Resolve Prometheus alerts based on setting

Check auto_close_incident operations setting before resolve
Prometheus alerts

app/services/alert_management/process_prometheus_alert_service.rb

@@ -3,6 +3,7 @@
 module AlertManagement
   class ProcessPrometheusAlertService < BaseService
     include Gitlab::Utils::StrongMemoize
+    include ::IncidentManagement::Settings
 
     def execute
       return bad_request unless parsed_alert.valid?
@@ -69,6 +70,7 @@ module AlertManagement
 
     def process_resolved_alert_management_alert
       return if am_alert.blank?
+      return unless auto_close_incident?
 
       if am_alert.resolve(ends_at)
         close_issue(am_alert.issue)

app/services/concerns/incident_management/settings.rb

@@ -16,5 +16,9 @@ module IncidentManagement
     def process_issues?
       incident_management_setting.create_issue?
     end
+
+    def auto_close_incident?
+      incident_management_setting.auto_close_incident?
+    end
   end
 end

spec/services/alert_management/process_prometheus_alert_service_spec.rb

@@ -3,7 +3,7 @@
 require 'spec_helper'
 
 RSpec.describe AlertManagement::ProcessPrometheusAlertService do
-  let_it_be(:project) { create(:project, :repository) }
+  let_it_be(:project, reload: true) { create(:project, :repository) }
 
   before do
     allow(ProjectServiceWorker).to receive(:perform_async)
@@ -128,6 +128,9 @@ RSpec.describe AlertManagement::ProcessPrometheusAlertService do
         let(:status) { 'resolved' }
         let!(:alert) { create(:alert_management_alert, project: project, fingerprint: parsed_alert.gitlab_fingerprint) }
 
+        context 'when auto_resolve_incident set to true' do
+          let_it_be(:operations_settings) { create(:project_incident_management_setting, project: project, auto_close_incident: true) }
+
           context 'when status can be changed' do
             it 'resolves an existing alert' do
               expect { execute }.to change { alert.reload.resolved? }.to(true)
@@ -179,6 +182,15 @@ RSpec.describe AlertManagement::ProcessPrometheusAlertService do
           it { is_expected.to be_success }
         end
 
+        context 'when auto_resolve_incident set to false' do
+          let_it_be(:operations_settings) { create(:project_incident_management_setting, project: project, auto_close_incident: false) }
+
+          it 'does not resolve an existing alert' do
+            expect { execute }.not_to change { alert.reload.resolved? }
+          end
+        end
+      end
+
       context 'environment given' do
         let(:environment) { create(:environment, project: project) }