code: function filterUniqueApps() {
    const uniqueApps = new Set();
    return function uniqueAppFilter([appName]) {
      if (uniqueApps.has(appName)) {
        return false;
      }
      uniqueApps.add(appName);
      return true;
    };
  }
docs: filters only one deployment per app, so that the user doesn't see so many deployments at once. this mode can be bypassed by supplying an app name