Output only. Output Only The resource type, which is alwayscompute#instanceGroupsListInstances for the list of instances
in the specified instance group.
Output only. Output Only This token allows you to get the next page of results for
list requests. If the number of results is larger thanmaxResults, use the nextPageToken as a value for
the query parameter pageToken in the next list request.
Subsequent list requests will have their own nextPageToken to
continue paging through the results.