public Builder clearLastAttempt() {
      bitField0_ = (bitField0_ & ~0x00000400);
      lastAttempt_ = null;
      if (lastAttemptBuilder_ != null) {
        lastAttemptBuilder_.dispose();
        lastAttemptBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
Output only. The status of the task's last attempt.
</pre>

<code>.google.cloud.tasks.v2beta3.Attempt last_attempt = 9;</code>
java-tasks/proto-google-cloud-tasks-v2beta3/src/main/java/com/google/cloud/tasks/v2beta3/Task.java