Usually one would use web_cgi_url for notification that end users can click on the URL to view the record detail page. However, if for some reason(like web_cgi_url is load balance one but this record notification is internal using one of the Service Desk servers) you don't want to use web_cgi_url, what you could do? This article uses call request workflow task notification as an example and shows how one can construct a new URL link without using web_cgi_url.
CA Service Desk 17.3 and higher
Service Desk admin can modify the existing notification message template or create a new and insert this URL
http://server.example.com/CAisd/pdmweb.exe?OP=SEARCH+FACTORY=cr_wf+SKIPLIST=1+QBE.EQ.id=@{id}
This example is for call request workflow task notification. Others should be similar.