diff --git a/app/controllers/groups/boards_controller.rb b/app/controllers/groups/boards_controller.rb
index 6de77450a46..6fac6fcf426 100644
--- a/app/controllers/groups/boards_controller.rb
+++ b/app/controllers/groups/boards_controller.rb
@@ -11,8 +11,8 @@ class Groups::BoardsController < Groups::ApplicationController
     push_frontend_feature_flag(:board_multi_select, group, default_enabled: :yaml)
     push_frontend_feature_flag(:iteration_cadences, group, default_enabled: :yaml)
     experiment(:prominent_create_board_btn, subject: current_user) do |e|
-      e.use { }
-      e.try { }
+      e.control { }
+      e.candidate { }
     end.run
   end
 
diff --git a/app/controllers/projects/boards_controller.rb b/app/controllers/projects/boards_controller.rb
index adaa47b48cb..0170cff6160 100644
--- a/app/controllers/projects/boards_controller.rb
+++ b/app/controllers/projects/boards_controller.rb
@@ -11,8 +11,8 @@ class Projects::BoardsController < Projects::ApplicationController
     push_frontend_feature_flag(:board_multi_select, project, default_enabled: :yaml)
     push_frontend_feature_flag(:iteration_cadences, project&.group, default_enabled: :yaml)
     experiment(:prominent_create_board_btn, subject: current_user) do |e|
-      e.use { }
-      e.try { }
+      e.control { }
+      e.candidate { }
     end.run
   end
 
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index e88d1832480..7acf2220516 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -428,7 +428,7 @@ module ApplicationHelper
     experiment(:logged_out_marketing_header, actor: nil) do |e|
       html_class = 'logged-out-marketing-header-candidate'
       e.candidate { html_class }
-      e.try(:trial_focused) { html_class }
+      e.variant(:trial_focused) { html_class }
       e.control {}
       e.run
     end
diff --git a/app/helpers/ide_helper.rb b/app/helpers/ide_helper.rb
index 4d81aeca37a..bd1571f3956 100644
--- a/app/helpers/ide_helper.rb
+++ b/app/helpers/ide_helper.rb
@@ -34,7 +34,7 @@ module IdeHelper
 
   def enable_environments_guidance?
     experiment(:in_product_guidance_environments_webide, project: @project) do |e|
-      e.try { !has_dismissed_ide_environments_callout? }
+      e.candidate { !has_dismissed_ide_environments_callout? }
 
       e.run
     end
diff --git a/app/helpers/learn_gitlab_helper.rb b/app/helpers/learn_gitlab_helper.rb
index 6330b8fc829..7dfd9ed47e3 100644
--- a/app/helpers/learn_gitlab_helper.rb
+++ b/app/helpers/learn_gitlab_helper.rb
@@ -33,8 +33,8 @@ module LearnGitlabHelper
       actor: current_user,
       sticky_to: project.namespace
     ) do |e|
-      e.use { urls_to_use = action_urls }
-      e.try { urls_to_use = new_action_urls(project) }
+      e.control { urls_to_use = action_urls }
+      e.candidate { urls_to_use = new_action_urls(project) }
     end
 
     urls_to_use.to_h do |action, url|
diff --git a/app/services/projects/container_repository/delete_tags_service.rb b/app/services/projects/container_repository/delete_tags_service.rb
index 410cf6c624e..b4a57c70111 100644
--- a/app/services/projects/container_repository/delete_tags_service.rb
+++ b/app/services/projects/container_repository/delete_tags_service.rb
@@ -14,6 +14,7 @@ module Projects
 
         @tag_names = params[:tags]
         return error('not tags specified') if @tag_names.blank?
+        return error('repository importing') if @container_repository.migration_importing?
 
         delete_tags
       end
diff --git a/app/views/projects/_new_project_fields.html.haml b/app/views/projects/_new_project_fields.html.haml
index ac238878392..676af85b9d1 100644
--- a/app/views/projects/_new_project_fields.html.haml
+++ b/app/views/projects/_new_project_fields.html.haml
@@ -63,13 +63,13 @@
         = s_('ProjectsNew|Allows you to immediately clone this project’s repository. Skip this if you plan to push up an existing repository.')
 
   - experiment(:new_project_sast_enabled, user: current_user) do |e|
-    - e.try(:candidate) do
+    - e.variant(:candidate) do
       = render 'new_project_initialize_with_sast', experiment_name: e.name, track_label: track_label, checked: true, with_free_badge: false
-    - e.try(:unchecked_candidate) do
+    - e.variant(:unchecked_candidate) do
       = render 'new_project_initialize_with_sast', experiment_name: e.name, track_label: track_label, checked: false, with_free_badge: false
-    - e.try(:free_indicator) do
+    - e.variant(:free_indicator) do
       = render 'new_project_initialize_with_sast', experiment_name: e.name, track_label: track_label, checked: true, with_free_badge: true
-    - e.try(:unchecked_free_indicator) do
+    - e.variant(:unchecked_free_indicator) do
       = render 'new_project_initialize_with_sast', experiment_name: e.name, track_label: track_label, checked: false, with_free_badge: true
 
 = f.submit _('Create project'), class: "btn gl-button btn-confirm", data: { track_label: "#{track_label}", track_action: "click_button", track_property: "create_project", track_value: "" }
diff --git a/db/post_migrate/20220204053655_remove_index_epic_issues_on_epic_id.rb b/db/post_migrate/20220204053655_remove_index_epic_issues_on_epic_id.rb
new file mode 100644
index 00000000000..7815829d36a
--- /dev/null
+++ b/db/post_migrate/20220204053655_remove_index_epic_issues_on_epic_id.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+class RemoveIndexEpicIssuesOnEpicId < Gitlab::Database::Migration[1.0]
+  INDEX = 'index_epic_issues_on_epic_id'
+
+  disable_ddl_transaction!
+
+  def up
+    remove_concurrent_index_by_name :epic_issues, name: INDEX
+  end
+
+  def down
+    add_concurrent_index :epic_issues, :epic_id, name: INDEX
+  end
+end
diff --git a/db/schema_migrations/20220204053655 b/db/schema_migrations/20220204053655
new file mode 100644
index 00000000000..e096dae0c07
--- /dev/null
+++ b/db/schema_migrations/20220204053655
@@ -0,0 +1 @@
+d6b7fa6e5be83aa67bb479604bf6ddb9d8caae82fc8ea1ab7f34d5c534174ecf
\ No newline at end of file
diff --git a/db/structure.sql b/db/structure.sql
index a1cd7a08125..dad5942f213 100644
--- a/db/structure.sql
+++ b/db/structure.sql
@@ -26245,8 +26245,6 @@ CREATE UNIQUE INDEX index_epic_board_list_preferences_on_user_and_list ON boards
 
 CREATE UNIQUE INDEX index_epic_board_recent_visits_on_user_group_and_board ON boards_epic_board_recent_visits USING btree (user_id, group_id, epic_board_id);
 
-CREATE INDEX index_epic_issues_on_epic_id ON epic_issues USING btree (epic_id);
-
 CREATE INDEX index_epic_issues_on_epic_id_and_issue_id ON epic_issues USING btree (epic_id, issue_id);
 
 CREATE UNIQUE INDEX index_epic_issues_on_issue_id ON epic_issues USING btree (issue_id);
diff --git a/doc/user/project/index.md b/doc/user/project/index.md
index bee097cdcbe..801c2520bda 100644
--- a/doc/user/project/index.md
+++ b/doc/user/project/index.md
@@ -105,7 +105,6 @@ Projects include the following [features](https://about.gitlab.com/features/):
 - [License Compliance](../compliance/license_compliance/index.md): Approve and deny licenses for projects. **(ULTIMATE)**
 - [Dependency List](../application_security/dependency_list/index.md): View project dependencies. **(ULTIMATE)**
 - [Requirements](requirements/index.md): Create criteria to check your products against. **(ULTIMATE)**
-- [Static Site Editor](static_site_editor/index.md): Edit content on static websites without prior knowledge of the codebase or Git commands.
 - [Code Intelligence](code_intelligence.md): Navigate code.
 
 ## Project integrations
diff --git a/doc/user/project/static_site_editor/index.md b/doc/user/project/static_site_editor/index.md
index 50b1a3a929d..072f5bf1927 100644
--- a/doc/user/project/static_site_editor/index.md
+++ b/doc/user/project/static_site_editor/index.md
@@ -12,6 +12,14 @@ description: "The static site editor enables users to edit content on static web
 > - WYSIWYG editor [introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/214559) in GitLab 13.0.
 > - Non-Markdown content blocks not editable on the WYSIWYG mode [introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/216836) in GitLab 13.3.
 > - Formatting Markdown [introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/49052) in GitLab 13.7.
+> - [Deprecated](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/77246) in GitLab 14.7.
+
+WARNING:
+This feature is in its end-of-life process. It is
+[deprecated](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/77246)
+for use in GitLab 14.7, and is planned for
+[removal](https://gitlab.com/groups/gitlab-org/-/epics/7351) in GitLab 15.0.
+Users should instead use the [Web Editor](../repository/web_editor.md) or [Web IDE](../web_ide/index.md).
 
 Static Site Editor (SSE) enables users to edit content on static websites without
 prior knowledge of the underlying templating language, site architecture, or
diff --git a/lib/gitlab/regex.rb b/lib/gitlab/regex.rb
index b07b9c79858..a6491d23bf5 100644
--- a/lib/gitlab/regex.rb
+++ b/lib/gitlab/regex.rb
@@ -435,10 +435,6 @@ module Gitlab
       @utc_date_regex ||= /\A[0-9]{4}-[0-9]{2}-[0-9]{2}\z/.freeze
     end
 
-    def merge_request_wip
-      /(?i)(\[WIP\]\s*|WIP:\s*|\AWIP\z)/
-    end
-
     def merge_request_draft
       /\A(?i)(\[draft\]|\(draft\)|draft:)/
     end
diff --git a/spec/experiments/application_experiment_spec.rb b/spec/experiments/application_experiment_spec.rb
index 7c2b5382c42..8e06c06a5d1 100644
--- a/spec/experiments/application_experiment_spec.rb
+++ b/spec/experiments/application_experiment_spec.rb
@@ -359,8 +359,8 @@ RSpec.describe ApplicationExperiment, :experiment do
       end
 
       it "returns an assigned name" do
-        application_experiment.try(:variant1) {}
-        application_experiment.try(:variant2) {}
+        application_experiment.variant(:variant1) {}
+        application_experiment.variant(:variant2) {}
 
         expect(application_experiment.variant.name).to eq('variant2')
       end
@@ -395,8 +395,8 @@ RSpec.describe ApplicationExperiment, :experiment do
 
       cache.clear(key: application_experiment.name)
 
-      application_experiment.use { } # setup the control
-      application_experiment.try { } # setup the candidate
+      application_experiment.control { }
+      application_experiment.candidate { }
     end
 
     it "caches the variant determined by the variant resolver" do
diff --git a/spec/features/gitlab_experiments_spec.rb b/spec/features/gitlab_experiments_spec.rb
index ca772680ff6..af14b6e2e95 100644
--- a/spec/features/gitlab_experiments_spec.rb
+++ b/spec/features/gitlab_experiments_spec.rb
@@ -21,8 +21,8 @@ RSpec.describe "Gitlab::Experiment", :js do
       allow_next_instance_of(Admin::AbuseReportsController) do |instance|
         allow(instance).to receive(:index).and_wrap_original do |original|
           instance.experiment(:null_hypothesis, user: instance.current_user) do |e|
-            e.use { original.call }
-            e.try { original.call }
+            e.control { original.call }
+            e.candidate { original.call }
           end
         end
       end
diff --git a/spec/services/projects/container_repository/delete_tags_service_spec.rb b/spec/services/projects/container_repository/delete_tags_service_spec.rb
index 94037d6de1e..246ca301cfa 100644
--- a/spec/services/projects/container_repository/delete_tags_service_spec.rb
+++ b/spec/services/projects/container_repository/delete_tags_service_spec.rb
@@ -14,7 +14,7 @@ RSpec.describe Projects::ContainerRepository::DeleteTagsService do
     ]
   end
 
-  RSpec.shared_examples 'logging a success response' do
+  shared_examples 'logging a success response' do
     it 'logs an info message' do
       expect(service).to receive(:log_info).with(
         service_class: 'Projects::ContainerRepository::DeleteTagsService',
@@ -28,7 +28,7 @@ RSpec.describe Projects::ContainerRepository::DeleteTagsService do
     end
   end
 
-  RSpec.shared_examples 'logging an error response' do |message: 'could not delete tags', extra_log: {}|
+  shared_examples 'logging an error response' do |message: 'could not delete tags', extra_log: {}|
     it 'logs an error message' do
       log_data = {
           service_class: 'Projects::ContainerRepository::DeleteTagsService',
@@ -45,7 +45,7 @@ RSpec.describe Projects::ContainerRepository::DeleteTagsService do
     end
   end
 
-  RSpec.shared_examples 'calling the correct delete tags service' do |expected_service_class|
+  shared_examples 'calling the correct delete tags service' do |expected_service_class|
     let(:service_response) { { status: :success, deleted: tags } }
     let(:excluded_service_class) { available_service_classes.excluding(expected_service_class).first }
 
@@ -69,7 +69,7 @@ RSpec.describe Projects::ContainerRepository::DeleteTagsService do
     end
   end
 
-  RSpec.shared_examples 'handling invalid params' do
+  shared_examples 'handling invalid params' do
     context 'with invalid params' do
       before do
         expect(::Projects::ContainerRepository::Gitlab::DeleteTagsService).not_to receive(:new)
@@ -91,7 +91,7 @@ RSpec.describe Projects::ContainerRepository::DeleteTagsService do
     end
   end
 
-  RSpec.shared_examples 'supporting fast delete' do
+  shared_examples 'supporting fast delete' do
     context 'when the registry supports fast delete' do
       before do
         allow(repository.client).to receive(:supports_tag_delete?).and_return(true)
@@ -155,6 +155,14 @@ RSpec.describe Projects::ContainerRepository::DeleteTagsService do
 
         it_behaves_like 'handling invalid params'
       end
+
+      context 'when the repository is importing' do
+        before do
+          repository.update_columns(migration_state: 'importing', migration_import_started_at: Time.zone.now)
+        end
+
+        it { is_expected.to include(status: :error, message: 'repository importing') }
+      end
     end
 
     context 'without user' do
diff --git a/spec/support/shared_contexts/services/projects/container_repository/delete_tags_service_shared_context.rb b/spec/support/shared_contexts/services/projects/container_repository/delete_tags_service_shared_context.rb
index 21be989d697..e26b8cd8b37 100644
--- a/spec/support/shared_contexts/services/projects/container_repository/delete_tags_service_shared_context.rb
+++ b/spec/support/shared_contexts/services/projects/container_repository/delete_tags_service_shared_context.rb
@@ -3,7 +3,7 @@
 RSpec.shared_context 'container repository delete tags service shared context' do
   let_it_be(:user) { create(:user) }
   let_it_be(:project, reload: true) { create(:project, :private) }
-  let_it_be(:repository) { create(:container_repository, :root, project: project) }
+  let_it_be_with_reload(:repository) { create(:container_repository, :root, project: project) }
 
   let(:params) { { tags: tags } }