docs: public static void printHelp(PrintStream stream) throws IOException {
              stream.println();
              stream.println("NAME");
              stream.println("  meta get - Get metadata from nodes");
              stream.println();
              stream.println("SYNOPSIS");
              stream.println("  meta get (<meta-key-list> | all) -u <url> [-d <output-dir>]");
              stream.println("           [-n <node-id-list> | --all-nodes] [--verbose]");
              stream.println();
              stream.println("COMMENTS");
              stream.println("  Valid meta keys are:");
              for(Object key: MetadataStore.METADATA_KEYS) {
                  stream.println("    " + (String) key);
              }
              stream.println();
              getParser().printHelpOn(stream);
              stream.println();
          }