docs: public CmsFlexCacheKey getCachedKey(String key, CmsObject cms) {
  
          if (!isEnabled() || !OpenCms.getRoleManager().hasRole(cms, CmsRole.WORKPLACE_MANAGER)) {
              return null;
          }
          Object o = m_keyCache.get(key);
          if (o != null) {
              return ((CmsFlexCacheVariation)o).m_key;
          }
          return null;
      }