Summary

When Slack notification are enabled on a specific space in a Confluence Cloud instance, users are getting notified with below message across all the pages/spaces the instance level.

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Confluence Cloud [APP]
Looks like you've just shared a Confluence Cloud link. To display previews of pages and blog posts from https://hostname.atlassian.net, link your Confluence Cloud site to your Slack account.
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Steps to reproduce

1. Connect a Slack channel to a Confluence Space
2. Enable the notifications on that particular space.
3. Paste a page link from any other Space in Slack channel
4. User will see below alert in Confluence Cloud app in Slack.
   

Expected behavior

Slack shouldn't send notifications / recommendation for the pages/spaces which are not configured Slack notifications.

Current behavior

Slack is sending notification to connect at the instance level to link Confluence Cloud site for all the pages.

Workaround

There is no workaround at the moment instead of disabling the integration at site level.

Recommendation

It'll be good to make notifications configurable at the individual user level to make this app more palatable for users who do not want to receive such prompts.