diff --git a/app/assets/javascripts/boards/components/sidebar/board_sidebar_labels_select.vue b/app/assets/javascripts/boards/components/sidebar/board_sidebar_labels_select.vue
index aedd695d07b..919ef0d3783 100644
--- a/app/assets/javascripts/boards/components/sidebar/board_sidebar_labels_select.vue
+++ b/app/assets/javascripts/boards/components/sidebar/board_sidebar_labels_select.vue
@@ -1,10 +1,12 @@
 <script>
 import { GlLabel } from '@gitlab/ui';
 import { mapGetters, mapActions } from 'vuex';
+import Api from '~/api';
 import BoardEditableItem from '~/boards/components/sidebar/board_editable_item.vue';
 import createFlash from '~/flash';
 import { getIdFromGraphQLId } from '~/graphql_shared/utils';
 import { isScopedLabel } from '~/lib/utils/common_utils';
+import { mergeUrlParams } from '~/lib/utils/url_utility';
 import { __ } from '~/locale';
 import LabelsSelect from '~/vue_shared/components/sidebar/labels_select_vue/labels_select_root.vue';
 
@@ -14,7 +16,13 @@ export default {
     LabelsSelect,
     GlLabel,
   },
-  inject: ['labelsFetchPath', 'labelsManagePath', 'labelsFilterBasePath'],
+  inject: {
+    labelsFetchPath: {
+      default: null,
+    },
+    labelsManagePath: {},
+    labelsFilterBasePath: {},
+  },
   data() {
     return {
       loading: false,
@@ -38,6 +46,32 @@ export default {
         scoped: isScopedLabel(label),
       }));
     },
+    fetchPath() {
+      /*
+       Labels fetched in epic boards are always group-level labels
+       and the correct path are passed from the backend (injected through labelsFetchPath)
+    
+       For issue boards, we should always include project-level labels and use a different endpoint.
+       (it requires knowing the project path of a selected issue.)
+    
+       Note 1. that we will be using GraphQL to fetch labels when we create a labels select widget.
+       And this component will be removed _wholesale_ https://gitlab.com/gitlab-org/gitlab/-/issues/300653.
+
+       Note 2. Moreover, 'fetchPath' needs to be used as a key for 'labels-select' component to force updates.
+       'labels-select' has its own vuex store and initializes the passed props as states
+       and these states aren't reactively bound to the passed props.
+      */
+
+      const projectLabelsFetchPath = mergeUrlParams(
+        { include_ancestor_groups: true },
+        Api.buildUrl(Api.projectLabelsPath).replace(
+          ':namespace_path/:project_path',
+          this.projectPathForActiveIssue,
+        ),
+      );
+
+      return this.labelsFetchPath || projectLabelsFetchPath;
+    },
   },
   methods: {
     ...mapActions(['setActiveBoardItemLabels']),
@@ -100,12 +134,13 @@ export default {
     <template #default="{ edit }">
       <labels-select
         ref="labelsSelect"
+        :key="fetchPath"
         :allow-label-edit="false"
         :allow-label-create="false"
         :allow-multiselect="true"
         :allow-scoped-labels="true"
         :selected-labels="selectedLabels"
-        :labels-fetch-path="labelsFetchPath"
+        :labels-fetch-path="fetchPath"
         :labels-manage-path="labelsManagePath"
         :labels-filter-base-path="labelsFilterBasePath"
         :labels-list-title="__('Select label')"
diff --git a/app/assets/javascripts/boards/index.js b/app/assets/javascripts/boards/index.js
index 53825d2c045..1888645ef78 100644
--- a/app/assets/javascripts/boards/index.js
+++ b/app/assets/javascripts/boards/index.js
@@ -97,7 +97,6 @@ export default () => {
       currentUserId: gon.current_user_id || null,
       canUpdate: parseBoolean($boardApp.dataset.canUpdate),
       canAdminList: parseBoolean($boardApp.dataset.canAdminList),
-      labelsFetchPath: $boardApp.dataset.labelsFetchPath,
       labelsManagePath: $boardApp.dataset.labelsManagePath,
       labelsFilterBasePath: $boardApp.dataset.labelsFilterBasePath,
       timeTrackingLimitToHours: parseBoolean($boardApp.dataset.timeTrackingLimitToHours),
diff --git a/app/assets/javascripts/pipelines/components/graph/graph_component_wrapper.vue b/app/assets/javascripts/pipelines/components/graph/graph_component_wrapper.vue
index 4bef6f66be2..9329a35ba99 100644
--- a/app/assets/javascripts/pipelines/components/graph/graph_component_wrapper.vue
+++ b/app/assets/javascripts/pipelines/components/graph/graph_component_wrapper.vue
@@ -7,7 +7,7 @@ import glFeatureFlagMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
 import { DEFAULT, DRAW_FAILURE, LOAD_FAILURE } from '../../constants';
 import DismissPipelineGraphCallout from '../../graphql/mutations/dismiss_pipeline_notification.graphql';
 import getUserCallouts from '../../graphql/queries/get_user_callouts.query.graphql';
-import { reportToSentry } from '../../utils';
+import { reportToSentry, reportMessageToSentry } from '../../utils';
 import { listByLayers } from '../parsing_utils';
 import { IID_FAILURE, LAYER_VIEW, STAGE_VIEW, VIEW_TYPE_KEY } from './constants';
 import PipelineGraph from './graph_component.vue';
@@ -109,14 +109,16 @@ export default {
       },
       error(err) {
         this.reportFailure({ type: LOAD_FAILURE, skipSentry: true });
-        reportToSentry(
+
+        reportMessageToSentry(
           this.$options.name,
-          `| type: ${LOAD_FAILURE} |  
-          | rawError: ${JSON.stringify(err)} | 
-          | info: ${serializeLoadErrors(err)} | 
-          | graphqlResourceEtag: ${this.graphqlResourceEtag} | 
-          | projectPath: ${this.projectPath} | 
-          | iid: ${this.pipelineIid} |`,
+          `| type: ${LOAD_FAILURE} , info: ${serializeLoadErrors(err)}`,
+          {
+            projectPath: this.projectPath,
+            pipelineIid: this.pipelineIid,
+            pipelineStages: this.pipeline?.stages?.length || 0,
+            nbOfDownstreams: this.pipeline?.downstream?.length || 0,
+          },
         );
       },
       result({ error }) {
diff --git a/app/assets/javascripts/pipelines/components/graph/utils.js b/app/assets/javascripts/pipelines/components/graph/utils.js
index 373aa6bf9a1..163b3898c28 100644
--- a/app/assets/javascripts/pipelines/components/graph/utils.js
+++ b/app/assets/javascripts/pipelines/components/graph/utils.js
@@ -1,3 +1,4 @@
+import { isEmpty } from 'lodash';
 import Visibility from 'visibilityjs';
 import { getIdFromGraphQLId } from '~/graphql_shared/utils';
 import { unwrapStagesWithNeedsAndLookup } from '../unwrapping_utils';
@@ -39,15 +40,15 @@ const serializeGqlErr = (gqlError) => {
 const serializeLoadErrors = (errors) => {
   const { gqlError, graphQLErrors, networkError, message } = errors;
 
-  if (graphQLErrors) {
+  if (!isEmpty(graphQLErrors)) {
     return graphQLErrors.map((err) => serializeGqlErr(err)).join('; ');
   }
 
-  if (gqlError) {
+  if (!isEmpty(gqlError)) {
     return serializeGqlErr(gqlError);
   }
 
-  if (networkError) {
+  if (!isEmpty(networkError)) {
     return `Network error: ${networkError.message}`;
   }
 
diff --git a/app/assets/javascripts/pipelines/utils.js b/app/assets/javascripts/pipelines/utils.js
index 0a6c326fa3d..800a363cada 100644
--- a/app/assets/javascripts/pipelines/utils.js
+++ b/app/assets/javascripts/pipelines/utils.js
@@ -73,3 +73,12 @@ export const reportToSentry = (component, failureType) => {
     Sentry.captureException(failureType);
   });
 };
+
+export const reportMessageToSentry = (component, message, context) => {
+  Sentry.withScope((scope) => {
+    // eslint-disable-next-line @gitlab/require-i18n-strings
+    scope.setContext('Vue data', context);
+    scope.setTag('component', component);
+    Sentry.captureMessage(message);
+  });
+};
diff --git a/doc/user/project/code_owners.md b/doc/user/project/code_owners.md
index 4fb65608b58..ea7bcce99c1 100644
--- a/doc/user/project/code_owners.md
+++ b/doc/user/project/code_owners.md
@@ -22,19 +22,19 @@ The GitLab Code Owners feature defines who owns specific
 files or paths in a repository, allowing other users to understand
 who is responsible for each file or path.
 
+As an alternative to using Code Owners for approvals, you can instead
+[configure rules](merge_requests/approvals/rules.md).
+
 ## Why is this useful?
 
 Code Owners allows for a version controlled, single source of
 truth file outlining the exact GitLab users or groups that
-own certain files or paths in a repository. Code Owners can be
-used in the merge request approval process which can streamline
-the process of finding the right reviewers and approvers for a given
-merge request.
-
-In larger organizations or popular open source projects, Code Owners
-can help you understand who to contact if you have
-a question that may not be related to code review or a merge request
-approval.
+own certain files or paths in a repository. In larger organizations
+or popular open source projects, Code Owners can help you understand 
+who to contact if you have a question about a specific portion of
+the codebase. Code Owners can also streamline the merge request approval
+process, identifying the most relevant reviewers and approvers for a
+given change.
 
 ## How to set up Code Owners
 
diff --git a/doc/user/project/merge_requests/approvals/index.md b/doc/user/project/merge_requests/approvals/index.md
index aa668e85156..1f64eee033c 100644
--- a/doc/user/project/merge_requests/approvals/index.md
+++ b/doc/user/project/merge_requests/approvals/index.md
@@ -10,14 +10,15 @@ disqus_identifier: 'https://docs.gitlab.com/ee/user/project/merge_requests/merge
 
 > Redesign [introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/1979) in [GitLab Premium](https://about.gitlab.com/pricing/) 11.8 and [feature flag removed](https://gitlab.com/gitlab-org/gitlab/-/issues/10685) in 12.0.
 
-Successful projects depend on code reviews. Merge request approvals clearly communicate
-someone's ability to merge proposed changes. Approvals [are optional](#optional-approvals)
-in GitLab Free, but you can require them for your project in higher tiers.
+You can configure your merge requests so that they must be approved before
+they can be merged. You can do this by creating [rules](rules.md) or by specifying
+a list of users who act as [code owners](../../code_owners.md) for specific files.
 
-Merge request approvals are configured at the project level. Administrator users
-of self-managed GitLab installations can also configure
-[instance-level approval rules](../../../admin_area/merge_requests_approvals.md)
-that cannot be overridden on a project-level basis.
+You can configure merge request approvals for each project. In higher GitLab tiers,
+Administrators of self-managed GitLab instances can configure approvals
+[for the entire instance](../../../admin_area/merge_requests_approvals.md).
+
+## How approvals work
 
 With [merge request approval rules](rules.md), you can set the minimum number of
 required approvals before work can merge into your project. You can also extend these
diff --git a/spec/features/boards/sidebar_labels_in_namespaces_spec.rb b/spec/features/boards/sidebar_labels_in_namespaces_spec.rb
new file mode 100644
index 00000000000..8395a0b33c0
--- /dev/null
+++ b/spec/features/boards/sidebar_labels_in_namespaces_spec.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'Issue boards sidebar labels select', :js do
+  include BoardHelpers
+
+  include_context 'labels from nested groups and projects'
+
+  let(:card) { find('.board:nth-child(1)').first('[data-testid="board_card"]') }
+
+  context 'group boards' do
+    context 'in the top-level group board' do
+      let_it_be(:group_board) { create(:board, group: group) }
+      let_it_be(:board_list) { create(:backlog_list, board: group_board) }
+
+      before do
+        load_board group_board_path(group, group_board)
+      end
+
+      context 'selecting an issue from a direct descendant project' do
+        let_it_be(:project_issue) { create(:issue, project: project) }
+
+        include_examples 'an issue from a direct descendant project is selected'
+      end
+
+      context "selecting an issue from a subgroup's project" do
+        let_it_be(:subproject_issue) { create(:issue, project: subproject) }
+
+        include_examples "an issue from a subgroup's project is selected"
+      end
+    end
+  end
+end
diff --git a/spec/features/boards/sub_group_project_spec.rb b/spec/features/boards/sub_group_project_spec.rb
deleted file mode 100644
index bde5f061a67..00000000000
--- a/spec/features/boards/sub_group_project_spec.rb
+++ /dev/null
@@ -1,46 +0,0 @@
-# frozen_string_literal: true
-
-require 'spec_helper'
-
-RSpec.describe 'Sub-group project issue boards', :js do
-  let(:group) { create(:group) }
-  let(:nested_group_1) { create(:group, parent: group) }
-  let(:project) { create(:project, group: nested_group_1) }
-  let(:board) { create(:board, project: project) }
-  let(:label) { create(:label, project: project) }
-  let(:user) { create(:user) }
-  let!(:list1) { create(:list, board: board, label: label, position: 0) }
-  let!(:issue) { create(:labeled_issue, project: project, labels: [label]) }
-
-  before do
-    project.add_maintainer(user)
-
-    sign_in(user)
-
-    visit project_board_path(project, board)
-    wait_for_requests
-  end
-
-  # TODO https://gitlab.com/gitlab-org/gitlab/-/issues/324290
-  xit 'creates new label from sidebar' do
-    find('.board-card').click
-
-    page.within '.labels' do
-      click_link 'Edit'
-      click_link 'Create project label'
-    end
-
-    page.within '.dropdown-new-label' do
-      fill_in 'new_label_name', with: 'test label'
-      first('.suggest-colors-dropdown a').click
-
-      click_button 'Create'
-
-      wait_for_requests
-    end
-
-    page.within '.labels' do
-      expect(page).to have_link 'test label'
-    end
-  end
-end
diff --git a/spec/features/profiles/user_visits_notifications_tab_spec.rb b/spec/features/profiles/user_visits_notifications_tab_spec.rb
index 939e791c75d..e960cc76219 100644
--- a/spec/features/profiles/user_visits_notifications_tab_spec.rb
+++ b/spec/features/profiles/user_visits_notifications_tab_spec.rb
@@ -12,6 +12,14 @@ RSpec.describe 'User visits the notifications tab', :js do
     visit(profile_notifications_path)
   end
 
+  it 'turns on the receive product marketing emails setting' do
+    expect(page).to have_content('Notifications')
+
+    expect do
+      check 'Receive product marketing emails'
+    end.to change { user.reload.email_opted_in }.to(true)
+  end
+
   it 'changes the project notifications setting' do
     expect(page).to have_content('Notifications')
 
diff --git a/spec/frontend/boards/components/sidebar/board_sidebar_labels_select_spec.js b/spec/frontend/boards/components/sidebar/board_sidebar_labels_select_spec.js
index 153d0640b23..ad682774ee6 100644
--- a/spec/frontend/boards/components/sidebar/board_sidebar_labels_select_spec.js
+++ b/spec/frontend/boards/components/sidebar/board_sidebar_labels_select_spec.js
@@ -1,7 +1,11 @@
 import { GlLabel } from '@gitlab/ui';
 import { shallowMount } from '@vue/test-utils';
 import { TEST_HOST } from 'helpers/test_constants';
-import { labels as TEST_LABELS, mockIssue as TEST_ISSUE } from 'jest/boards/mock_data';
+import {
+  labels as TEST_LABELS,
+  mockIssue as TEST_ISSUE,
+  mockIssueFullPath as TEST_ISSUE_FULLPATH,
+} from 'jest/boards/mock_data';
 import BoardEditableItem from '~/boards/components/sidebar/board_editable_item.vue';
 import BoardSidebarLabelsSelect from '~/boards/components/sidebar/board_sidebar_labels_select.vue';
 import { createStore } from '~/boards/stores';
@@ -23,7 +27,7 @@ describe('~/boards/components/sidebar/board_sidebar_labels_select.vue', () => {
     wrapper = null;
   });
 
-  const createWrapper = ({ labels = [] } = {}) => {
+  const createWrapper = ({ labels = [], providedValues = {} } = {}) => {
     store = createStore();
     store.state.boardItems = { [TEST_ISSUE.id]: { ...TEST_ISSUE, labels } };
     store.state.activeId = TEST_ISSUE.id;
@@ -32,9 +36,9 @@ describe('~/boards/components/sidebar/board_sidebar_labels_select.vue', () => {
       store,
       provide: {
         canUpdate: true,
-        labelsFetchPath: TEST_HOST,
         labelsManagePath: TEST_HOST,
         labelsFilterBasePath: TEST_HOST,
+        ...providedValues,
       },
       stubs: {
         BoardEditableItem,
@@ -48,6 +52,22 @@ describe('~/boards/components/sidebar/board_sidebar_labels_select.vue', () => {
     wrapper.findAll(GlLabel).wrappers.map((item) => item.props('title'));
   const findCollapsed = () => wrapper.find('[data-testid="collapsed-content"]');
 
+  describe('when labelsFetchPath is provided', () => {
+    it('uses injected labels fetch path', () => {
+      createWrapper({ providedValues: { labelsFetchPath: 'foobar' } });
+
+      expect(findLabelsSelect().props('labelsFetchPath')).toEqual('foobar');
+    });
+  });
+
+  it('uses the default project label endpoint', () => {
+    createWrapper();
+
+    expect(findLabelsSelect().props('labelsFetchPath')).toEqual(
+      `/${TEST_ISSUE_FULLPATH}/-/labels?include_ancestor_groups=true`,
+    );
+  });
+
   it('renders "None" when no labels are selected', () => {
     createWrapper();
 
@@ -78,7 +98,7 @@ describe('~/boards/components/sidebar/board_sidebar_labels_select.vue', () => {
     it('commits change to the server', () => {
       expect(wrapper.vm.setActiveBoardItemLabels).toHaveBeenCalledWith({
         addLabelIds: TEST_LABELS.map((label) => label.id),
-        projectPath: 'gitlab-org/test-subgroup/gitlab-test',
+        projectPath: TEST_ISSUE_FULLPATH,
         removeLabelIds: [],
       });
     });
@@ -103,7 +123,7 @@ describe('~/boards/components/sidebar/board_sidebar_labels_select.vue', () => {
       expect(wrapper.vm.setActiveBoardItemLabels).toHaveBeenCalledWith({
         addLabelIds: [5, 7],
         removeLabelIds: [6],
-        projectPath: 'gitlab-org/test-subgroup/gitlab-test',
+        projectPath: TEST_ISSUE_FULLPATH,
       });
     });
   });
@@ -122,7 +142,7 @@ describe('~/boards/components/sidebar/board_sidebar_labels_select.vue', () => {
 
       expect(wrapper.vm.setActiveBoardItemLabels).toHaveBeenCalledWith({
         removeLabelIds: [getIdFromGraphQLId(testLabel.id)],
-        projectPath: 'gitlab-org/test-subgroup/gitlab-test',
+        projectPath: TEST_ISSUE_FULLPATH,
       });
     });
   });
diff --git a/spec/frontend/boards/mock_data.js b/spec/frontend/boards/mock_data.js
index 1c5b7cf8248..bcaca9522e4 100644
--- a/spec/frontend/boards/mock_data.js
+++ b/spec/frontend/boards/mock_data.js
@@ -151,6 +151,8 @@ export const rawIssue = {
   },
 };
 
+export const mockIssueFullPath = 'gitlab-org/test-subgroup/gitlab-test';
+
 export const mockIssue = {
   id: 'gid://gitlab/Issue/436',
   iid: '27',
@@ -159,8 +161,8 @@ export const mockIssue = {
   timeEstimate: 0,
   weight: null,
   confidential: false,
-  referencePath: 'gitlab-org/test-subgroup/gitlab-test#27',
-  path: '/gitlab-org/test-subgroup/gitlab-test/-/issues/27',
+  referencePath: `${mockIssueFullPath}#27`,
+  path: `/${mockIssueFullPath}/-/issues/27`,
   assignees,
   labels: [
     {
diff --git a/spec/support/helpers/board_helpers.rb b/spec/support/helpers/board_helpers.rb
index dff3f9d976c..c4e69d06f52 100644
--- a/spec/support/helpers/board_helpers.rb
+++ b/spec/support/helpers/board_helpers.rb
@@ -7,4 +7,20 @@ module BoardHelpers
       wait_for_requests
     end
   end
+
+  def load_board(board_path)
+    visit board_path
+
+    wait_for_requests
+  end
+
+  def click_card_and_edit_label
+    click_card(card)
+
+    page.within(labels_select) do
+      click_button 'Edit'
+
+      wait_for_requests
+    end
+  end
 end
diff --git a/spec/support/shared_examples/features/board_sidebar_labels_examples.rb b/spec/support/shared_examples/features/board_sidebar_labels_examples.rb
new file mode 100644
index 00000000000..520980c2615
--- /dev/null
+++ b/spec/support/shared_examples/features/board_sidebar_labels_examples.rb
@@ -0,0 +1,77 @@
+# frozen_string_literal: true
+
+RSpec.shared_context 'labels from nested groups and projects' do
+  let_it_be(:group) { create(:group) }
+  let_it_be(:group_label) { create(:group_label, group: group, name: 'Group label') }
+  let_it_be(:project) { create(:project, group: group) }
+  let_it_be(:project_label) { create(:label, project: project, name: 'Project label') }
+
+  let_it_be(:subgroup) { create(:group, parent: group) }
+  let_it_be(:subgroup_label) { create(:group_label, group: subgroup, name: 'Subgroup label') }
+  let_it_be(:subproject) { create(:project, group: subgroup) }
+  let_it_be(:subproject_label) { create(:label, project: subproject, name: 'Subproject label') }
+
+  let_it_be(:subgroup2) { create(:group, parent: group) }
+  let_it_be(:subgroup2_label) { create(:group_label, group: subgroup2, name: 'Subgroup2 label') }
+
+  let_it_be(:maintainer) { create(:user) }
+
+  let(:labels_select) { find("[data-testid='sidebar-labels']") }
+  let(:labels_dropdown) { labels_select.find('[data-testid="dropdown-content"]')}
+
+  before do
+    group.add_maintainer(maintainer)
+
+    sign_in(maintainer)
+  end
+end
+
+RSpec.shared_examples "an issue from a subgroup's project is selected" do
+  context 'when editing labels' do
+    before do
+      click_card_and_edit_label
+    end
+
+    it 'displays the label from the top-level group' do
+      expect(labels_dropdown).to have_content(group_label.name)
+    end
+
+    it 'displays the label from the subgroup' do
+      expect(labels_dropdown).to have_content(subgroup_label.name)
+    end
+
+    it 'displays the label from the project' do
+      expect(labels_dropdown).to have_content(subproject_label.name)
+    end
+
+    it "does not display labels from the subgroup's siblings (project or group)" do
+      aggregate_failures do
+        expect(labels_dropdown).not_to have_content(project_label.name)
+        expect(labels_dropdown).not_to have_content(subgroup2_label.name)
+      end
+    end
+  end
+end
+
+RSpec.shared_examples 'an issue from a direct descendant project is selected' do
+  context 'when editing labels' do
+    before do
+      click_card_and_edit_label
+    end
+
+    it 'displays the label from the top-level group' do
+      expect(labels_dropdown).to have_content(group_label.name)
+    end
+
+    it 'displays the label from the project' do
+      expect(labels_dropdown).to have_content(project_label.name)
+    end
+
+    it "does not display labels from the project's siblings or their descendents" do
+      aggregate_failures do
+        expect(labels_dropdown).not_to have_content(subgroup_label.name)
+        expect(labels_dropdown).not_to have_content(subproject_label.name)
+      end
+    end
+  end
+end