code: private static void appendMetaColumns(StringBuilder buffer, MetadataColumnDefinition[] values) {
          for (MetadataColumnDefinition column : values) {
              buffer.append(", ").append(column.getColumnNamePrefix());
          }
      }
docs: Append metric and entity metadata columns to series requests. This method must not be used while processing meta tables.
  @param buffer StringBuilder to append to
  @param values columns to append