Add MR title & desc tracking events

Add basic tracking events for MR title and description changes

app/services/merge_requests/update_service.rb

@@ -87,8 +87,23 @@ module MergeRequests
       MergeRequests::CloseService
     end
 
+    def before_update(issuable, skip_spam_check: false)
+      return unless issuable.changed?
+
+      @issuable_changes = issuable.changes
+    end
+
     def after_update(issuable)
       issuable.cache_merge_request_closes_issues!(current_user)
+
+      return unless @issuable_changes
+
+      %w(title description).each do |action|
+        next unless @issuable_changes.key?(action)
+
+        Gitlab::UsageDataCounters::MergeRequestActivityUniqueCounter
+          .public_send("track_#{action}_edit_action".to_sym, user: current_user) # rubocop:disable GitlabSecurity/PublicSend
+      end
     end
 
     private

config/feature_flags/development/usage_data_i_code_review_edit_mr_desc.yml

+---
+name: usage_data_i_code_review_edit_mr_desc
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/issues/292830
+rollout_issue_url:
+milestone: '13.9'
+type: development
+group: group::code review
+default_enabled: true

config/feature_flags/development/usage_data_i_code_review_edit_mr_title.yml

+---
+name: usage_data_i_code_review_edit_mr_title
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/issues/292830
+rollout_issue_url:
+milestone: '13.9'
+type: development
+group: group::code review
+default_enabled: true

lib/gitlab/usage_data_counters/known_events/common.yml

@@ -496,6 +496,16 @@
   category: code_review
   aggregation: weekly
   feature_flag: usage_data_i_code_review_user_unresolve_thread
+- name: i_code_review_edit_mr_title
+  redis_slot: code_review
+  category: code_review
+  aggregation: weekly
+  feature_flag: usage_data_i_code_review_edit_mr_title
+- name: i_code_review_edit_mr_desc
+  redis_slot: code_review
+  category: code_review
+  aggregation: weekly
+  feature_flag: usage_data_i_code_review_edit_mr_desc
 - name: i_code_review_user_merge_mr
   redis_slot: code_review
   category: code_review

lib/gitlab/usage_data_counters/merge_request_activity_unique_counter.rb

@@ -24,6 +24,8 @@ module Gitlab
       MR_UNRESOLVE_THREAD_ACTION = 'i_code_review_user_unresolve_thread'
       MR_ASSIGNED_USERS_ACTION = 'i_code_review_user_assigned'
       MR_REVIEW_REQUESTED_USERS_ACTION = 'i_code_review_user_review_requested'
+      MR_EDIT_MR_TITLE_ACTION = 'i_code_review_edit_mr_title'
+      MR_EDIT_MR_DESC_ACTION = 'i_code_review_edit_mr_desc'
 
       class << self
         def track_mr_diffs_action(merge_request:)
@@ -98,6 +100,14 @@ module Gitlab
           track_unique_action_by_users(MR_REVIEW_REQUESTED_USERS_ACTION, users)
         end
 
+        def track_title_edit_action(user:)
+          track_unique_action_by_user(MR_EDIT_MR_TITLE_ACTION, user)
+        end
+
+        def track_description_edit_action(user:)
+          track_unique_action_by_user(MR_EDIT_MR_DESC_ACTION, user)
+        end
+
         private
 
         def track_unique_action_by_merge_request(action, merge_request)

spec/lib/gitlab/usage_data_counters/merge_request_activity_unique_counter_spec.rb

@@ -89,6 +89,22 @@ RSpec.describe Gitlab::UsageDataCounters::MergeRequestActivityUniqueCounter, :cl
     end
   end
 
+  describe '.track_title_edit_action' do
+    subject { described_class.track_title_edit_action(user: user) }
+
+    it_behaves_like 'a tracked merge request unique event' do
+      let(:action) { described_class::MR_EDIT_MR_TITLE_ACTION }
+    end
+  end
+
+  describe '.track_description_edit_action' do
+    subject { described_class.track_description_edit_action(user: user) }
+
+    it_behaves_like 'a tracked merge request unique event' do
+      let(:action) { described_class::MR_EDIT_MR_DESC_ACTION }
+    end
+  end
+
   describe '.track_create_comment_action' do
     subject { described_class.track_create_comment_action(note: note) }
 

spec/services/merge_requests/update_service_spec.rb

@@ -87,6 +87,19 @@ RSpec.describe MergeRequests::UpdateService, :mailer do
         expect(@merge_request.discussion_locked).to be_truthy
       end
 
+      context 'usage counters' do
+        let(:merge_request2) { create(:merge_request) }
+
+        it 'update as expected' do
+          expect(Gitlab::UsageDataCounters::MergeRequestActivityUniqueCounter)
+            .to receive(:track_title_edit_action).once.with(user: user)
+          expect(Gitlab::UsageDataCounters::MergeRequestActivityUniqueCounter)
+            .to receive(:track_description_edit_action).once.with(user: user)
+
+          MergeRequests::UpdateService.new(project, user, opts).execute(merge_request2)
+        end
+      end
+
       context 'updating milestone' do
         RSpec.shared_examples 'updates milestone' do
           it 'sets milestone' do