code: @Implementation(minSdk = Build.VERSION_CODES.P)
    @HiddenApi
    public @StandbyBuckets int getAppStandbyBucket(String packageName) {
      Integer bucket = appStandbyBuckets.get(packageName);
      return (bucket == null) ? UsageStatsManager.STANDBY_BUCKET_ACTIVE : bucket;
    }
docs: Returns the current standby bucket of the specified app that is set by {@code
  setAppStandbyBucket}. If the standby bucket value has never been set, return {@link
  UsageStatsManager.STANDBY_BUCKET_ACTIVE}.