DEV: Fix spec typo

DEV: Fix spec typo

diff --git a/spec/integration/discourse_prometheus_alert_receiver/receiver_controller_spec.rb b/spec/integration/discourse_prometheus_alert_receiver/receiver_controller_spec.rb
index 4bcb792..ae3413d 100644
--- a/spec/integration/discourse_prometheus_alert_receiver/receiver_controller_spec.rb
+++ b/spec/integration/discourse_prometheus_alert_receiver/receiver_controller_spec.rb
@@ -553,7 +553,7 @@ RSpec.describe DiscoursePrometheusAlertReceiver::ReceiverController do
             post "/prometheus/receiver/#{token}", params: payload
           end.to change { AlertReceiverAlert.count }.by(1)
 
-          expect(topic.alert_receiver_alert.first.identifier).to eq('')
+          expect(topic.alert_receiver_alerts.first.identifier).to eq('')
         end
       end
 

GitHub sha: 360c937a