Nguyễn Việt Đức created JAMES-3062:
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             Summary: DeadLetter: size gauge
                 Key: JAMES-3062
                 URL: https://issues.apache.org/jira/browse/JAMES-3062
             Project: James Server
          Issue Type: Improvement
            Reporter: Nguyễn Việt Đức


*Why* This allows a grafana board on EventBus fatal errors

The admin would thus know he needs to go and analyse/reprocess/clean dead 
letter.

Modify dead-letter with a "Publisher failedEventCount()" method - and write 
unit tests for it.

Implement it with a counter for "Cassandra Event dead letter".

DOD: Test gauge size as part of deadLetter contract, all implementation should 
publish it. Add a grafana board for this.



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