diff --git a/app/assets/javascripts/merge_requests/components/reviewers/reviewer_dropdown.vue b/app/assets/javascripts/merge_requests/components/reviewers/reviewer_dropdown.vue
index 7cbb528de5bd7d8079b49311d16eaea20d496c61..218e782717a7e52b07256a0bff517022d35bc56e 100644
--- a/app/assets/javascripts/merge_requests/components/reviewers/reviewer_dropdown.vue
+++ b/app/assets/javascripts/merge_requests/components/reviewers/reviewer_dropdown.vue
@@ -9,7 +9,11 @@ import { convertToGraphQLId } from '~/graphql_shared/utils';
 import userAutocompleteWithMRPermissionsQuery from '~/graphql_shared/queries/project_autocomplete_users_with_mr_permissions.query.graphql';
 import InviteMembersTrigger from '~/invite_members/components/invite_members_trigger.vue';
 
-import { SEARCH_SELECT_REVIEWER_EVENT, SELECT_REVIEWER_EVENT } from '../../constants';
+import {
+  REQUEST_REVIEW_SIMPLE,
+  SEARCH_SELECT_REVIEWER_EVENT,
+  SELECT_REVIEWER_EVENT,
+} from '../../constants';
 
 import UpdateReviewers from './update_reviewers.vue';
 import userPermissionsQuery from './queries/user_permissions.query.graphql';
@@ -57,6 +61,11 @@ export default {
       required: false,
       default: () => [],
     },
+    usage: {
+      type: String,
+      required: false,
+      default: () => 'complex',
+    },
   },
   data() {
     return {
@@ -178,6 +187,10 @@ export default {
     processReviewers(updateReviewers) {
       this.trackReviewersSelectEvent();
       updateReviewers();
+
+      if (this.usage === 'simple') {
+        this.trackEvent(REQUEST_REVIEW_SIMPLE);
+      }
     },
   },
   i18n: {
diff --git a/app/assets/javascripts/merge_requests/constants.js b/app/assets/javascripts/merge_requests/constants.js
index 05d39b28d2790ca7a6f1531fedd9aa4b58aa6fb4..6e4fc730f4f0d69053e335339b53f9ccd5e07ff7 100644
--- a/app/assets/javascripts/merge_requests/constants.js
+++ b/app/assets/javascripts/merge_requests/constants.js
@@ -2,3 +2,4 @@ export const MAX_LIST_SIZE = 10;
 
 export const SELECT_REVIEWER_EVENT = 'user_selects_reviewer_from_mr_sidebar';
 export const SEARCH_SELECT_REVIEWER_EVENT = 'user_selects_reviewer_from_mr_sidebar_after_search';
+export const REQUEST_REVIEW_SIMPLE = 'user_requests_review_from_mr_simple_sidebar';
diff --git a/app/assets/javascripts/sidebar/components/reviewers/reviewer_title.vue b/app/assets/javascripts/sidebar/components/reviewers/reviewer_title.vue
index 21d0dae4ecc0c1c9842560dec6d94db76d13b399..6cb0e78c7ae682f83bd723952c7ca14e14e2a66c 100644
--- a/app/assets/javascripts/sidebar/components/reviewers/reviewer_title.vue
+++ b/app/assets/javascripts/sidebar/components/reviewers/reviewer_title.vue
@@ -52,6 +52,7 @@ export default {
     <template v-if="editable">
       <reviewer-dropdown
         class="gl-ml-auto"
+        usage="simple"
         :selected-reviewers="reviewers"
         :visible-reviewers="reviewers"
       />
diff --git a/config/events/user_requests_review_from_mr_simple_sidebar.yml b/config/events/user_requests_review_from_mr_simple_sidebar.yml
new file mode 100644
index 0000000000000000000000000000000000000000..6b6eb49f37193e4f5d070d17a1d80a04b41a6f06
--- /dev/null
+++ b/config/events/user_requests_review_from_mr_simple_sidebar.yml
@@ -0,0 +1,17 @@
+---
+description: Number of times a user uses the right (simple) sidebar on an MR to request a reviewer
+internal_events: true
+action: user_requests_review_from_mr_simple_sidebar
+identifiers:
+- project
+- namespace
+- user
+product_group: code_review
+product_categories:
+- code_review_workflow
+milestone: '17.11'
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/186907
+tiers:
+- free
+- premium
+- ultimate
diff --git a/config/metrics/counts_all/count_total_user_requests_review_from_mr_simple_sidebar.yml b/config/metrics/counts_all/count_total_user_requests_review_from_mr_simple_sidebar.yml
new file mode 100644
index 0000000000000000000000000000000000000000..baa3587021fcb4a93d7dcf00306a531cef5e9ff2
--- /dev/null
+++ b/config/metrics/counts_all/count_total_user_requests_review_from_mr_simple_sidebar.yml
@@ -0,0 +1,23 @@
+---
+key_path: counts.count_total_user_requests_review_from_mr_simple_sidebar
+description: Count of times a user uses the MR simple sidebar to request a reviewer
+product_group: code_review
+product_categories:
+- code_review_workflow
+performance_indicator_type: []
+value_type: number
+status: active
+milestone: '17.11'
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/186907
+time_frame:
+- 28d
+- 7d
+- all
+data_source: internal_events
+data_category: optional
+tiers:
+- free
+- premium
+- ultimate
+events:
+- name: user_requests_review_from_mr_simple_sidebar
diff --git a/spec/frontend/merge_requests/components/reviewers/reviewer_dropdown_spec.js b/spec/frontend/merge_requests/components/reviewers/reviewer_dropdown_spec.js
index 240b00c71f21bc0dd7bf106e786881116eef45a3..f9af086b0bcfaf42b44f334d670305c957498418 100644
--- a/spec/frontend/merge_requests/components/reviewers/reviewer_dropdown_spec.js
+++ b/spec/frontend/merge_requests/components/reviewers/reviewer_dropdown_spec.js
@@ -275,6 +275,37 @@ describe('Reviewer dropdown component', () => {
           undefined,
         );
       });
+
+      it('does not send the "simple sidebar" tracking event when used "normally" (in complex mode)', () => {
+        findDropdown().vm.$emit('select', ['bob']);
+        findDropdown().vm.$emit('hidden');
+
+        expect(trackEventSpy).not.toHaveBeenCalledWith(
+          'user_requests_review_from_mr_simple_sidebar',
+          {},
+          undefined,
+        );
+      });
+
+      describe('simple sidebar usage (without using the reviewers panel)', () => {
+        it('sends the "simple sidebar" tracking event', async () => {
+          createComponent(true, {
+            users: [createMockUser(), createMockUser({ id: 2, name: 'Nonadmin', username: 'bob' })],
+            usage: 'simple',
+          });
+
+          await waitForPromises();
+
+          findDropdown().vm.$emit('select', ['bob']);
+          findDropdown().vm.$emit('hidden');
+
+          expect(trackEventSpy).toHaveBeenCalledWith(
+            'user_requests_review_from_mr_simple_sidebar',
+            {},
+            undefined,
+          );
+        });
+      });
     });
   });