code: private static void buildSampleRowKeysSettings(Builder builder, BigtableOptions options) {
      RetrySettings retrySettings =
          buildIdempotentRetrySettings(builder.sampleRowKeysSettings().getRetrySettings(), options);
  
      builder.sampleRowKeysSettings()
          .setRetrySettings(retrySettings)
          .setRetryableCodes(buildRetryCodes(options.getRetryOptions()));
    }
docs: To build BigtableDataSettings#sampleRowKeysSettings with default Retry settings.