Add system note for alert when creating issue

app/helpers/system_note_helper.rb

@@ -32,7 +32,8 @@ module SystemNoteHelper
     'designs_modified' => 'doc-image',
     'designs_removed' => 'doc-image',
     'designs_discussion_added' => 'doc-image',
-    'status' => 'status'
+    'status' => 'status',
+    'alert_issue_added' => 'issues'
   }.freeze
 
   def system_note_icon_name(note)

app/models/system_note_metadata.rb

@@ -19,7 +19,7 @@ class SystemNoteMetadata < ApplicationRecord
     title time_tracking branch milestone discussion task moved
     opened closed merged duplicate locked unlocked outdated
     tag due_date pinned_embed cherry_pick health_status approved unapproved
-    status
+    status alert_issue_added
   ].freeze
 
   validates :note, presence: true

app/services/alert_management/create_alert_issue_service.rb

@@ -21,6 +21,8 @@ module AlertManagement
       return error(result.message, issue) if result.error?
       return error(object_errors(alert), issue) unless associate_alert_with_issue(issue)
 
+      SystemNoteService.new_alert_issue(alert, issue, user)
+
       result
     end
 

app/services/system_note_service.rb

@@ -296,6 +296,10 @@ module SystemNoteService
     ::SystemNotes::AlertManagementService.new(noteable: alert, project: alert.project, author: author).change_alert_status(alert)
   end
 
+  def new_alert_issue(alert, issue, author)
+    ::SystemNotes::AlertManagementService.new(noteable: alert, project: alert.project, author: author).new_alert_issue(alert, issue)
+  end
+
   private
 
   def merge_requests_service(noteable, project, author)

app/services/system_notes/alert_management_service.rb

@@ -17,5 +17,21 @@ module SystemNotes
 
       create_note(NoteSummary.new(noteable, project, author, body, action: 'status'))
     end
+
+    # Called when an issue is created based on an AlertManagement::Alert
+    #
+    # alert - AlertManagement::Alert object.
+    # issue - Issue object.
+    #
+    # Example Note text:
+    #
+    #   "created issue #17 for this alert"
+    #
+    # Returns the created Note object
+    def new_alert_issue(alert, issue)
+      body = "created issue #{issue.to_reference(project)} for this alert"
+
+      create_note(NoteSummary.new(noteable, project, author, body, action: 'alert_issue_added'))
+    end
   end
 end

changelogs/unreleased/sy-alert-issue-system-notes.yml

+---
+title: Add system note for alert when creating issue
+merge_request: 36370
+author:
+type: added

spec/services/alert_management/create_alert_issue_service_spec.rb

@@ -46,6 +46,10 @@ RSpec.describe AlertManagement::CreateAlertIssueService do
 
         expect(alert.reload.issue_id).to eq(created_issue.id)
       end
+
+      it 'creates a system note' do
+        expect { execute }.to change { alert.reload.notes.count }.by(1)
+      end
     end
 
     shared_examples 'setting an issue attributes' do

spec/services/system_note_service_spec.rb

@@ -693,4 +693,16 @@ RSpec.describe SystemNoteService do
       described_class.change_alert_status(alert, author)
     end
   end
+
+  describe '.new_alert_issue' do
+    let(:alert) { build(:alert_management_alert, :with_issue) }
+
+    it 'calls AlertManagementService' do
+      expect_next_instance_of(SystemNotes::AlertManagementService) do |service|
+        expect(service).to receive(:new_alert_issue).with(alert, alert.issue)
+      end
+
+      described_class.new_alert_issue(alert, alert.issue, author)
+    end
+  end
 end

spec/services/system_notes/alert_management_service_spec.rb

@@ -5,8 +5,7 @@ require 'spec_helper'
 RSpec.describe ::SystemNotes::AlertManagementService do
   let_it_be(:author)   { create(:user) }
   let_it_be(:project)  { create(:project, :repository) }
-
-  let(:noteable) { create(:alert_management_alert, :acknowledged, project: project) }
+  let_it_be(:noteable) { create(:alert_management_alert, :with_issue, :acknowledged, project: project) }
 
   describe '#change_alert_status' do
     subject { described_class.new(noteable: noteable, project: project, author: author).change_alert_status(noteable) }
@@ -19,4 +18,18 @@ RSpec.describe ::SystemNotes::AlertManagementService do
       expect(subject.note).to eq("changed the status to **Acknowledged**")
     end
   end
+
+  describe '#new_alert_issue' do
+    let_it_be(:issue) { noteable.issue }
+
+    subject { described_class.new(noteable: noteable, project: project, author: author).new_alert_issue(noteable, issue) }
+
+    it_behaves_like 'a system note' do
+      let(:action) { 'alert_issue_added' }
+    end
+
+    it 'has the appropriate message' do
+      expect(subject.note).to eq("created issue #{issue.to_reference(project)} for this alert")
+    end
+  end
 end