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After hitting Add, it will be listed, the JEMH loggging will now be interwoven with the JIRA_HOME/log/atlassian-jira.log file.
Noisy Environments
If your JIRA is quite busy, and you have other plugins that are contributing to the logfile, it can be difficult to see the JEMH-specific logging. In this situation, a custom logfile needs to be created, please see Installation, Setup and Logging (this route requires a JIRA restart, so you'll need to schedule accordingly).