@java.lang.Override
  public Builder newBuilderForType() {
    return newBuilder();
  }
<pre>
The task's tag.

Tags allow similar tasks to be processed in a batch. If you label
tasks with a tag, your worker can
[lease tasks][google.cloud.tasks.v2beta2.CloudTasks.LeaseTasks] with the
same tag using
[filter][google.cloud.tasks.v2beta2.LeaseTasksRequest.filter]. For example,
if you want to aggregate the events associated with a specific user once a
day, you could tag tasks with the user ID.

The task's tag can only be set when the
[task is created][google.cloud.tasks.v2beta2.CloudTasks.CreateTask].

The tag must be less than 500 characters.

SDK compatibility: Although the SDK allows tags to be either
string or
[bytes](https://cloud.google.com/appengine/docs/standard/java/javadoc/com/google/appengine/api/taskqueue/TaskOptions.html#tag-byte:A-),
only UTF-8 encoded tags can be used in Cloud Tasks. If a tag isn't UTF-8
encoded, the tag will be empty when the task is returned by Cloud Tasks.
</pre>

<code>string tag = 2;</code>

@return The bytes for tag.
java-tasks/proto-google-cloud-tasks-v2beta2/src/main/java/com/google/cloud/tasks/v2beta2/PullMessage.java