public static com.google.cloud.visionai.v1.Application.ApplicationRuntimeInfo
              .GlobalOutputResource
          parseFrom(com.google.protobuf.CodedInputStream input) throws java.io.IOException {
        return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
      }
<pre>
The key of the output resource, it has to be unique within the same
producer node. One producer node can output several output resources,
the key can be used to match corresponding output resources.
</pre>

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

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