asafm commented on code in PR #20859:
URL: https://github.com/apache/pulsar/pull/20859#discussion_r1273781722


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pip/pip-285.md:
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@@ -0,0 +1,73 @@
+# Background knowledge
+Existing monitoring items in Pulsar, such as "pulsar_subscription_back_log" 
and "pulsar_subscription_back_log_no_delayed," provide valuable insights into 
the quantity of backlogged messages. However, they lack a metric that directly 
measures the duration of message backlog. Monitoring the duration of backlog is 
vital as it allows us to understand the persistence of message accumulation 
within a subscription over time.

Review Comment:
   Not, this is not the meaning of backlog age. See my comments



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