docs: public VoltTable[] run(SystemProcedureExecutionContext ctx) {
          // Choose the lowest site ID on this host to actually flip the bit
          VoltDBInterface voltdb = VoltDB.instance();
          OperationMode opMode = voltdb.getMode();
  
          if (ctx.isLowestSiteId()) {
              ZooKeeper zk = voltdb.getHostMessenger().getZK();
              try {
                  Stat stat;
                  OperationMode zkMode = null;
                  Code code;
                  do {
                      stat = new Stat();
                      code = Code.BADVERSION;
                      try {
                          byte [] data = zk.getData(VoltZK.operationMode, false, stat);
                          zkMode = data == null ? opMode : OperationMode.valueOf(data);
                          if (zkMode == RUNNING) {
                              break;
                          }
                          stat = zk.setData(VoltZK.operationMode, RUNNING.getBytes(), stat.getVersion());
                          code = Code.OK;
                          zkMode = RUNNING;
                          break;
                      } catch (BadVersionException ex) {
                          code = ex.code();
                      }
                  } while (zkMode != RUNNING && code == Code.BADVERSION);
  
                  m_stat = stat;
                  voltdb.getHostMessenger().unpause();
                  voltdb.setMode(RUNNING);
                  // for snmp
                  SnmpTrapSender snmp = voltdb.getSnmpTrapSender();
                  if (snmp != null) {
                      snmp.resume("Cluster resumed.");
                  }
              } catch (Exception e) {
                  throw new RuntimeException(e);
              }
          }
  
          VoltTable t = new VoltTable(VoltSystemProcedure.STATUS_SCHEMA);
          t.addRow(VoltSystemProcedure.STATUS_OK);
          return new VoltTable[] {t};
      }