Hi, I'm trying to use [PubsubIO]( https://beam.apache.org/documentation/sdks/javadoc/2.1.0/org/apache/beam/sdk/io/gcp/pubsub/PubsubIO.html) to read [PubsubMessage]( https://beam.apache.org/documentation/sdks/javadoc/2.1.0/org/apache/beam/sdk/io/gcp/pubsub/PubsubMessage.html ).
I've noticed that the PubsubMessage class in Beam only exposes Attribute and Payload but the [PubSubMessage in Google Cloud]( http://googleapis.github.io/googleapis/java/proto-google-cloud-pubsub-v1/0.1.19/apidocs/com/google/pubsub/v1/PubsubMessage.html?is-external=true) exposes a lot more information like `getPublishTime()`. Is there a way for us to get the same amount information in Beam easily? -- Derek Hao Hu Software Engineer | Snapchat Snap Inc.
