Thank you for reaching out.
Unfortunately, it is not possible to configure a notification to be sent when a JIRA release is complete at the moment, at least not with the Official JIRA and Slack integration.
That being said, we agree this would be a useful feature so we created the following feature request to get it implemented:
Feel free to vote and watch the suggestion to increase its priority and also receive notifications about any updates.
Additionally, feel free to check in the Atlassian marketplace for any apps that would accomplish your needs.
Let me know if you have any questions.
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