Navigate to the Clustering option in System Settings, you have data center setup, you will information of nodes, otherwise, you will have info on how to set up a data center.
The other option is if System Info in System Settings, (Path - /secure/admin/ViewSystemInfo.jspa) you have "Installation Type"
Alternatively, navigate to https://my.atlassian.com/product to see license details if the license you have is of server or data center.
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