@Override
  public InternalDistributedMember getSender() {
    return sender;
  }
Returns a InternalDistributedMember instance representing a member that is sending (or has
sent) this alert. Could be <code>null</code>.

@return the InternalDistributedMember instance representing a member that is sending/has sent
        this alert

@since GemFire 6.5
geode-core/src/main/java/org/apache/geode/internal/admin/remote/RemoteAlert.java