We want to change the published URL in email alerts to a different name (C-Name) since we are going to migrate web serving off our primary poller, and start publishing the URL externally for support staff who receive alerts to their phones.
Currently it looks like this:

We need to replace the server name "SXNETSW1" with the C-Name.
Where do I change that name to make the alert variable use it instead of the server name?