When a channel stops working
If Slack stops taking messages, because the app was removed or the channel was archived or deleted, Aide stops posting there, marks the channel "Reconnect needed" and tells owners and admins in the app and by email. Reconnecting the same channel keeps the events it had. Which events each channel gets is recorded in the audit log.
Who else hears about it
Emails follow the same rule as Slack: what happened, the subject, the customer's name and a link, at most one per person, conversation and type every 5 minutes. SLA warnings go to the assignee, then the team's members, then owners and admins; breaches are emailed too. Receipts and newsletters filed by sender rules notify nobody.