@Nullable
  private static String buildDimensionKey(@Nullable final String initialDimensionKey) {
    if (initialDimensionKey == null) return null;
    return ExperimentalUI.isNewUI() ? initialDimensionKey + EXPERIMENTAL_UI_DIMENSION_KEY_SUFFIX : initialDimensionKey;
  }
@Nullable
  private static String buildDimensionKey(@Nullable final String initialDimensionKey)