@java.lang.Override
    public java.lang.String getProducerNode() {
      java.lang.Object ref = producerNode_;
      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();
        producerNode_ = s;
        return s;
      }
    }
<pre>
The name of graph node who produces the output resource name.
For example:
output_resource:
/projects/123/locations/us-central1/clusters/456/streams/output-application-789-stream-a-occupancy-counting
producer_node: occupancy-counting
</pre>

<code>string producer_node = 2;</code>

@return The producerNode.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/Instance.java