Add method to notify about failed auto SSL

app/services/notification_service.rb

@@ -489,6 +489,12 @@ class NotificationService
     end
   end
 
+  def pages_domain_auto_ssl_failed(domain)
+    project_maintainers_recipients(domain, action: 'disabled').each do |recipient|
+      mailer.pages_domain_auto_ssl_failed_email(domain, recipient.user).deliver_later
+    end
+  end
+
   def issue_due(issue)
     recipients = NotificationRecipients::BuildService.build_recipients(
       issue,

spec/services/notification_service_spec.rb

@@ -2604,6 +2604,7 @@ describe NotificationService, :mailer do
       pages_domain_disabled
       pages_domain_verification_succeeded
       pages_domain_verification_failed
+      pages_domain_auto_ssl_failed
     ].each do |sym|
       describe "##{sym}" do
         subject(:notify!) { notification.send(sym, domain) }