code: public void setExports(String mdcKeys) {
          ensureNotStarted();
          requireNonNull(mdcKeys, "mdcKeys");
          Arrays.stream(mdcKeys.split(",")).map(String::trim).forEach(this::setExport);
      }
docs: Adds the properties represented by the specified comma-separated MDC keys to the export list.
  Note: this method is meant to be used for XML configuration.
  Use {@code add*()} methods instead.