public Builder mergeResponseTime(com.google.protobuf.Timestamp value) {
      if (responseTimeBuilder_ == null) {
        if (((bitField0_ & 0x00000004) != 0)
            && responseTime_ != null
            && responseTime_ != com.google.protobuf.Timestamp.getDefaultInstance()) {
          getResponseTimeBuilder().mergeFrom(value);
        } else {
          responseTime_ = value;
        }
      } else {
        responseTimeBuilder_.mergeFrom(value);
      }
      if (responseTime_ != null) {
        bitField0_ |= 0x00000004;
        onChanged();
      }
      return this;
    }
<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