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https://issues.apache.org/jira/browse/JAMES-3297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17151961#comment-17151961
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Benoit Tellier commented on JAMES-3297:
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JamesMailSpooler currently have a *AtomicInteger processingActive* that is
exposed over JMX. Would that fit you needs?
In such case we just need to replace the AtomicInteger with a metric and we are
good.
> Publish the number of items currently in the mailet pipeline as a metric
> ------------------------------------------------------------------------
>
> Key: JAMES-3297
> URL: https://issues.apache.org/jira/browse/JAMES-3297
> Project: James Server
> Issue Type: Improvement
> Reporter: Matthieu Baechler
> Priority: Major
>
> Some MailQueue implementations have a limit on the number of elements that
> can be dequeued but not yet ack (RabbitMQ has that feature).
> In some cases it can prevent new mails to being dequeued and it's not easy to
> diagnose.
> By exposing that number as a metric and/or issuing a warning when this number
> reach the limit, we could help the operator to understand what's going wrong.
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