This same kind of question was posted previously to our site in https://community.atlassian.com/t5/Answers-Developer-Questions/how-to-get-the-jira-server-info/qaq-p/573364 While the details of that reply were for Jira 6 versions, I think the updated way to find this can be found on
There is a getServerId() method you can call there in order to find this information. Note that these documents are for the JAVA API. I don't believe the REST API in Jira actually has this ability.
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