Atlassian Data Center edition will continue to be supported. It is the same software as the Server offering but with a different product key unlocking some more

Atlassian Data Center edition will continue to be supported. It is the same software as the Server offering but with a different product key unlocking some more features like multiple nodes. It is far more expensive than Server, but still cheaper than Atlassian Cloud. And I found the per-user pricing to be about on par with alternative products from other suppliers. But for small companies, the brittleness of the licence count tiers can really inflate the cost.