Merge pull request #64139 from zdover23/wip-doc-2025-06-25-backport-64106-to-squid

squid: doc/radosgw: add "persistent_topic_size"

Reviewed-by: Anthony D'Atri <anthony.datri@gmail.com>

diff --cc doc/radosgw/notifications.rst
index 047443f4d5b0c33832d84ad85ba2a6504424bae8,89111904950bf9d38b2105b895a7fb34703fdcc2..c0781266384144a4e7f54079ecb8cc9629456a5d
--- 1/doc/radosgw/notifications.rst
--- 2/doc/radosgw/notifications.rst
+++ b/doc/radosgw/notifications.rst
@@@ -125,7 -125,9 +125,8 @@@ Dump (in JSON format) all pending bucke
  Notification Performance Statistics
  -----------------------------------
  
+ - ``persistent_topic_size``: queue size in bytes. 
  - ``pubsub_event_triggered``: a running counter of events that have at least one topic associated with them
 -- ``pubsub_event_lost``: a running counter of events that had topics associated with them, but that were not pushed to any of the endpoints
  - ``pubsub_push_ok``: a running counter, for all notifications, of events successfully pushed to their endpoints
  - ``pubsub_push_fail``: a running counter, for all notifications, of events that failed to be pushed to their endpoints
  - ``pubsub_push_pending``: the gauge value of events pushed to an endpoint but not acked or nacked yet