Context
we use Open Source version (v0.48.3) and according to pricing page they should be able to setup Email Alerts to their team's Slack Channel email. See screenshot.
Issue
Unfortunately, today Users can only setup alerts for themselves and can no longer send alerts to other emails. In the screenshot you can see that Users do not have the option for Slack alerts
It has nothing to do with open source or priced version.Only admins can define Slack channel for Alerts, since it's not possible to know which channels the users should be able to see or not.