How to check replication stream queue or rate of streaming

Hi folks,
Is there a way of checking the replication stream queue, and the rate that it is sending the data from one database to the other? Is there a log file that I could look at to see that streaming is happening?
Currently I am checking that streaming is happening by checking the sizes of both databases, to verify that this is changing. However, this is not accurate, since some of the data changes are modifies rather than additions / deletions.
When I do 'repadmin -status', the queue sizes is 0. Is this a known Oracle issue?:
QUEUE SIZES
Capture Queue Size: 0
Apply Queue Size: 0
Appreciate any suggestions you have.
Thank you.

You can query the V$ views to get stats regarding the rate of streaming
V$STREAMS_CAPTURE -> Rate of enqueue
V$STREAMS_APPLY_READER -> Rate of dequeue

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