public Builder mergeLastUpdateTime(com.google.protobuf.Timestamp value) {
        if (lastUpdateTimeBuilder_ == null) {
          if (((bitField0_ & 0x00000002) != 0)
              && lastUpdateTime_ != null
              && lastUpdateTime_ != com.google.protobuf.Timestamp.getDefaultInstance()) {
            getLastUpdateTimeBuilder().mergeFrom(value);
          } else {
            lastUpdateTime_ = value;
          }
        } else {
          lastUpdateTimeBuilder_.mergeFrom(value);
        }
        if (lastUpdateTime_ != null) {
          bitField0_ |= 0x00000002;
          onChanged();
        }
        return this;
      }
<pre>
Output only. The time at which the status was last updated.
</pre>

<code>
.google.protobuf.Timestamp last_update_time = 2 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/DeployedModel.java