doc/development/reactive_caching.md b/doc/development/reactive_caching.md
new file mode 100644
index 00000000000..de93a5aa1d0
--- /dev/null
+++ b/doc/development/reactive_caching.md
@@ -0,0 +1,276 @@
+# `ReactiveCaching`
+
+> This doc refers to <https://gitlab.com/gitlab-org/gitlab/blob/master/app/models/concerns/reactive_caching.rb>.
+
+The `ReactiveCaching` concern is used for fetching some data in the background and store it
+in the Rails cache, keeping it up-to-date for as long as it is being requested.  If the
+data hasn't been requested for `reactive_cache_lifetime`, it will stop being refreshed,
+and then be removed.
+
+## Examples
+
+```ruby
+class Foo < ApplicationRecord
+  include ReactiveCaching
+
+  after_save :clear_reactive_cache!
+
+  def calculate_reactive_cache(param1, param2)
+    # Expensive operation here. The return value of this method is cached
+  end
+
+  def result
+    # Any arguments can be passed to `with_reactive_cache`. `calculate_reactive_cache`
+    # will be called with the same arguments.
+    with_reactive_cache(param1, param2) do |data|
+      # ...
+    end
+  end
+end
+```
+
+In this example, the first time `#result` is called, it will return `nil`. However,
+it will enqueue a background worker to call `#calculate_reactive_cache` and set an
+initial cache lifetime of 10 min.
+
+## How it works
+
+The first time `#with_reactive_cache` is called, a background job is enqueued and
+`with_reactive_cache` returns `nil`. The background job calls `#calculate_reactive_cache`
+and stores its return value. It also re-enqueues the background job to run again after
+`reactive_cache_refresh_interval`. Therefore, it will keep the stored value up to date.
+Calculations never run concurrently.
+
+Calling `#with_reactive_cache` while a value is cached will call the block given to
+`#with_reactive_cache`, yielding the cached value. It will also extend the lifetime
+of the cache by the `reactive_cache_lifetime` value.
+
+Once the lifetime has expired, no more background jobs will be enqueued and calling
+`#with_reactive_cache` will again return `nil` - starting the process all over again.
+
+## When to use
+
+- If we need to make a request to an external API (for example, requests to the k8s API).
+It is not advisable to keep the application server worker blocked for the duration of
+the external request.
+- If a model needs to perform a lot of database calls or other time consuming
+calculations.
+
+## How to use
+
+### In models and services
+
+The ReactiveCaching concern can be used in models as well as `project_services`
+(`app/models/project_services`).
+
+1. Include the concern in your model or service.
+
+   When including in a model:
+
+   ```ruby
+   include ReactiveCaching
+   ```
+
+   or when including in a `project_service`:
+
+   ```ruby
+   include ReactiveService
+   ```
+
+1. Implement the `calculate_reactive_cache` method in your model/service.
+1. Call `with_reactive_cache` in your model/service where the cached value is needed.
+
+### In controllers
+
+Controller endpoints that call a model or service method that uses `ReactiveCaching` should
+not wait until the background worker completes.
+
+- An API that calls a model or service method that uses `ReactiveCaching` should return
+`202 accepted` when the cache is being calculated (when `#with_reactive_cache` returns `nil`).
+- It should also
+[set the polling interval header](fe_guide/performance.md#realtime-components) with
+`Gitlab::PollingInterval.set_header`.
+- The consumer of the API is expected to poll the API.
+- You can also consider implementing [ETag caching](polling.md) to reduce the server
+load caused by polling.
+
+### Methods to implement in a model or service
+
+These are methods that should be implemented in the model/service that includes `ReactiveCaching`.
+
+#### `#calculate_reactive_cache` (required)
+
+- This method must be implemented. Its return value will be cached.
+- It will be called by `ReactiveCaching` when it needs to populate the cache.
+- Any arguments passed to `with_reactive_cache` will also be passed to `calculate_reactive_cache`.
+
+#### `#reactive_cache_updated` (optional)
+
+- This method can be implemented if needed.
+- It is called by the `ReactiveCaching` concern whenever the cache is updated.
+If the cache is being refreshed and the new cache value is the same as the old cache
+value, this method will not be called. It is only called if a new value is stored in
+the cache.
+- It can be used to perform an action whenever the cache is updated.
+
+### Methods called by a model or service
+
+These are methods provided by `ReactiveCaching` and should be called in
+the model/service.
+
+#### `#with_reactive_cache` (required)
+
+- `with_reactive_cache` must be called where the result of `calculate_reactive_cache`
+is required.
+- A block can be given to `with_reactive_cache`. `with_reactive_cache` can also take
+any number of arguments. Any arguments passed to `with_reactive_cache` will be
+passed to `calculate_reactive_cache`. The arguments passed to `with_reactive_cache`
+will be appended to the cache key name.
+- If `with_reactive_cache` is called when the result has already been cached, the
+block will be called, yielding the cached value and the return value of the block
+will be returned by `with_reactive_cache`. It will also reset the timeout of the
+cache to the `reactive_cache_lifetime` value.
+- If the result has not been cached as yet, `with_reactive_cache` will return nil.
+It will also enqueue a background job, which will call `calculate_reactive_cache`
+and cache the result.
+- Once the background job has completed and the result is cached, the next call
+to `with_reactive_cache` will pick up the cached value.
+- In the example below, `data` is the cached value which is yielded to the block
+given to `with_reactive_cache`.
+
+  ```ruby
+  class Foo < ApplicationRecord
+    include ReactiveCaching
+
+    def calculate_reactive_cache(param1, param2)
+      # Expensive operation here. The return value of this method is cached
+    end
+
+    def result
+      with_reactive_cache(param1, param2) do |data|
+        # ...
+      end
+    end
+  end
+  ```
+
+#### `#clear_reactive_cache!` (optional)
+
+- This method can be called when the cache needs to be expired/cleared. For example,
+it can be called in an `after_save` callback in a model so that the cache is
+cleared after the model is modified.
+- This method should be called with the same parameters that are passed to
+`with_reactive_cache` because the parameters are part of the cache key.
+
+#### `#without_reactive_cache` (optional)
+
+- This is a convenience method that can be used for debugging purposes.
+- This method calls `calculate_reactive_cache` in the current process instead of
+in a background worker.
+
+### Configurable options
+
+There are some `class_attribute` options which can be tweaked.
+
+#### `self.reactive_cache_key`
+
+- The value of this attribute is the prefix to the `data` and `alive` cache key names.
+The parameters passed to `with_reactive_cache` form the rest of the cache key names.
+- By default, this key uses the model's name and the ID of the record.
+
+  ```ruby
+  self.reactive_cache_key = -> (record) { [model_name.singular, record.id] }
+  ```
+
+- The `data` and `alive` cache keys in this case will be `"ExampleModel:1:arg1:arg2"`
+and `"ExampleModel:1:arg1:arg2:alive"` respectively, where `ExampleModel` is the
+name of the model, `1` is the ID of the record, `arg1` and `arg2` are parameters
+passed to `with_reactive_cache`.
+- If you're including this concern in a service instead, you will need to override
+the default by adding the following to your service:
+
+  ```ruby
+  self.reactive_cache_key = ->(service) { [service.class.model_name.singular, service.project_id] }
+  ```
+
+  If your reactive_cache_key is exactly like the above, you can use the existing
+  `ReactiveService` concern instead.
+
+#### `self.reactive_cache_lease_timeout`
+
+- `ReactiveCaching` uses `Gitlab::ExclusiveLease` to ensure that the cache calculation
+is never run concurrently by multiple workers.
+- This attribute is the timeout for the `Gitlab::ExclusiveLease`.
+- It defaults to 2 minutes, but can be overriden if a different timeout is required.
+
+```ruby
+self.reactive_cache_lease_timeout = 2.minutes
+```
+
+#### `self.reactive_cache_refresh_interval`
+
+- This is the interval at which the cache is refreshed.
+- It defaults to 1 minute.
+
+```ruby
+self.reactive_cache_lease_timeout = 1.minute
+```
+
+#### `self.reactive_cache_lifetime`
+
+- This is the duration after which the cache will be cleared if there are no requests.
+- The default is 10 minutes. If there are no requests for this cache value for 10 minutes,
+the cache will expire.
+- If the cache value is requested before it expires, the timeout of the cache will
+be reset to `reactive_cache_lifetime`.
+
+```ruby
+self.reactive_cache_lifetime = 10.minutes
+```
+
+#### `self.reactive_cache_worker_finder`
+
+- This is the method used by the background worker to find or generate the object on
+which `calculate_reactive_cache` can be called.
+- By default it uses the model primary key to find the object:
+
+  ```ruby
+  self.reactive_cache_worker_finder = ->(id, *_args) do
+    find_by(primary_key => id)
+  end
+  ```
+
+- The default behaviour can be overridden by defining a custom `reactive_cache_worker_finder`.
+
+  ```ruby
+  class Foo < ApplicationRecord
+    include ReactiveCaching
+
+    self.reactive_cache_worker_finder = ->(_id, *args) { from_cache(*args) }
+
+    def self.from_cache(var1, var2)
+      # This method will be called by the background worker with "bar1" and
+      # "bar2" as arguments.
+      new(var1, var2)
+    end
+
+    def initialize(var1, var2)
+      # ...
+    end
+
+    def calculate_reactive_cache(var1, var2)
+      # Expensive operation here. The return value of this method is cached
+    end
+
+    def result
+      with_reactive_cache("bar1", "bar2") do |data|
+        # ...
+      end
+    end
+  end
+  ```
+
+  - In this example, the primary key ID will be passed to `reactive_cache_worker_finder`
+  along with the parameters passed to `with_reactive_cache`.
+  - The custom `reactive_cache_worker_finder` calls `.from_cache` with the parameters
+  passed to `with_reactive_cache`.
diff --git a/doc/development/utilities.md b/doc/development/utilities.md
index 561d5efc696..dfdc5c66114 100644
--- a/doc/development/utilities.md
+++ b/doc/development/utilities.md
@@ -196,277 +196,4 @@ end
 
 ## `ReactiveCaching`
 
-> This doc refers to <https://gitlab.com/gitlab-org/gitlab/blob/master/app/models/concerns/reactive_caching.rb>.
-
-The `ReactiveCaching` concern is used for fetching some data in the background and store it
-in the Rails cache, keeping it up-to-date for as long as it is being requested.  If the
-data hasn't been requested for `reactive_cache_lifetime`, it will stop being refreshed,
-and then be removed.
-
-### Examples
-
-```ruby
-class Foo < ApplicationRecord
-  include ReactiveCaching
-
-  after_save :clear_reactive_cache!
-
-  def calculate_reactive_cache(param1, param2)
-    # Expensive operation here. The return value of this method is cached
-  end
-
-  def result
-    # Any arguments can be passed to `with_reactive_cache`. `calculate_reactive_cache`
-    # will be called with the same arguments.
-    with_reactive_cache(param1, param2) do |data|
-      # ...
-    end
-  end
-end
-```
-
-In this example, the first time `#result` is called, it will return `nil`. However,
-it will enqueue a background worker to call `#calculate_reactive_cache` and set an
-initial cache lifetime of 10 min.
-
-### How it works
-
-The first time `#with_reactive_cache` is called, a background job is enqueued and
-`with_reactive_cache` returns `nil`. The background job calls `#calculate_reactive_cache`
-and stores its return value. It also re-enqueues the background job to run again after
-`reactive_cache_refresh_interval`. Therefore, it will keep the stored value up to date.
-Calculations never run concurrently.
-
-Calling `#with_reactive_cache` while a value is cached will call the block given to
-`#with_reactive_cache`, yielding the cached value. It will also extend the lifetime
-of the cache by the `reactive_cache_lifetime` value.
-
-Once the lifetime has expired, no more background jobs will be enqueued and calling
-`#with_reactive_cache` will again return `nil` - starting the process all over again.
-
-### When to use
-
-- If we need to make a request to an external API (for example, requests to the k8s API).
-It is not advisable to keep the application server worker blocked for the duration of
-the external request.
-- If a model needs to perform a lot of database calls or other time consuming
-calculations.
-
-### How to use
-
-#### In models and services
-
-The ReactiveCaching concern can be used in models as well as `project_services`
-(`app/models/project_services`).
-
-1. Include the concern in your model or service.
-
-   When including in a model:
-
-   ```ruby
-   include ReactiveCaching
-   ```
-
-   or when including in a `project_service`:
-
-   ```ruby
-   include ReactiveService
-   ```
-
-1. Implement the `calculate_reactive_cache` method in your model/service.
-1. Call `with_reactive_cache` in your model/service where the cached value is needed.
-
-#### In controllers
-
-Controller endpoints that call a model or service method that uses `ReactiveCaching` should
-not wait until the background worker completes.
-
-- An API that calls a model or service method that uses `ReactiveCaching` should return
-`202 accepted` when the cache is being calculated (when `#with_reactive_cache` returns `nil`).
-- It should also
-[set the polling interval header](fe_guide/performance.md#realtime-components) with
-`Gitlab::PollingInterval.set_header`.
-- The consumer of the API is expected to poll the API.
-- You can also consider implementing [ETag caching](polling.md) to reduce the server
-load caused by polling.
-
-#### Methods to implement in a model or service
-
-These are methods that should be implemented in the model/service that includes `ReactiveCaching`.
-
-##### `#calculate_reactive_cache` (required)
-
-- This method must be implemented. Its return value will be cached.
-- It will be called by `ReactiveCaching` when it needs to populate the cache.
-- Any arguments passed to `with_reactive_cache` will also be passed to `calculate_reactive_cache`.
-
-##### `#reactive_cache_updated` (optional)
-
-- This method can be implemented if needed.
-- It is called by the `ReactiveCaching` concern whenever the cache is updated.
-If the cache is being refreshed and the new cache value is the same as the old cache
-value, this method will not be called. It is only called if a new value is stored in
-the cache.
-- It can be used to perform an action whenever the cache is updated.
-
-#### Methods called by a model or service
-
-These are methods provided by `ReactiveCaching` and should be called in
-the model/service.
-
-##### `#with_reactive_cache` (required)
-
-- `with_reactive_cache` must be called where the result of `calculate_reactive_cache`
-is required.
-- A block can be given to `with_reactive_cache`. `with_reactive_cache` can also take
-any number of arguments. Any arguments passed to `with_reactive_cache` will be
-passed to `calculate_reactive_cache`. The arguments passed to `with_reactive_cache`
-will be appended to the cache key name.
-- If `with_reactive_cache` is called when the result has already been cached, the
-block will be called, yielding the cached value and the return value of the block
-will be returned by `with_reactive_cache`. It will also reset the timeout of the
-cache to the `reactive_cache_lifetime` value.
-- If the result has not been cached as yet, `with_reactive_cache` will return nil.
-It will also enqueue a background job, which will call `calculate_reactive_cache`
-and cache the result.
-- Once the background job has completed and the result is cached, the next call
-to `with_reactive_cache` will pick up the cached value.
-- In the example below, `data` is the cached value which is yielded to the block
-given to `with_reactive_cache`.
-
-  ```ruby
-  class Foo < ApplicationRecord
-    include ReactiveCaching
-
-    def calculate_reactive_cache(param1, param2)
-      # Expensive operation here. The return value of this method is cached
-    end
-
-    def result
-      with_reactive_cache(param1, param2) do |data|
-        # ...
-      end
-    end
-  end
-  ```
-
-##### `#clear_reactive_cache!` (optional)
-
-- This method can be called when the cache needs to be expired/cleared. For example,
-it can be called in an `after_save` callback in a model so that the cache is
-cleared after the model is modified.
-- This method should be called with the same parameters that are passed to
-`with_reactive_cache` because the parameters are part of the cache key.
-
-##### `#without_reactive_cache` (optional)
-
-- This is a convenience method that can be used for debugging purposes.
-- This method calls `calculate_reactive_cache` in the current process instead of
-in a background worker.
-
-#### Configurable options
-
-There are some `class_attribute` options which can be tweaked.
-
-##### `self.reactive_cache_key`
-
-- The value of this attribute is the prefix to the `data` and `alive` cache key names.
-The parameters passed to `with_reactive_cache` form the rest of the cache key names.
-- By default, this key uses the model's name and the ID of the record.
-
-  ```ruby
-  self.reactive_cache_key = -> (record) { [model_name.singular, record.id] }
-  ```
-
-- The `data` and `alive` cache keys in this case will be `"ExampleModel:1:arg1:arg2"`
-and `"ExampleModel:1:arg1:arg2:alive"` respectively, where `ExampleModel` is the
-name of the model, `1` is the ID of the record, `arg1` and `arg2` are parameters
-passed to `with_reactive_cache`.
-- If you're including this concern in a service instead, you will need to override
-the default by adding the following to your service:
-
-  ```ruby
-  self.reactive_cache_key = ->(service) { [service.class.model_name.singular, service.project_id] }
-  ```
-
-  If your reactive_cache_key is exactly like the above, you can use the existing
-  `ReactiveService` concern instead.
-
-##### `self.reactive_cache_lease_timeout`
-
-- `ReactiveCaching` uses `Gitlab::ExclusiveLease` to ensure that the cache calculation
-is never run concurrently by multiple workers.
-- This attribute is the timeout for the `Gitlab::ExclusiveLease`.
-- It defaults to 2 minutes, but can be overriden if a different timeout is required.
-
-```ruby
-self.reactive_cache_lease_timeout = 2.minutes
-```
-
-##### `self.reactive_cache_refresh_interval`
-
-- This is the interval at which the cache is refreshed.
-- It defaults to 1 minute.
-
-```ruby
-self.reactive_cache_lease_timeout = 1.minute
-```
-
-##### `self.reactive_cache_lifetime`
-
-- This is the duration after which the cache will be cleared if there are no requests.
-- The default is 10 minutes. If there are no requests for this cache value for 10 minutes,
-the cache will expire.
-- If the cache value is requested before it expires, the timeout of the cache will
-be reset to `reactive_cache_lifetime`.
-
-```ruby
-self.reactive_cache_lifetime = 10.minutes
-```
-
-##### `self.reactive_cache_worker_finder`
-
-- This is the method used by the background worker to find or generate the object on
-which `calculate_reactive_cache` can be called.
-- By default it uses the model primary key to find the object:
-
-  ```ruby
-  self.reactive_cache_worker_finder = ->(id, *_args) do
-    find_by(primary_key => id)
-  end
-  ```
-
-- The default behaviour can be overridden by defining a custom `reactive_cache_worker_finder`.
-
-  ```ruby
-  class Foo < ApplicationRecord
-    include ReactiveCaching
-
-    self.reactive_cache_worker_finder = ->(_id, *args) { from_cache(*args) }
-
-    def self.from_cache(var1, var2)
-      # This method will be called by the background worker with "bar1" and
-      # "bar2" as arguments.
-      new(var1, var2)
-    end
-
-    def initialize(var1, var2)
-      # ...
-    end
-
-    def calculate_reactive_cache(var1, var2)
-      # Expensive operation here. The return value of this method is cached
-    end
-
-    def result
-      with_reactive_cache("bar1", "bar2") do |data|
-        # ...
-      end
-    end
-  end
-  ```
-
-  - In this example, the primary key ID will be passed to `reactive_cache_worker_finder`
-  along with the parameters passed to `with_reactive_cache`.
-  - The custom `reactive_cache_worker_finder` calls `.from_cache` with the parameters
-  passed to `with_reactive_cache`.
+Read the documentation on [`ReactiveCaching`](reactive_caching.md).
diff --git a/doc/user/analytics/cycle_analytics.md b/doc/user/analytics/cycle_analytics.md
index e0bb4e03c41..8d3eaade759 100644
--- a/doc/user/analytics/cycle_analytics.md
+++ b/doc/user/analytics/cycle_analytics.md
@@ -172,16 +172,23 @@ For example, if 30 days worth of data has been selected (for example, 2019-12-16
 median line will represent the previous 30 days worth of data (2019-11-16 to 2019-12-16)
 as a metric to compare against.
 
-### Enabling chart
+### Disabling chart
 
-By default, this chart is disabled for self-managed instances. To enable it, ask an
-administrator with Rails console access to run the following:
+This chart is enabled by default. If you have a self-managed instance, an
+administrator can open a Rails console and disable it with the following command:
 
 ```ruby
-Feature.enable(:cycle_analytics_scatterplot_enabled)
+Feature.disable(:cycle_analytics_scatterplot_enabled)
 ```
 
-This chart is enabled by default on GitLab.com.
+### Disabling chart median line
+
+This chart median line is enabled by default. If you have a self-managed instance, an
+administrator can open a Rails console and disable it with the following command:
+
+```ruby
+Feature.disable(:cycle_analytics_scatterplot_median_enabled)
+```
 
 ## Permissions
 
diff --git a/doc/user/project/merge_requests/img/approvals_premium_mr_widget.png b/doc/user/project/merge_requests/img/approvals_premium_mr_widget.png
deleted file mode 100644
index 2598cc71c33..00000000000
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diff --git a/doc/user/project/merge_requests/img/approvals_premium_mr_widget_v12_7.png b/doc/user/project/merge_requests/img/approvals_premium_mr_widget_v12_7.png
new file mode 100644
index 00000000000..f9348b0eefc
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diff --git a/doc/user/project/merge_requests/img/mr_approvals_by_code_owners_v12_4.png b/doc/user/project/merge_requests/img/mr_approvals_by_code_owners_v12_4.png
deleted file mode 100644
index c704129685f..00000000000
Binary files a/doc/user/project/merge_requests/img/mr_approvals_by_code_owners_v12_4.png and /dev/null differ
diff --git a/doc/user/project/merge_requests/img/mr_approvals_by_code_owners_v12_7.png b/doc/user/project/merge_requests/img/mr_approvals_by_code_owners_v12_7.png
new file mode 100644
index 00000000000..c2e5714e78d
Binary files /dev/null and b/doc/user/project/merge_requests/img/mr_approvals_by_code_owners_v12_7.png differ
diff --git a/doc/user/project/merge_requests/merge_request_approvals.md b/doc/user/project/merge_requests/merge_request_approvals.md
index fa30f4e2eb4..d7bb2dd16f9 100644
--- a/doc/user/project/merge_requests/merge_request_approvals.md
+++ b/doc/user/project/merge_requests/merge_request_approvals.md
@@ -74,9 +74,9 @@ To enable this merge request approval rule:
 
 1. Navigate to your project's **Settings > General** and expand
    **Merge request approvals**.
-1. Locate **All members with Developer role or higher and code owners (if any)** and click **Edit** to choose the number of approvals required.
+1. Locate **Any eligible user** and choose the number of approvals required.
 
-![MR approvals by Code Owners](img/mr_approvals_by_code_owners_v12_4.png)
+![MR approvals by Code Owners](img/mr_approvals_by_code_owners_v12_7.png)
 
 Once set, merge requests can only be merged once approved by the
 number of approvals you've set. GitLab will accept approvals from
@@ -145,7 +145,7 @@ a rule is already defined.
 When an [eligible approver](#eligible-approvers) approves a merge request, it will
 reduce the number of approvals left for all rules that the approver belongs to.
 
-![Approvals premium merge request widget](img/approvals_premium_mr_widget.png)
+![Approvals premium merge request widget](img/approvals_premium_mr_widget_v12_7.png)
 
 ## Adding or removing an approval
 
diff --git a/lib/gitlab/auth/current_user_mode.rb b/lib/gitlab/auth/current_user_mode.rb
index 1ef95c03cfc..cb39baaa6cc 100644
--- a/lib/gitlab/auth/current_user_mode.rb
+++ b/lib/gitlab/auth/current_user_mode.rb
@@ -10,54 +10,12 @@ module Gitlab
     class CurrentUserMode
       NotRequestedError = Class.new(StandardError)
 
-      # RequestStore entries
-      CURRENT_REQUEST_BYPASS_SESSION_ADMIN_ID_RS_KEY = { res: :current_user_mode, data: :bypass_session_admin_id }.freeze
-      CURRENT_REQUEST_ADMIN_MODE_USER_RS_KEY =         { res: :current_user_mode, data: :current_admin }.freeze
-
-      # SessionStore entries
       SESSION_STORE_KEY = :current_user_mode
-      ADMIN_MODE_START_TIME_KEY = :admin_mode
-      ADMIN_MODE_REQUESTED_TIME_KEY = :admin_mode_requested
+      ADMIN_MODE_START_TIME_KEY = 'admin_mode'
+      ADMIN_MODE_REQUESTED_TIME_KEY = 'admin_mode_requested'
       MAX_ADMIN_MODE_TIME = 6.hours
       ADMIN_MODE_REQUESTED_GRACE_PERIOD = 5.minutes
 
-      class << self
-        # Admin mode activation requires storing a flag in the user session. Using this
-        # method when scheduling jobs in Sidekiq will bypass the session check for a
-        # user that was already in admin mode
-        def bypass_session!(admin_id)
-          Gitlab::SafeRequestStore[CURRENT_REQUEST_BYPASS_SESSION_ADMIN_ID_RS_KEY] = admin_id
-
-          Gitlab::AppLogger.debug("Bypassing session in admin mode for: #{admin_id}")
-
-          yield
-        ensure
-          Gitlab::SafeRequestStore.delete(CURRENT_REQUEST_BYPASS_SESSION_ADMIN_ID_RS_KEY)
-        end
-
-        def bypass_session_admin_id
-          Gitlab::SafeRequestStore[CURRENT_REQUEST_BYPASS_SESSION_ADMIN_ID_RS_KEY]
-        end
-
-        # Store in the current request the provided user model (only if in admin mode)
-        # and yield
-        def with_current_admin(admin)
-          return yield unless self.new(admin).admin_mode?
-
-          Gitlab::SafeRequestStore[CURRENT_REQUEST_ADMIN_MODE_USER_RS_KEY] = admin
-
-          Gitlab::AppLogger.debug("Admin mode active for: #{admin.username}")
-
-          yield
-        ensure
-          Gitlab::SafeRequestStore.delete(CURRENT_REQUEST_ADMIN_MODE_USER_RS_KEY)
-        end
-
-        def current_admin
-          Gitlab::SafeRequestStore[CURRENT_REQUEST_ADMIN_MODE_USER_RS_KEY]
-        end
-      end
-
       def initialize(user)
         @user = user
       end
@@ -84,7 +42,7 @@ module Gitlab
 
         raise NotRequestedError unless admin_mode_requested?
 
-        reset_request_store_cache_entries
+        reset_request_store
 
         current_session_data[ADMIN_MODE_REQUESTED_TIME_KEY] = nil
         current_session_data[ADMIN_MODE_START_TIME_KEY] = Time.now
@@ -97,7 +55,7 @@ module Gitlab
       def disable_admin_mode!
         return unless user&.admin?
 
-        reset_request_store_cache_entries
+        reset_request_store
 
         current_session_data[ADMIN_MODE_REQUESTED_TIME_KEY] = nil
         current_session_data[ADMIN_MODE_START_TIME_KEY] = nil
@@ -106,7 +64,7 @@ module Gitlab
       def request_admin_mode!
         return unless user&.admin?
 
-        reset_request_store_cache_entries
+        reset_request_store
 
         current_session_data[ADMIN_MODE_REQUESTED_TIME_KEY] = Time.now
       end
@@ -115,12 +73,10 @@ module Gitlab
 
       attr_reader :user
 
-      # RequestStore entry to cache #admin_mode? result
       def admin_mode_rs_key
         @admin_mode_rs_key ||= { res: :current_user_mode, user: user.id, method: :admin_mode? }
       end
 
-      # RequestStore entry to cache #admin_mode_requested? result
       def admin_mode_requested_rs_key
         @admin_mode_requested_rs_key ||= { res: :current_user_mode, user: user.id, method: :admin_mode_requested? }
       end
@@ -130,7 +86,6 @@ module Gitlab
       end
 
       def any_session_with_admin_mode?
-        return true if bypass_session?
         return true if current_session_data.initiated? && current_session_data[ADMIN_MODE_START_TIME_KEY].to_i > MAX_ADMIN_MODE_TIME.ago.to_i
 
         all_sessions.any? do |session|
@@ -148,11 +103,7 @@ module Gitlab
         current_session_data[ADMIN_MODE_REQUESTED_TIME_KEY].to_i > ADMIN_MODE_REQUESTED_GRACE_PERIOD.ago.to_i
       end
 
-      def bypass_session?
-        user&.id && user.id == self.class.bypass_session_admin_id
-      end
-
-      def reset_request_store_cache_entries
+      def reset_request_store
         Gitlab::SafeRequestStore.delete(admin_mode_rs_key)
         Gitlab::SafeRequestStore.delete(admin_mode_requested_rs_key)
       end
diff --git a/lib/gitlab/diff/highlight_cache.rb b/lib/gitlab/diff/highlight_cache.rb
index 0a8fbb9a673..0cb8020bacb 100644
--- a/lib/gitlab/diff/highlight_cache.rb
+++ b/lib/gitlab/diff/highlight_cache.rb
@@ -93,6 +93,8 @@ module Gitlab
             #
             redis.expire(key, EXPIRATION)
           end
+
+          record_metrics(redis.memory("USAGE", key))
         end
 
         # Subsequent read_file calls would need the latest cache.
@@ -101,6 +103,10 @@ module Gitlab
         clear_memoization(:cacheable_files)
       end
 
+      def record_metrics(memory_usage)
+        self.class.gitlab_redis_diff_caching_memory_usage_bytes.observe({}, memory_usage)
+      end
+
       def file_paths
         strong_memoize(:file_paths) do
           diff_files.collect(&:file_path)
diff --git a/lib/gitlab/sidekiq_middleware.rb b/lib/gitlab/sidekiq_middleware.rb
index 6c27213df49..439d45b7a14 100644
--- a/lib/gitlab/sidekiq_middleware.rb
+++ b/lib/gitlab/sidekiq_middleware.rb
@@ -17,7 +17,6 @@ module Gitlab
         chain.add Gitlab::SidekiqMiddleware::BatchLoader
         chain.add Labkit::Middleware::Sidekiq::Server
         chain.add Gitlab::SidekiqMiddleware::InstrumentationLogger
-        chain.add Gitlab::SidekiqMiddleware::AdminMode::Server
         chain.add Gitlab::SidekiqStatus::ServerMiddleware
         chain.add Gitlab::SidekiqMiddleware::WorkerContext::Server
       end
@@ -32,7 +31,6 @@ module Gitlab
         chain.add Gitlab::SidekiqMiddleware::ClientMetrics
         chain.add Gitlab::SidekiqMiddleware::WorkerContext::Client # needs to be before the Labkit middleware
         chain.add Labkit::Middleware::Sidekiq::Client
-        chain.add Gitlab::SidekiqMiddleware::AdminMode::Client
       end
     end
   end
diff --git a/lib/gitlab/sidekiq_middleware/admin_mode/client.rb b/lib/gitlab/sidekiq_middleware/admin_mode/client.rb
deleted file mode 100644
index e227ee654ee..00000000000
--- a/lib/gitlab/sidekiq_middleware/admin_mode/client.rb
+++ /dev/null
@@ -1,34 +0,0 @@
-# frozen_string_literal: true
-
-module Gitlab
-  module SidekiqMiddleware
-    module AdminMode
-      # Checks if admin mode is enabled for the request creating the sidekiq job
-      # by examining if admin mode has been enabled for the user
-      # If enabled then it injects a job field that persists through the job execution
-      class Client
-        def call(_worker_class, job, _queue, _redis_pool)
-          return yield unless Feature.enabled?(:user_mode_in_session)
-
-          # Admin mode enabled in the original request or in a nested sidekiq job
-          admin_mode_user_id = find_admin_user_id
-
-          if admin_mode_user_id
-            job['admin_mode_user_id'] ||= admin_mode_user_id
-
-            Gitlab::AppLogger.debug("AdminMode::Client injected admin mode for job: #{job.inspect}")
-          end
-
-          yield
-        end
-
-        private
-
-        def find_admin_user_id
-          Gitlab::Auth::CurrentUserMode.current_admin&.id ||
-            Gitlab::Auth::CurrentUserMode.bypass_session_admin_id
-        end
-      end
-    end
-  end
-end
diff --git a/lib/gitlab/sidekiq_middleware/admin_mode/server.rb b/lib/gitlab/sidekiq_middleware/admin_mode/server.rb
deleted file mode 100644
index 6366867a0fa..00000000000
--- a/lib/gitlab/sidekiq_middleware/admin_mode/server.rb
+++ /dev/null
@@ -1,24 +0,0 @@
-# frozen_string_literal: true
-
-module Gitlab
-  module SidekiqMiddleware
-    module AdminMode
-      class Server
-        def call(_worker, job, _queue)
-          return yield unless Feature.enabled?(:user_mode_in_session)
-
-          admin_mode_user_id = job['admin_mode_user_id']
-
-          # Do not bypass session if this job was not enabled with admin mode on
-          return yield unless admin_mode_user_id
-
-          Gitlab::Auth::CurrentUserMode.bypass_session!(admin_mode_user_id) do
-            Gitlab::AppLogger.debug("AdminMode::Server bypasses session for admin mode in job: #{job.inspect}")
-
-            yield
-          end
-        end
-      end
-    end
-  end
-end
diff --git a/locale/gitlab.pot b/locale/gitlab.pot
index 67362b2efcc..7bf7cc9051f 100644
--- a/locale/gitlab.pot
+++ b/locale/gitlab.pot
@@ -7137,6 +7137,21 @@ msgstr ""
 msgid "Enable/disable your service desk. %{link_start}Learn more about service desk%{link_end}."
 msgstr ""
 
+msgid "EnableReviewApp|%{stepStart}Step 1%{stepEnd}. Ensure you have Kubernetes set up and have a base domain for your %{linkStart}cluster%{linkEnd}."
+msgstr ""
+
+msgid "EnableReviewApp|%{stepStart}Step 2%{stepEnd}. Copy the following snippet:"
+msgstr ""
+
+msgid "EnableReviewApp|%{stepStart}Step 3%{stepEnd}. Add it to the project %{linkStart}gitlab-ci.yml%{linkEnd} file."
+msgstr ""
+
+msgid "EnableReviewApp|Close"
+msgstr ""
+
+msgid "EnableReviewApp|Copy snippet text"
+msgstr ""
+
 msgid "Enabled"
 msgstr ""
 
@@ -7311,6 +7326,9 @@ msgstr ""
 msgid "Environments|Deployment"
 msgstr ""
 
+msgid "Environments|Enable review app"
+msgstr ""
+
 msgid "Environments|Environment"
 msgstr ""
 
@@ -11529,6 +11547,9 @@ msgstr ""
 msgid "Manage two-factor authentication"
 msgstr ""
 
+msgid "Manage your license"
+msgstr ""
+
 msgid "Manifest"
 msgstr ""
 
@@ -16189,6 +16210,9 @@ msgstr ""
 msgid "Review time is defined as the time it takes from first comment until merged."
 msgstr ""
 
+msgid "ReviewApp|Enable Review App"
+msgstr ""
+
 msgid "Reviewing"
 msgstr ""
 
@@ -19205,6 +19229,9 @@ msgstr ""
 msgid "This GitLab instance does not provide any shared Runners yet. Instance administrators can register shared Runners in the admin area."
 msgstr ""
 
+msgid "This GitLab instance is licensed at the %{insufficient_license} tier. Geo is only available for users who have at least a Premium license."
+msgstr ""
+
 msgid "This action can lead to data loss. To prevent accidental actions we ask you to confirm your intention."
 msgstr ""
 
@@ -21868,9 +21895,6 @@ msgstr ""
 msgid "You need a different license to enable FileLocks feature"
 msgstr ""
 
-msgid "You need a different license to use Geo replication."
-msgstr ""
-
 msgid "You need git-lfs version %{min_git_lfs_version} (or greater) to continue. Please visit https://git-lfs.github.com"
 msgstr ""
 
diff --git a/qa/qa/page/project/pipeline/show.rb b/qa/qa/page/project/pipeline/show.rb
index 45fffbf6000..1003b828a32 100644
--- a/qa/qa/page/project/pipeline/show.rb
+++ b/qa/qa/page/project/pipeline/show.rb
@@ -30,9 +30,9 @@ module QA::Page
         element :pipeline_badges
       end
 
-      def running?
+      def running?(wait: 0)
         within('.ci-header-container') do
-          page.has_content?('running')
+          page.has_content?('running', wait: wait)
         end
       end
 
diff --git a/qa/qa/specs/features/browser_ui/4_verify/pipeline/create_and_process_pipeline_spec.rb b/qa/qa/specs/features/browser_ui/4_verify/pipeline/create_and_process_pipeline_spec.rb
index d4853a7bcf3..3e000c6381e 100644
--- a/qa/qa/specs/features/browser_ui/4_verify/pipeline/create_and_process_pipeline_spec.rb
+++ b/qa/qa/specs/features/browser_ui/4_verify/pipeline/create_and_process_pipeline_spec.rb
@@ -1,78 +1,74 @@
 # frozen_string_literal: true
 
 module QA
-  context 'Verify', :orchestrated, :docker do
+  context 'Verify', :docker do
     describe 'Pipeline creation and processing' do
       let(:executor) { "qa-runner-#{Time.now.to_i}" }
 
+      let(:project) do
+        Resource::Project.fabricate_via_api! do |project|
+          project.name = 'project-with-pipeline'
+        end
+      end
+
+      before do
+        Resource::Runner.fabricate! do |runner|
+          runner.project = project
+          runner.name = executor
+          runner.tags = [executor]
+        end
+      end
+
       after do
         Service::DockerRun::GitlabRunner.new(executor).remove!
       end
 
-      it 'users creates a pipeline which gets processed' do
+      it 'users creates a pipeline which gets processed', :smoke do
         Flow::Login.sign_in
 
-        project = Resource::Project.fabricate! do |project|
-          project.name = 'project-with-pipelines'
-          project.description = 'Project with CI/CD Pipelines.'
-        end
+        Resource::Repository::Commit.fabricate_via_api! do |commit|
+          commit.project = project
+          commit.commit_message = 'Add .gitlab-ci.yml'
+          commit.add_files(
+            [
+              {
+                file_path: '.gitlab-ci.yml',
+                content: <<~YAML
+                  test-success:
+                    tags:
+                      - #{executor}
+                    script: echo 'OK'
 
-        Resource::Runner.fabricate! do |runner|
-          runner.project = project
-          runner.name = executor
-          runner.tags = %w[qa test]
-        end
+                  test-failure:
+                    tags:
+                      - #{executor}
+                    script:
+                      - echo 'FAILURE'
+                      - exit 1
 
-        Resource::Repository::ProjectPush.fabricate! do |push|
-          push.project = project
-          push.file_name = '.gitlab-ci.yml'
-          push.commit_message = 'Add .gitlab-ci.yml'
-          push.file_content = <<~EOF
-            test-success:
-              tags:
-                - qa
-                - test
-              script: echo 'OK'
+                  test-tags:
+                    tags:
+                     - invalid
+                    script: echo 'NOOP'
 
-            test-failure:
-              tags:
-                - qa
-                - test
-              script:
-                - echo 'FAILURE'
-                - exit 1
-
-            test-tags:
-              tags:
-                - qa
-                - docker
-              script: echo 'NOOP'
-
-            test-artifacts:
-              tags:
-                - qa
-                - test
-              script: mkdir my-artifacts; echo "CONTENTS" > my-artifacts/artifact.txt
-              artifacts:
-                paths:
-                - my-artifacts/
-          EOF
+                  test-artifacts:
+                    tags:
+                      - #{executor}
+                    script: mkdir my-artifacts; echo "CONTENTS" > my-artifacts/artifact.txt
+                    artifacts:
+                      paths:
+                      - my-artifacts/
+                YAML
+              }
+            ]
+          )
         end.project.visit!
 
-        expect(page).to have_content('Add .gitlab-ci.yml')
-
         Page::Project::Menu.perform(&:click_ci_cd_pipelines)
-
-        expect(page).to have_content('All 1')
-        expect(page).to have_content('Add .gitlab-ci.yml')
-
-        puts 'Waiting for the runner to process the pipeline'
-        sleep 15 # Runner should process all jobs within 15 seconds.
-
         Page::Project::Pipeline::Index.perform(&:click_on_latest_pipeline)
 
         Page::Project::Pipeline::Show.perform do |pipeline|
-          expect(pipeline).to be_running
+          expect(pipeline).to be_running(wait: 30)
           expect(pipeline).to have_build('test-success', status: :success)
           expect(pipeline).to have_build('test-failure', status: :failed)
           expect(pipeline).to have_build('test-tags', status: :pending)
diff --git a/spec/features/admin/admin_mode/workers_spec.rb b/spec/features/admin/admin_mode/workers_spec.rb
deleted file mode 100644
index e33c9d7e64c..00000000000
--- a/spec/features/admin/admin_mode/workers_spec.rb
+++ /dev/null
@@ -1,77 +0,0 @@
-# frozen_string_literal: true
-
-require 'spec_helper'
-
-# Test an operation that triggers background jobs requiring administrative rights
-describe 'Admin mode for workers', :do_not_mock_admin_mode, :request_store, :clean_gitlab_redis_shared_state do
-  let(:user) { create(:user) }
-  let(:user_to_delete) { create(:user) }
-
-  before do
-    add_sidekiq_middleware
-
-    sign_in(user)
-  end
-
-  context 'as a regular user' do
-    it 'cannot delete user' do
-      visit admin_user_path(user_to_delete)
-
-      expect(page).to have_gitlab_http_status(:not_found)
-    end
-  end
-
-  context 'as an admin user' do
-    let(:user) { create(:admin) }
-
-    context 'when admin mode disabled' do
-      it 'cannot delete user', :js do
-        visit admin_user_path(user_to_delete)
-
-        expect(page).to have_content('Re-authentication required')
-      end
-    end
-
-    context 'when admin mode enabled', :delete do
-      before do
-        gitlab_enable_admin_mode_sign_in(user)
-      end
-
-      it 'can delete user', :js do
-        visit admin_user_path(user_to_delete)
-        click_button 'Delete user'
-
-        page.within '.modal-dialog' do
-          find("input[name='username']").send_keys(user_to_delete.name)
-          click_button 'Delete user'
-
-          wait_for_requests
-        end
-
-        expect(page).to have_content('The user is being deleted.')
-
-        # Perform jobs while logged out so that admin mode is only enabled in job metadata
-        execute_jobs_signed_out(user)
-
-        visit admin_user_path(user_to_delete)
-
-        expect(page).to have_title('Not Found')
-      end
-    end
-  end
-
-  def add_sidekiq_middleware
-    Sidekiq::Testing.server_middleware do |chain|
-      chain.add Gitlab::SidekiqMiddleware::AdminMode::Server
-    end
-  end
-
-  def execute_jobs_signed_out(user)
-    gitlab_sign_out
-
-    Sidekiq::Worker.drain_all
-
-    sign_in(user)
-    gitlab_enable_admin_mode_sign_in(user)
-  end
-end
diff --git a/spec/features/admin/admin_uses_repository_checks_spec.rb b/spec/features/admin/admin_uses_repository_checks_spec.rb
index 954773e766d..3e8197588ed 100644
--- a/spec/features/admin/admin_uses_repository_checks_spec.rb
+++ b/spec/features/admin/admin_uses_repository_checks_spec.rb
@@ -2,64 +2,46 @@
 
 require 'spec_helper'
 
-describe 'Admin uses repository checks', :request_store, :clean_gitlab_redis_shared_state, :do_not_mock_admin_mode do
+describe 'Admin uses repository checks' do
   include StubENV
 
-  let(:admin) { create(:admin) }
-
   before do
     stub_env('IN_MEMORY_APPLICATION_SETTINGS', 'false')
-    sign_in(admin)
+    sign_in(create(:admin))
   end
 
-  context 'when admin mode is disabled' do
-    it 'admin project page requires admin mode' do
-      project = create(:project)
-      visit_admin_project_page(project)
+  it 'to trigger a single check' do
+    project = create(:project)
+    visit_admin_project_page(project)
 
-      expect(page).not_to have_css('.repository-check')
-      expect(page).to have_content('Enter Admin Mode')
+    page.within('.repository-check') do
+      click_button 'Trigger repository check'
+    end
+
+    expect(page).to have_content('Repository check was triggered')
+  end
+
+  it 'to see a single failed repository check', :js do
+    project = create(:project)
+    project.update_columns(
+      last_repository_check_failed: true,
+      last_repository_check_at: Time.now
+    )
+    visit_admin_project_page(project)
+
+    page.within('.alert') do
+      expect(page.text).to match(/Last repository check \(just now\) failed/)
     end
   end
 
-  context 'when admin mode is enabled' do
-    before do
-      gitlab_enable_admin_mode_sign_in(admin)
-    end
+  it 'to clear all repository checks', :js do
+    visit repository_admin_application_settings_path
 
-    it 'to trigger a single check', :js do
-      project = create(:project)
-      visit_admin_project_page(project)
+    expect(RepositoryCheck::ClearWorker).to receive(:perform_async)
 
-      page.within('.repository-check') do
-        click_button 'Trigger repository check'
-      end
+    accept_confirm { find(:link, 'Clear all repository checks').send_keys(:return) }
 
-      expect(page).to have_content('Repository check was triggered')
-    end
-
-    it 'to see a single failed repository check', :js do
-      project = create(:project)
-      project.update_columns(
-        last_repository_check_failed: true,
-        last_repository_check_at: Time.now
-      )
-      visit_admin_project_page(project)
-
-      page.within('.alert') do
-        expect(page.text).to match(/Last repository check \(just now\) failed/)
-      end
-    end
-
-    it 'to clear all repository checks', :js do
-      visit repository_admin_application_settings_path
-
-      expect(RepositoryCheck::ClearWorker).to receive(:perform_async)
-
-      accept_confirm { find(:link, 'Clear all repository checks').send_keys(:return) }
-
-      expect(page).to have_content('Started asynchronous removal of all repository check states.')
-    end
+    expect(page).to have_content('Started asynchronous removal of all repository check states.')
   end
 
   def visit_admin_project_page(project)
diff --git a/spec/frontend/environments/enable_review_app_button_spec.js b/spec/frontend/environments/enable_review_app_button_spec.js
new file mode 100644
index 00000000000..5549a1737fc
--- /dev/null
+++ b/spec/frontend/environments/enable_review_app_button_spec.js
@@ -0,0 +1,31 @@
+import { shallowMount, mount } from '@vue/test-utils';
+import ModalCopyButton from '~/vue_shared/components/modal_copy_button.vue';
+import EnableReviewAppButton from '~/environments/components/enable_review_app_button.vue';
+
+describe('Enable Review App Button', () => {
+  let wrapper;
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  describe('renders button with text', () => {
+    beforeEach(() => {
+      wrapper = mount(EnableReviewAppButton);
+    });
+
+    it('renders Enable Review text', () => {
+      expect(wrapper.text()).toBe('Enable review app');
+    });
+  });
+
+  describe('renders the modal', () => {
+    beforeEach(() => {
+      wrapper = shallowMount(EnableReviewAppButton);
+    });
+
+    it('renders the copyToClipboard button', () => {
+      expect(wrapper.find(ModalCopyButton).exists()).toBe(true);
+    });
+  });
+});
diff --git a/spec/javascripts/environments/environments_app_spec.js b/spec/javascripts/environments/environments_app_spec.js
index 75526c2ba74..6c05b609923 100644
--- a/spec/javascripts/environments/environments_app_spec.js
+++ b/spec/javascripts/environments/environments_app_spec.js
@@ -55,6 +55,26 @@ describe('Environment', () => {
           "You don't have any environments right now",
         );
       });
+
+      describe('when it is possible to enable a review app', () => {
+        beforeEach(done => {
+          mock
+            .onGet(mockData.endpoint)
+            .reply(200, { environments: [], review_app: { can_setup_review_app: true } });
+
+          component = mountComponent(EnvironmentsComponent, mockData);
+
+          setTimeout(() => {
+            done();
+          }, 0);
+        });
+
+        it('should render the enable review app button', () => {
+          expect(component.$el.querySelector('.js-enable-review-app-button').textContent).toContain(
+            'Enable review app',
+          );
+        });
+      });
     });
 
     describe('with paginated environments', () => {
diff --git a/spec/lib/gitlab/auth/current_user_mode_spec.rb b/spec/lib/gitlab/auth/current_user_mode_spec.rb
index 7c2fdac6c25..3b3db0f7315 100644
--- a/spec/lib/gitlab/auth/current_user_mode_spec.rb
+++ b/spec/lib/gitlab/auth/current_user_mode_spec.rb
@@ -2,10 +2,10 @@
 
 require 'spec_helper'
 
-describe Gitlab::Auth::CurrentUserMode, :do_not_mock_admin_mode, :request_store do
+describe Gitlab::Auth::CurrentUserMode, :do_not_mock_admin_mode do
   include_context 'custom session'
 
-  let(:user) { build_stubbed(:user) }
+  let(:user) { build(:user) }
 
   subject { described_class.new(user) }
 
@@ -13,66 +13,54 @@ describe Gitlab::Auth::CurrentUserMode, :do_not_mock_admin_mode, :request_store
     allow(ActiveSession).to receive(:list_sessions).with(user).and_return([session])
   end
 
-  shared_examples 'admin mode cannot be enabled' do
-    it 'is false by default' do
-      expect(subject.admin_mode?).to be(false)
-    end
+  describe '#admin_mode?', :request_store do
+    context 'when the user is a regular user' do
+      it 'is false by default' do
+        expect(subject.admin_mode?).to be(false)
+      end
 
-    it 'cannot be enabled with a valid password' do
-      subject.enable_admin_mode!(password: user.password)
-
-      expect(subject.admin_mode?).to be(false)
-    end
-
-    it 'cannot be enabled with an invalid password' do
-      subject.enable_admin_mode!(password: nil)
-
-      expect(subject.admin_mode?).to be(false)
-    end
-
-    it 'cannot be enabled with empty params' do
-      subject.enable_admin_mode!
-
-      expect(subject.admin_mode?).to be(false)
-    end
-
-    it 'disable has no effect' do
-      subject.enable_admin_mode!
-      subject.disable_admin_mode!
-
-      expect(subject.admin_mode?).to be(false)
-    end
-
-    context 'skipping password validation' do
       it 'cannot be enabled with a valid password' do
-        subject.enable_admin_mode!(password: user.password, skip_password_validation: true)
+        subject.enable_admin_mode!(password: user.password)
 
         expect(subject.admin_mode?).to be(false)
       end
 
       it 'cannot be enabled with an invalid password' do
-        subject.enable_admin_mode!(skip_password_validation: true)
+        subject.enable_admin_mode!(password: nil)
 
         expect(subject.admin_mode?).to be(false)
       end
-    end
-  end
 
-  describe '#admin_mode?' do
-    context 'when the user is a regular user' do
-      it_behaves_like 'admin mode cannot be enabled'
+      it 'cannot be enabled with empty params' do
+        subject.enable_admin_mode!
 
-      context 'bypassing session' do
-        it_behaves_like 'admin mode cannot be enabled' do
-          around do |example|
-            described_class.bypass_session!(user.id) { example.run }
-          end
+        expect(subject.admin_mode?).to be(false)
+      end
+
+      it 'disable has no effect' do
+        subject.enable_admin_mode!
+        subject.disable_admin_mode!
+
+        expect(subject.admin_mode?).to be(false)
+      end
+
+      context 'skipping password validation' do
+        it 'cannot be enabled with a valid password' do
+          subject.enable_admin_mode!(password: user.password, skip_password_validation: true)
+
+          expect(subject.admin_mode?).to be(false)
+        end
+
+        it 'cannot be enabled with an invalid password' do
+          subject.enable_admin_mode!(skip_password_validation: true)
+
+          expect(subject.admin_mode?).to be(false)
         end
       end
     end
 
     context 'when the user is an admin' do
-      let(:user) { build_stubbed(:user, :admin) }
+      let(:user) { build(:user, :admin) }
 
       context 'when admin mode not requested' do
         it 'is false by default' do
@@ -160,36 +148,11 @@ describe Gitlab::Auth::CurrentUserMode, :do_not_mock_admin_mode, :request_store
           end
         end
       end
-
-      context 'bypassing session' do
-        it 'is active by default' do
-          described_class.bypass_session!(user.id) do
-            expect(subject.admin_mode?).to be(true)
-          end
-        end
-
-        it 'enable has no effect' do
-          described_class.bypass_session!(user.id) do
-            subject.request_admin_mode!
-            subject.enable_admin_mode!(password: user.password)
-
-            expect(subject.admin_mode?).to be(true)
-          end
-        end
-
-        it 'disable has no effect' do
-          described_class.bypass_session!(user.id) do
-            subject.disable_admin_mode!
-
-            expect(subject.admin_mode?).to be(true)
-          end
-        end
-      end
     end
   end
 
   describe '#enable_admin_mode!' do
-    let(:user) { build_stubbed(:user, :admin) }
+    let(:user) { build(:user, :admin) }
 
     it 'creates a timestamp in the session' do
       subject.request_admin_mode!
@@ -200,7 +163,7 @@ describe Gitlab::Auth::CurrentUserMode, :do_not_mock_admin_mode, :request_store
   end
 
   describe '#enable_sessionless_admin_mode!' do
-    let(:user) { build_stubbed(:user, :admin) }
+    let(:user) { build(:user, :admin) }
 
     it 'enabled admin mode without password' do
       subject.enable_sessionless_admin_mode!
@@ -210,7 +173,7 @@ describe Gitlab::Auth::CurrentUserMode, :do_not_mock_admin_mode, :request_store
   end
 
   describe '#disable_admin_mode!' do
-    let(:user) { build_stubbed(:user, :admin) }
+    let(:user) { build(:user, :admin) }
 
     it 'sets the session timestamp to nil' do
       subject.request_admin_mode!
@@ -220,73 +183,6 @@ describe Gitlab::Auth::CurrentUserMode, :do_not_mock_admin_mode, :request_store
     end
   end
 
-  describe '.bypass_session!' do
-    context 'with a regular user' do
-      it 'admin mode is false' do
-        described_class.bypass_session!(user.id) do
-          expect(subject.admin_mode?).to be(false)
-          expect(described_class.bypass_session_admin_id).to be(user.id)
-        end
-
-        expect(described_class.bypass_session_admin_id).to be_nil
-      end
-    end
-
-    context 'with an admin user' do
-      let(:user) { build_stubbed(:user, :admin) }
-
-      it 'admin mode is true' do
-        described_class.bypass_session!(user.id) do
-          expect(subject.admin_mode?).to be(true)
-          expect(described_class.bypass_session_admin_id).to be(user.id)
-        end
-
-        expect(described_class.bypass_session_admin_id).to be_nil
-      end
-    end
-  end
-
-  describe '.with_current_request_admin_mode' do
-    context 'with a regular user' do
-      it 'user is not available inside nor outside the yielded block' do
-        described_class.with_current_admin(user) do
-          expect(described_class.current_admin).to be_nil
-        end
-
-        expect(described_class.bypass_session_admin_id).to be_nil
-      end
-    end
-
-    context 'with an admin user' do
-      let(:user) { build_stubbed(:user, :admin) }
-
-      context 'admin mode is disabled' do
-        it 'user is not available inside nor outside the yielded block' do
-          described_class.with_current_admin(user) do
-            expect(described_class.current_admin).to be_nil
-          end
-
-          expect(described_class.bypass_session_admin_id).to be_nil
-        end
-      end
-
-      context 'admin mode is enabled' do
-        before do
-          subject.request_admin_mode!
-          subject.enable_admin_mode!(password: user.password)
-        end
-
-        it 'user is available only inside the yielded block' do
-          described_class.with_current_admin(user) do
-            expect(described_class.current_admin).to be(user)
-          end
-
-          expect(described_class.current_admin).to be_nil
-        end
-      end
-    end
-  end
-
   def expected_session_entry(value_matcher)
     {
       Gitlab::Auth::CurrentUserMode::SESSION_STORE_KEY => a_hash_including(
diff --git a/spec/lib/gitlab/diff/highlight_cache_spec.rb b/spec/lib/gitlab/diff/highlight_cache_spec.rb
index 218c393c409..c1ec97ae88c 100644
--- a/spec/lib/gitlab/diff/highlight_cache_spec.rb
+++ b/spec/lib/gitlab/diff/highlight_cache_spec.rb
@@ -101,6 +101,13 @@ describe Gitlab::Diff::HighlightCache, :clean_gitlab_redis_cache do
       let(:paths) { merge_request.diffs.raw_diff_files.select(&:text?).map(&:file_path) }
     end
 
+    it 'updates memory usage metrics' do
+      expect(described_class.gitlab_redis_diff_caching_memory_usage_bytes)
+        .to receive(:observe).and_call_original
+
+      cache.send(:write_to_redis_hash, diff_hash)
+    end
+
     context 'different diff_collections for the same diffable' do
       before do
         cache.write_if_empty
diff --git a/spec/lib/gitlab/sidekiq_middleware/admin_mode/client_spec.rb b/spec/lib/gitlab/sidekiq_middleware/admin_mode/client_spec.rb
deleted file mode 100644
index f6449bae8c3..00000000000
--- a/spec/lib/gitlab/sidekiq_middleware/admin_mode/client_spec.rb
+++ /dev/null
@@ -1,94 +0,0 @@
-# frozen_string_literal: true
-
-require 'spec_helper'
-
-describe Gitlab::SidekiqMiddleware::AdminMode::Client, :do_not_mock_admin_mode, :request_store do
-  include AdminModeHelper
-
-  let(:worker) do
-    Class.new do
-      def perform; end
-    end
-  end
-
-  let(:job) { {} }
-  let(:queue) { :test }
-
-  it 'yields block' do
-    expect do |b|
-      subject.call(worker, job, queue, nil, &b)
-    end.to yield_control.once
-  end
-
-  context 'user is a regular user' do
-    it 'no admin mode field in payload' do
-      subject.call(worker, job, queue, nil) { nil }
-
-      expect(job).not_to include('admin_mode_user_id')
-    end
-  end
-
-  context 'user is an administrator' do
-    let(:admin) { create(:admin) }
-
-    context 'admin mode disabled' do
-      it 'no admin mode field in payload' do
-        subject.call(worker, job, queue, nil) { nil }
-
-        expect(job).not_to include('admin_mode_user_id')
-      end
-    end
-
-    context 'admin mode enabled' do
-      before do
-        enable_admin_mode!(admin)
-      end
-
-      context 'when sidekiq required context not set' do
-        it 'no admin mode field in payload' do
-          subject.call(worker, job, queue, nil) { nil }
-
-          expect(job).not_to include('admin_mode_user_id')
-        end
-      end
-
-      context 'when user stored in current request' do
-        it 'has admin mode field in payload' do
-          Gitlab::Auth::CurrentUserMode.with_current_admin(admin) do
-            subject.call(worker, job, queue, nil) { nil }
-
-            expect(job).to include('admin_mode_user_id' => admin.id)
-          end
-        end
-      end
-
-      context 'when bypassing session' do
-        it 'has admin mode field in payload' do
-          Gitlab::Auth::CurrentUserMode.bypass_session!(admin.id) do
-            subject.call(worker, job, queue, nil) { nil }
-
-            expect(job).to include('admin_mode_user_id' => admin.id)
-          end
-        end
-      end
-    end
-  end
-
-  context 'admin mode feature disabled' do
-    before do
-      stub_feature_flags(user_mode_in_session: false)
-    end
-
-    it 'yields block' do
-      expect do |b|
-        subject.call(worker, job, queue, nil, &b)
-      end.to yield_control.once
-    end
-
-    it 'no admin mode field in payload' do
-      subject.call(worker, job, queue, nil) { nil }
-
-      expect(job).not_to include('admin_mode_user_id')
-    end
-  end
-end
diff --git a/spec/lib/gitlab/sidekiq_middleware/admin_mode/server_spec.rb b/spec/lib/gitlab/sidekiq_middleware/admin_mode/server_spec.rb
deleted file mode 100644
index 60475f0e403..00000000000
--- a/spec/lib/gitlab/sidekiq_middleware/admin_mode/server_spec.rb
+++ /dev/null
@@ -1,72 +0,0 @@
-# frozen_string_literal: true
-
-require 'spec_helper'
-
-describe Gitlab::SidekiqMiddleware::AdminMode::Server, :do_not_mock_admin_mode, :request_store do
-  include AdminModeHelper
-
-  let(:worker) do
-    Class.new do
-      def perform; end
-    end
-  end
-
-  let(:job) { {} }
-  let(:queue) { :test }
-
-  it 'yields block' do
-    expect do |b|
-      subject.call(worker, job, queue, &b)
-    end.to yield_control.once
-  end
-
-  context 'job has no admin mode field' do
-    it 'session is not bypassed' do
-      subject.call(worker, job, queue) do
-        expect(Gitlab::Auth::CurrentUserMode.bypass_session_admin_id).to be_nil
-      end
-    end
-  end
-
-  context 'job has admin mode field' do
-    let(:admin) { create(:admin) }
-
-    context 'nil admin mode id' do
-      let(:job) { { 'admin_mode_user_id' => nil } }
-
-      it 'session is not bypassed' do
-        subject.call(worker, job, queue) do
-          expect(Gitlab::Auth::CurrentUserMode.bypass_session_admin_id).to be_nil
-        end
-      end
-    end
-
-    context 'valid admin mode id' do
-      let(:job) { { 'admin_mode_user_id' => admin.id } }
-
-      it 'session is bypassed' do
-        subject.call(worker, job, queue) do
-          expect(Gitlab::Auth::CurrentUserMode.bypass_session_admin_id).to be(admin.id)
-        end
-      end
-    end
-  end
-
-  context 'admin mode feature disabled' do
-    before do
-      stub_feature_flags(user_mode_in_session: false)
-    end
-
-    it 'yields block' do
-      expect do |b|
-        subject.call(worker, job, queue, &b)
-      end.to yield_control.once
-    end
-
-    it 'session is not bypassed' do
-      subject.call(worker, job, queue) do
-        expect(Gitlab::Auth::CurrentUserMode.bypass_session_admin_id).to be_nil
-      end
-    end
-  end
-end
diff --git a/spec/lib/gitlab/sidekiq_middleware_spec.rb b/spec/lib/gitlab/sidekiq_middleware_spec.rb
index 19242d25e27..e8dcbbd2ee1 100644
--- a/spec/lib/gitlab/sidekiq_middleware_spec.rb
+++ b/spec/lib/gitlab/sidekiq_middleware_spec.rb
@@ -45,8 +45,7 @@ describe Gitlab::SidekiqMiddleware do
        Gitlab::SidekiqMiddleware::ArgumentsLogger,
        Gitlab::SidekiqMiddleware::MemoryKiller,
        Gitlab::SidekiqMiddleware::RequestStoreMiddleware,
-       Gitlab::SidekiqMiddleware::WorkerContext::Server,
-       Gitlab::SidekiqMiddleware::AdminMode::Server
+       Gitlab::SidekiqMiddleware::WorkerContext::Server
       ]
     end
     let(:enabled_sidekiq_middlewares) { all_sidekiq_middlewares - disabled_sidekiq_middlewares }
@@ -116,8 +115,7 @@ describe Gitlab::SidekiqMiddleware do
         Gitlab::SidekiqStatus::ClientMiddleware,
         Gitlab::SidekiqMiddleware::ClientMetrics,
         Gitlab::SidekiqMiddleware::WorkerContext::Client,
-        Labkit::Middleware::Sidekiq::Client,
-        Gitlab::SidekiqMiddleware::AdminMode::Client
+        Labkit::Middleware::Sidekiq::Client
       ]
     end
 
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index 610b3e47c11..d14de7e99de 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -2985,9 +2985,9 @@ describe User, :do_not_mock_admin_mode do
     end
   end
 
-  describe '#can_read_all_resources?', :request_store do
+  describe '#can_read_all_resources?' do
     it 'returns false for regular user' do
-      user = build_stubbed(:user)
+      user = build(:user)
 
       expect(user.can_read_all_resources?).to be_falsy
     end
@@ -2995,7 +2995,7 @@ describe User, :do_not_mock_admin_mode do
     context 'for admin user' do
       include_context 'custom session'
 
-      let(:user) { build_stubbed(:user, :admin) }
+      let(:user) { build(:user, :admin) }
 
       context 'when admin mode is disabled' do
         it 'returns false' do
diff --git a/spec/policies/base_policy_spec.rb b/spec/policies/base_policy_spec.rb
index ae5af9e0f29..81aee4cfcac 100644
--- a/spec/policies/base_policy_spec.rb
+++ b/spec/policies/base_policy_spec.rb
@@ -23,8 +23,8 @@ describe BasePolicy, :do_not_mock_admin_mode do
   end
 
   describe 'read cross project' do
-    let(:current_user) { build_stubbed(:user) }
-    let(:user) { build_stubbed(:user) }
+    let(:current_user) { create(:user) }
+    let(:user) { create(:user) }
 
     subject { described_class.new(current_user, [user]) }
 
@@ -38,7 +38,7 @@ describe BasePolicy, :do_not_mock_admin_mode do
       it { is_expected.not_to be_allowed(:read_cross_project) }
 
       context 'for admins' do
-        let(:current_user) { build_stubbed(:admin) }
+        let(:current_user) { build(:admin) }
 
         subject { described_class.new(current_user, nil) }
 
@@ -56,14 +56,14 @@ describe BasePolicy, :do_not_mock_admin_mode do
   end
 
   describe 'full private access' do
-    let(:current_user) { build_stubbed(:user) }
+    let(:current_user) { create(:user) }
 
     subject { described_class.new(current_user, nil) }
 
     it { is_expected.not_to be_allowed(:read_all_resources) }
 
     context 'for admins' do
-      let(:current_user) { build_stubbed(:admin) }
+      let(:current_user) { build(:admin) }
 
       it 'allowed when in admin mode' do
         enable_admin_mode!(current_user)
diff --git a/spec/support/shared_examples/features/discussion_comments_shared_example.rb b/spec/support/shared_examples/features/discussion_comments_shared_example.rb
index 257b53b2a7b..81433d124c9 100644
--- a/spec/support/shared_examples/features/discussion_comments_shared_example.rb
+++ b/spec/support/shared_examples/features/discussion_comments_shared_example.rb
@@ -8,44 +8,40 @@ RSpec.shared_examples 'thread comments' do |resource_name|
   let(:submit_selector) { "#{form_selector} .js-comment-submit-button" }
   let(:close_selector) { "#{form_selector} .btn-comment-and-close" }
   let(:comments_selector) { '.timeline > .note.timeline-entry' }
+  let(:comment) { 'My comment' }
 
-  it 'clicking "Comment" will post a comment', :quarantine do
+  it 'clicking "Comment" will post a comment' do
     expect(page).to have_selector toggle_selector
 
-    find("#{form_selector} .note-textarea").send_keys('a')
+    find("#{form_selector} .note-textarea").send_keys(comment)
 
-    find(submit_selector).click
+    click_button 'Comment'
 
-    wait_for_requests
+    expect(page).to have_content(comment)
 
-    find(comments_selector, match: :first)
     new_comment = all(comments_selector).last
 
-    expect(new_comment).to have_content 'a'
     expect(new_comment).not_to have_selector '.discussion'
   end
 
   if resource_name == 'issue'
     it "clicking 'Comment & close #{resource_name}' will post a comment and close the #{resource_name}" do
-      find("#{form_selector} .note-textarea").send_keys('a')
+      find("#{form_selector} .note-textarea").send_keys(comment)
 
-      find(close_selector).click
-      wait_for_requests
+      click_button 'Comment & close issue'
 
-      find(comments_selector, match: :first)
-      find("#{comments_selector}.system-note")
-      entries = all(comments_selector)
-      close_note = entries.last
-      new_comment = entries[-2]
+      expect(page).to have_content(comment)
+      expect(page).to have_content "@#{user.username} closed"
+
+      new_comment = all(comments_selector).last
 
-      expect(close_note).to have_content 'closed'
       expect(new_comment).not_to have_selector '.discussion'
     end
   end
 
   describe 'when the toggle is clicked' do
     before do
-      find("#{form_selector} .note-textarea").send_keys('a')
+      find("#{form_selector} .note-textarea").send_keys(comment)
 
       find(toggle_selector).click
     end
@@ -153,10 +149,11 @@ RSpec.shared_examples 'thread comments' do |resource_name|
         end
 
         it 'clicking "Start thread" will post a thread' do
+          expect(page).to have_content(comment)
+
           new_comment = all(comments_selector).last
 
-          expect(new_comment).to have_content 'a'
-          expect(new_comment).to have_selector '.discussion'
+          expect(new_comment).to have_selector('.discussion')
         end
 
         if resource_name =~ /(issue|merge request)/
@@ -208,15 +205,13 @@ RSpec.shared_examples 'thread comments' do |resource_name|
 
       if resource_name == 'issue'
         it "clicking 'Start thread & close #{resource_name}' will post a thread and close the #{resource_name}" do
-          find(close_selector).click
+          click_button 'Start thread & close issue'
 
-          find(comments_selector, match: :first)
-          find("#{comments_selector}.system-note")
-          entries = all(comments_selector)
-          close_note = entries.last
-          new_discussion = entries[-2]
+          expect(page).to have_content(comment)
+          expect(page).to have_content "@#{user.username} closed"
+
+          new_discussion = all(comments_selector)[-2]
 
-          expect(close_note).to have_content 'closed'
           expect(new_discussion).to have_selector '.discussion'
         end
       end