grafana/public/app/features/alerting/unified/components/NoAlertManagerWarning.tsx

import { Alert } from '@grafana/ui';

import { AlertManagerDataSource } from '../utils/datasource';

interface Props {
  availableAlertManagers: AlertManagerDataSource[];
}

const NoAlertManagersAvailable = () => (
  <Alert title="No Alertmanager found" severity="warning">
    We could not find any external Alertmanagers and you may not have access to the built-in Grafana Alertmanager.
  </Alert>
);

const OtherAlertManagersAvailable = () => (
  <Alert title="Selected Alertmanager not found." severity="warning">
    The selected Alertmanager no longer exists or you may not have permission to access it. You can select a different
    Alertmanager from the dropdown.
  </Alert>
);

export const NoAlertManagerWarning = ({ availableAlertManagers }: Props) => {
  const hasOtherAMs = availableAlertManagers.length > 0;

  return <div>{hasOtherAMs ? <OtherAlertManagersAvailable /> : <NoAlertManagersAvailable />}</div>;
};