kennknowles opened a new issue, #18939:
URL: https://github.com/apache/beam/issues/18939

   At least for publishing (and maybe pulling) messages, non-Dataflow-based 
sources and sinks for Pub/Sub use the [public 
API](https://cloud.google.com/pubsub/docs/publisher) for Pub/Sub, which doesn't 
support id_label and timestamp_attribute settings.
   
   Publishing:
    id_label - add an attribute to each message with a unique value
    timestamp_attribute - add an attribute to each message with the publishing 
time as its value
   
   Pulling:
    id_label - use the value of this message attribute to deduplicate messages
    timestamp_attribute - use the value of this message attribute as the 
element's timestamp
   
    
   
   Implementation details: could probably create a pubsubio.py module, for 
reuse with other runners (i.e. implement Pub/Sub IO as PTransforms and not 
NativeSinks and Sources).
   
   Imported from Jira 
[BEAM-4275](https://issues.apache.org/jira/browse/BEAM-4275). Original Jira may 
contain additional context.
   Reported by: udim.


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