feat(pubsub): add opencensus metrics for outstanding messages/bytes #3690
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This PR adds two more views that reports the number of outstanding messages/bytes that are held by the flow controller. The aim is to allow deeper insight into the number of inflight messages that have been acquired by the client but not yet processed. In addition, this also starts tracking outstanding bytes (
bytesRemaining
) inflow_controller.go
This feature is experimental and subject to change.
/cc @lahuang4