Add the %DEVICE-GROUP% field to your alert emails where you want them to display.
This involves editing the alert email message text files (In your PathSolutions folder) and adding that field where you want it:
You need to add specifically %DEVICE-GROUP% to the file.
It can be added wherever you want it to display. For example, if you wanted it to be included in the Subject line of the email, add it there:
Subject: %DEVICE-AGENT% in %DEVICE-GROUP% group had %ALERTSTRING%
Example: Subject: %DEVICE-AGENT% on %DEVICE-GROUP% is NOT responding to requests
%PRODNAME% reports device %DEVICE-AGENT% (%DEVICE-NAME%) on %DEVICE-GROUP% is NOT responding to requests.