...
The S/Notify for Jira and Confluence Server apps will continue to be available as long as Atlassian continues to sell server apps. We are also Server customers who stay on Server will be able to continue purchasing S/Notify apps until February 2, 2023 PT from the Atlassian Marketplace. Renewals are expected to be prorated with an end date of February 2, 2024 PT to match your server products' end of support date.
We are evaluating options to provide licenses and maintenance options after Atlassian has stopped selling these over the Atlassian Marketplacethese dates, so to enable you to continue using our apps.
S/Notify for Jira and Confluence Data Center
...