Customizing notification template for comments in merge requests

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I don't know if it's at all possible to customise notification templates in general, but if it is possible, I'd like to add some information to the notifications I receive when someone comments a merge request.

The purpose is to save (a lot of) time.

This is our workflow for the developer:

• Someone creates a merge request
• He adds a comment mentioning a user group (not in the MR description, as notifications to groups/mentions aren't sent from there, for some reasons)
• All the mentioned people (or the people in the group) receive a notification

The workflow for the reviewer:

• He must take any unmerged MR where he's mentioned, which is not already assigned to someone else, and which didn't get at least two thumb ups
• Do his review, add comments if needed, and wait for a reply
• If/when everything is good, add a thumb up, unassign himself, and write a short approval comment (because thumb ups does not send any notification)

The problem with the email notification is that I must open the MR to see if the MR has any assignee and to see how many thumb ups it got.

Therefore, if we could add this information (how?) to the notification email, it would save a lot of time, since we get many of them per day.