The alerts functionality in Gemini has changed to batch notifications (except for watchers / followers). We now use the navigation cards to subscibe to alerts. Have you seen the alerts shipped with Geemini?

Is the template syntax Razor or something else?

Unfortunately only the Data Model Values for Breeze Notifications have been documented. Are the other alert types documented somewhere else? At least Breeze Notifications do not seem to have the same level of detail as the old notifications had.

People use e-mail notifications to quickly judqe whether they need to go to Gemini to look into an issue more thoroughly. This might be difficult to achieve through AppNav Cards, unless they go to Gemini first.

What would you like the alert to include?

Basically everything that was on the old notifications. It should show a quick capture of all the changes that have been made to each issue (status/progress changes, reallocated resources, latest comments, etc.).

Changes made cannot be shown at the moment. That will come in December. You can show current values like:

@Model.TheItem.Status
@Model.TheItem.ResourceNames