code: @BetaApi
    public final AggregatedListInstancesPagedResponse aggregatedListInstances(String project) {
      AggregatedListInstancesHttpRequest request =
          AggregatedListInstancesHttpRequest.newBuilder().setProject(project).build();
      return aggregatedListInstances(request);
    }
docs: Retrieves aggregated list of all of the instances in your project across all regions and zones.
  
  <p>Sample code:
  
  <pre><code>
  try (InstanceClient instanceClient = InstanceClient.create()) {
  ProjectName project = ProjectName.of("[PROJECT]");
  for (InstancesScopedList element : instanceClient.aggregatedListInstances(project.toString()).iterateAll()) {
  // doThingsWith(element);
  }
  }
  </code></pre>
  
  @param project Project ID for this request.
  @throws com.google.api.gax.rpc.ApiException if the remote call fails