@java.lang.Override
  public java.lang.String getEventId() {
    java.lang.Object ref = eventId_;
    if (ref instanceof java.lang.String) {
      return (java.lang.String) ref;
    } else {
      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
      java.lang.String s = bs.toStringUtf8();
      eventId_ = s;
      return s;
    }
  }
<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 eventId.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/AppPlatformEventBody.java