fix(alerts): custom metric flag check (#71991)

static/app/views/alerts/rules/metric/utils/getMetricDatasetQueryExtras.tsx

@@ -1,6 +1,7 @@
 import type {Location} from 'history';
 
 import type {Organization} from 'sentry/types/organization';
+import {hasCustomMetrics} from 'sentry/utils/metrics/features';
 import {hasOnDemandMetricAlertFeature} from 'sentry/utils/onDemandMetrics/features';
 import {decodeScalar} from 'sentry/utils/queryString';
 import {getMEPAlertsDataset} from 'sentry/views/alerts/wizard/options';
@@ -22,6 +23,7 @@ export function getMetricDatasetQueryExtras({
 }) {
   const hasMetricDataset =
     hasOnDemandMetricAlertFeature(organization) ||
+    hasCustomMetrics(organization) ||
     organization.features.includes('mep-rollout-flag');
   const disableMetricDataset =
     decodeScalar(location?.query?.disableMetricDataset) === 'true';