In Make if you try to delete a connection with webhooks that depend on it you will get the error below. This means that one or more webhooks were created via the module and need to be deleted. The issue is that Make does not indicate which webhooks are linked to that connection and there is no way of finding that out using the Make platform.

How to identify the webhooks and scenarios affected then?

The best is to use Make API. The endpoint that retrieves the hooks returns the connection ID. So it is possible with a simple scenario to generate a list of scenarios or webhooks affected.

The only tricky part is the connection ID has a field name that is not very self-explanatory: __IMTCONN__