StreamingPull has a 100% error rate

If you see in your metrics dashboard that the method google.pubsub.vl.Subscriber.StreamingPull is failing with 100% errors, you can safely ignore the issue. This is expected behavior. It is related to how hybrid internally configures a Google Cloud Pub/Sub API to operate with the synchronizer. See also StreamingPull has a 100% error rate (this is to be expected).