[jira] [Commented] (JAMES-3297) Publish the number of items currently in the mailet pipeline as a metric

["Benoit Tellier (Jira)" <se...@james.apache.org>]

    [ https://issues.apache.org/jira/browse/JAMES-3297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17151961#comment-17151961 ] 

Benoit Tellier commented on JAMES-3297:
---------------------------------------

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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