Using server addon v5.9.14, we have a webhook to notify of page updates in a Confluence space to a specific channel, which works fine.
Some users prefer to create restricted pages within the space whilst they draft them, and then unrestrict (and share) them once complete.
Unfortunately, the plugin posts announcements to Slack even for pages with restricted access in Confluence, which causes users to click on the link and then complain that they don't have access to the page. It makes a simple workflow preference seem like something shady :)
I would recommend adding an option (or, arguably, default behaviour) that if the restrictions on a page are set to "Viewing Restrictions", then the Slack notification is suppressed.