doc/radosgw: add "persistent_topic_size"

Add "persistent_topic_size" to the list of "Notification Performance
Statistics" in doc/radosgw/notifications.rst.

Fixes: https://tracker.ceph.com/issues/71792
Signed-off-by: Zac Dover <zac.dover@proton.me>
(cherry picked from commit 5f96ade1734d1ab7053b792a1df4e316e31691a5)

diff --git a/doc/radosgw/notifications.rst b/doc/radosgw/notifications.rst
index c780409f078f55c15eced2084c74b09a62069fea..89111904950bf9d38b2105b895a7fb34703fdcc2 100644 (file)
--- a/doc/radosgw/notifications.rst
+++ b/doc/radosgw/notifications.rst
@@ -125,6 +125,7 @@ Dump (in JSON format) all pending bucket notifications of a persistent topic by
 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