code: function getIcon(datum) {
    if (!datum.alert) return {};
    if (datum.alert.improvement) {
      return {
        icon: 'cp:thumb-up',
        iconColor: 'var(--improvement-color, green)',
      };
    }
    return {
      icon: 'cp:error',
      iconColor: datum.alert.bugId ?
        'var(--neutral-color-dark, grey)' : 'var(--error-color, red)',
    };
  }
docs: Improvement alerts display thumbs-up icons. Regression alerts display error icons.