code: public final ListInstanceConfigsPagedResponse listInstanceConfigs(String parent) {
      ListInstanceConfigsRequest request =
          ListInstanceConfigsRequest.newBuilder().setParent(parent).build();
      return listInstanceConfigs(request);
    }
docs: Lists the supported instance configurations for a given project.
  
  <p>Sample code:
  
  <pre><code>
  try (InstanceAdminClient instanceAdminClient = InstanceAdminClient.create()) {
  ProjectName parent = ProjectName.of("[PROJECT]");
  for (InstanceConfig element : instanceAdminClient.listInstanceConfigs(parent.toString()).iterateAll()) {
  // doThingsWith(element);
  }
  }
  </code></pre>
  
  @param parent Required. The name of the project for which a list of supported instance
  configurations is requested. Values are of the form `projects/&lt;project&gt;`.
  @throws com.google.api.gax.rpc.ApiException if the remote call fails