Notify the user who set auto-merge when a build fails

app/helpers/todos_helper.rb

@@ -11,7 +11,7 @@ module TodosHelper
     case todo.action
     when Todo::ASSIGNED then 'assigned you'
     when Todo::MENTIONED then 'mentioned you on'
-    when Todo::BUILD_FAILED then 'The build failed for your'
+    when Todo::BUILD_FAILED then 'The build failed for'
     when Todo::MARKED then 'added a todo for'
     when Todo::APPROVAL_REQUIRED then 'set you as an approver for'
     end

app/services/todo_service.rb

@@ -98,10 +98,12 @@ class TodoService
 
   # When a build fails on the HEAD of a merge request we should:
   #
-  #  * create a todo for that user to fix it
+  #  * create a todo for author of MR to fix it
+  #  * create a todo for merge_user to keep an eye on it
   #
   def merge_request_build_failed(merge_request)
-    create_build_failed_todo(merge_request)
+    create_build_failed_todo(merge_request, merge_request.author)
+    create_build_failed_todo(merge_request, merge_request.merge_user) if merge_request.merge_when_build_succeeds?
   end
 
   # When a new commit is pushed to a merge request we should:
@@ -115,9 +117,11 @@ class TodoService
   # When a build is retried to a merge request we should:
   #
   #  * mark all pending todos related to the merge request for the author as done
+  #  * mark all pending todos related to the merge request for the merge_user as done
   #
   def merge_request_build_retried(merge_request)
     mark_pending_todos_as_done(merge_request, merge_request.author)
+    mark_pending_todos_as_done(merge_request, merge_request.merge_user) if merge_request.merge_when_build_succeeds?
   end
 
   # When create a note we should:
@@ -236,10 +240,9 @@ class TodoService
     create_todos(mentioned_users, attributes)
   end
 
-  def create_build_failed_todo(merge_request)
-    author = merge_request.author
-    attributes = attributes_for_todo(merge_request.project, merge_request, author, Todo::BUILD_FAILED)
-    create_todos(author, attributes)
+  def create_build_failed_todo(merge_request, todo_author)
+    attributes = attributes_for_todo(merge_request.project, merge_request, todo_author, Todo::BUILD_FAILED)
+    create_todos(todo_author, attributes)
   end
 
   def attributes_for_target(target)

changelogs/unreleased/23524-notify-automerge-user-of-failed-build.yml

+---
+title: Create a TODO for user who set auto-merge when a build fails
+merge_request: 
+author: 

spec/services/todo_service_spec.rb

@@ -469,6 +469,13 @@ describe TodoService, services: true do
 
         should_create_todo(user: author, target: mr_unassigned, action: Todo::BUILD_FAILED)
       end
+
+      it 'creates a pending todo for merge_user' do
+        mr_unassigned.update(merge_when_build_succeeds: true, merge_user: admin)
+        service.merge_request_build_failed(mr_unassigned)
+
+        should_create_todo(user: admin, author: admin, target: mr_unassigned, action: Todo::BUILD_FAILED)
+      end
     end
 
     describe '#merge_request_push' do