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

    size = 0;
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(eventMessage_)) {
      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, eventMessage_);
    }
    if (((bitField0_ & 0x00000001) != 0)) {
      size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getPayload());
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(eventId_)) {
      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, eventId_);
    }
    size += getUnknownFields().getSerializedSize();
    memoizedSize = size;
    return size;
  }
<pre>
User defined Event Id, used to classify event, within a delivery interval,
events from the same application instance with the same id will be
de-duplicated &amp; only first one will be sent out. Empty event_id will be
treated as "".
</pre>

<code>string event_id = 3;</code>

@return The bytes for eventId.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/AppPlatformEventBody.java