AWS CloudWatch Logs Publisher plugin hangs on job completion
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It looks like that it is not a reported issue. Also combined with your remark, i.e.:


  It always completes successfully, even with the delay.


I wonder whether it is really an issue as I have seen a lot of logs and also weird messages while everything worked. What I do in such situation is talk with the developer of the code. In this case I would create an issue in the Jenkins bug tracker and discuss whether this is an issue and whether the developers should change the code that triggers this message.