@java.lang.Override
  public int getSerializedSize() {
    int size = memoizedSize;
    if (size != -1) return size;

    size = 0;
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(stream_)) {
      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, stream_);
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(event_)) {
      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, event_);
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(series_)) {
      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, series_);
    }
    if (((bitField0_ & 0x00000001) != 0)) {
      size += com.google.protobuf.CodedOutputStream.computeMessageSize(4, getUpdateTime());
    }
    if (offset_ != 0L) {
      size += com.google.protobuf.CodedOutputStream.computeInt64Size(5, offset_);
    }
    size += getUnknownFields().getSerializedSize();
    memoizedSize = size;
    return size;
  }
<pre>
The offset of the message that will be used to acknowledge of the message
receiving.
</pre>

<code>int64 offset = 5;</code>

@return The offset.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/EventUpdate.java