I received an email with the Title ^ as the subject. Says it all. I'm not directly using the specified endpoint (storage@v1). The project in question is a postback catcher that funnels data into BigQuery
App Engine > Pub Sub > Dataflow > Cloud Storage > BigQuery
Related question here indicates Dataflow might be indirectly using it. I'm only using the Cloud PubSub to GCS Text template.
What is the recommended course of action if I'm relying on a template?
I think the warning may come from a dataflow job which uses the old version of storage API. Please upgrade Dataflow/Beam SDK version beyond 2.5.
Since you're using our PubsubToText template. The easiest way to to it would be:
After that you should not see any more warnings.