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looks like it is a lambda function that listens to a SNS topic that receives events from CW. i'm not sure there is something out of the box, there might be but it should be straight forward to implement yourself.

This isn't usually configured by Pulumi, since there is no Slack provider (yet) and this sort of thing is usually handled via a Slack app (e.g. marbot). You could use an incident/alert management app (we use Opsgenie) to achieve the same thing. Some of those have Pulumi providers...