public com.google.protobuf.ByteString getInstanceBytes() {
      java.lang.Object ref = instance_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b =
            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
        instance_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
<pre>
App instance.

By default, the task is sent to an instance which is available when
the task is attempted.

Requests can only be sent to a specific instance if
[manual scaling is used in App Engine
Standard](https://cloud.google.com/appengine/docs/python/an-overview-of-app-engine?hl=en_US#scaling_types_and_instance_classes).
App Engine Flex does not support instances. For more information, see
[App Engine Standard request
routing](https://cloud.google.com/appengine/docs/standard/python/how-requests-are-routed)
and [App Engine Flex request
routing](https://cloud.google.com/appengine/docs/flexible/python/how-requests-are-routed).
</pre>

<code>string instance = 3;</code>

@return The bytes for instance.
java-tasks/proto-google-cloud-tasks-v2/src/main/java/com/google/cloud/tasks/v2/AppEngineRouting.java