message: Query Browser: Improve style of metrics dropdown error state
  If the metrics list fails to load, disable the dropdown and add an error
  icon to the message.
diff: @@ -24,6 +24,7 @@ import * as React from 'react';
  import { Helmet } from 'react-helmet';
  import { connect } from 'react-redux';
  +import { RedExclamationCircleIcon } from '@console/shared';
  import * as UIActions from '../../actions/ui';
  import { connectToURLs, MonitoringRoutes } from '../../reducers/monitoring';
  import { fuzzyCaseInsensitive } from '../factory/table-filters';
  @@ -137,13 +138,14 @@ const MetricsDropdown = ({onChange, onLoad}) => {
  let title: React.ReactNode = 'Insert Metric at Cursor';
  if (isError) {
  - title = 'Failed to load metrics list';
  + title = <span><RedExclamationCircleIcon /> Failed to load metrics list.</span>;
  } else if (_.isEmpty(items)) {
  title = <LoadingInline />;
  }
  return <Dropdown
  autocompleteFilter={fuzzyCaseInsensitive}
  + disabled={isError}
  id="metrics-dropdown"
  items={items}
  menuClassName="query-browser__metrics-dropdown-menu query-browser__metrics-dropdown-menu--insert"
  