Open the bot's Home tab, choose Set up customer channels, and pick the shared channels to watch (the bot pre-selects the Slack Connect channels it is already in). Set a response target, tag the people or on-call group to alert, and pick an internal channel like #customer-alerts for the alerts.
A message from someone at the customer's company starts the clock, in the channel or in a thread. A quick "thanks!" doesn't. A reply, a thread answer or a reaction from anyone on your team stops it. Bots and edits don't count. When the target passes, your team gets one alert with View, Snooze and Dismiss, and one escalation later if it is still open. Your customers never see any of it.

Want to see what an alert looks like? Open the Home tab and click Send me a test alert.