sentry/static/app/views/alerts/rules/metric/utils/isCustomMetricAlert.tsx

import {parseField, parseMRI} from 'sentry/utils/metrics/mri';

/**
 * Currently we can tell if an alert is a custom metric alert by checking the aggregate for a MRI,
 */
export function isCustomMetricAlert(aggregate: string): boolean {
  return !!parseMRI(parseField(aggregate)?.mri);
}