public Builder clearEventMessage() {
      eventMessage_ = getDefaultInstance().getEventMessage();
      bitField0_ = (bitField0_ & ~0x00000001);
      onChanged();
      return this;
    }
<pre>
Human readable string of the event like "There are more than 6 people in
the scene". or "Shelf is empty!".
</pre>

<code>string event_message = 1;</code>

@return This builder for chaining.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/AppPlatformEventBody.java