private com.google.protobuf.SingleFieldBuilderV3<
            com.google.protobuf.Timestamp,
            com.google.protobuf.Timestamp.Builder,
            com.google.protobuf.TimestampOrBuilder>
        getResponseTimeFieldBuilder() {
      if (responseTimeBuilder_ == null) {
        responseTimeBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.protobuf.Timestamp,
                com.google.protobuf.Timestamp.Builder,
                com.google.protobuf.TimestampOrBuilder>(
                getResponseTime(), getParentForChildren(), isClean());
        responseTime_ = null;
      }
      return responseTimeBuilder_;
    }
<pre>
Output only. The time that this attempt response was received.

`response_time` will be truncated to the nearest microsecond.
</pre>

<code>.google.protobuf.Timestamp response_time = 3;</code>
java-tasks/proto-google-cloud-tasks-v2/src/main/java/com/google/cloud/tasks/v2/Attempt.java