[v11.1.x] Alerting: Make context deadline on AlertNG service startup configurable (#96132)

Alerting: Make context deadline on AlertNG service startup configurable (#96053)

* Make alerting context deadline configurable

* Remove debug logs

* Change default timeout

* Update tests

(cherry picked from commit 1fdc48faba)

pkg/services/ngalert/ngalert.go

@@ -151,7 +151,7 @@ type AlertNG struct {
 
 func (ng *AlertNG) init() error {
 	// AlertNG should be initialized before the cancellation deadline of initCtx
-	initCtx, cancelFunc := context.WithTimeout(context.Background(), 30*time.Second)
+	initCtx, cancelFunc := context.WithTimeout(context.Background(), ng.Cfg.UnifiedAlerting.InitializationTimeout)
 	defer cancelFunc()
 
 	ng.store.Logger = ng.Log

pkg/services/ngalert/tests/util.go

@@ -45,7 +45,8 @@ func SetupTestEnv(tb testing.TB, baseInterval time.Duration) (*ngalert.AlertNG,
 
 	cfg := setting.NewCfg()
 	cfg.UnifiedAlerting = setting.UnifiedAlertingSettings{
-		BaseInterval: setting.SchedulerBaseInterval,
+		BaseInterval:          setting.SchedulerBaseInterval,
+		InitializationTimeout: 30 * time.Second,
 	}
 	// AlertNG database migrations run and the relative database tables are created only when it's enabled
 	cfg.UnifiedAlerting.Enabled = new(bool)

pkg/services/quota/quotaimpl/quota_test.go

@@ -496,6 +496,7 @@ func setupEnv(t *testing.T, sqlStore db.DB, cfg *setting.Cfg, b bus.Bus, quotaSe
 	ac := acimpl.ProvideAccessControl(featuremgmt.WithFeatures())
 	ruleStore, err := ngstore.ProvideDBStore(cfg, featuremgmt.WithFeatures(), sqlStore, &foldertest.FakeService{}, &dashboards.FakeDashboardService{}, ac)
 	require.NoError(t, err)
+	cfg.UnifiedAlerting.InitializationTimeout = 30 * time.Second
 	_, err = ngalert.ProvideService(
 		cfg, featuremgmt.WithFeatures(), nil, nil, routing.NewRouteRegister(), sqlStore, ngalertfakes.NewFakeKVStore(t), nil, nil, quotaService,
 		secretsService, nil, m, &foldertest.FakeService{}, &acmock.Mock{}, &dashboards.FakeDashboardService{}, nil, b, &acmock.Mock{},