1 files changed, 14 insertions, 0 deletions

diff --git a/app/services/issues/close_service.rb b/app/services/issues/close_service.rb
index 14585c2850b..ce955b07648 100644
--- a/app/services/issues/close_service.rb
+++ b/app/services/issues/close_service.rb
@@ -36,6 +36,8 @@ module Issues
         execute_hooks(issue, 'close')
         invalidate_cache_counts(issue, users: issue.assignees)
         issue.update_project_counter_caches
+
+        store_first_mentioned_in_commit_at(issue, closed_via) if closed_via.is_a?(MergeRequest)
       end
 
       issue
@@ -46,5 +48,17 @@ module Issues
     def create_note(issue, current_commit)
       SystemNoteService.change_status(issue, issue.project, current_user, issue.state, current_commit)
     end
+
+    def store_first_mentioned_in_commit_at(issue, merge_request)
+      return unless Feature.enabled?(:store_first_mentioned_in_commit_on_issue_close, issue.project)
+
+      metrics = issue.metrics
+      return if metrics.nil? || metrics.first_mentioned_in_commit_at
+
+      first_commit_timestamp = merge_request.commits(limit: 1).first&.date
+      return unless first_commit_timestamp
+
+      metrics.update!(first_mentioned_in_commit_at: first_commit_timestamp)
+    end
   end
 end