get _clumpTitles() {
    return {
      warning: Globals.strings.warningAuditsGroupTitle,
      manual: Globals.strings.manualAuditsGroupTitle,
      passed: Globals.strings.passedAuditsGroupTitle,
      notApplicable: Globals.strings.notApplicableAuditsGroupTitle,
    };
  }
Display info per top-level clump. Define on class to avoid race with Util init.