For the first request to ListTrafficPolicyInstances, omit this value.
If the value of IsTruncated in the previous response was true, you have more traffic policy instances. To get the next group of MaxItems traffic policy instances, submit another ListTrafficPolicyInstances request. For the value of HostedZoneIdMarker, specify the value of HostedZoneIdMarker from the previous response, which is the hosted zone ID of the first traffic policy instance in the next group of MaxItems traffic policy instances.
If the value of IsTruncated in the previous response was false, there are no more traffic policy instances to get.