code: public void signalReady() {
          Map<String, String> hostTags = this.ec2Context.getInstanceTags();
          this.signalReady(hostTags.get(TAG_CLOUDFORMATION_STACK_NAME), hostTags.get(TAG_CLOUDFORMATION_LOGICAL_ID));
      }
docs: signal success to the current CloudFormation stack.<br>
  The resource is derived from the instance tags
  <br>
  Needed AWS actions:
  <ul>
  <li>ec2:DescribeInstances</li>
  <li>cloudformation:SignalResource</li>
  </ul>