private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.tasks.v2beta3.QueueStats,
            com.google.cloud.tasks.v2beta3.QueueStats.Builder,
            com.google.cloud.tasks.v2beta3.QueueStatsOrBuilder>
        getStatsFieldBuilder() {
      if (statsBuilder_ == null) {
        statsBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.tasks.v2beta3.QueueStats,
                com.google.cloud.tasks.v2beta3.QueueStats.Builder,
                com.google.cloud.tasks.v2beta3.QueueStatsOrBuilder>(
                getStats(), getParentForChildren(), isClean());
        stats_ = null;
      }
      return statsBuilder_;
    }
<pre>
Output only. The realtime, informational statistics for a queue. In order
to receive the statistics the caller should include this field in the
FieldMask.
</pre>

<code>
.google.cloud.tasks.v2beta3.QueueStats stats = 12 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-tasks/proto-google-cloud-tasks-v2beta3/src/main/java/com/google/cloud/tasks/v2beta3/Queue.java