@Override
  public StatisticDescriptor createDoubleCounter(String name,
      String description,
      String units) {
    return statisticsManager.createDoubleCounter(name, description, units);
  }
Checks whether or not this connection to a distributed system is closed.

@throws DistributedSystemDisconnectedException This connection has been
        {@link #disconnect(boolean, String, boolean) disconnected}
geode-core/src/main/java/org/apache/geode/distributed/internal/InternalDistributedSystem.java