Andre Klapper created an issue:
https://gitlab.gnome.org/GNOME/grappe/-/commits/master shows three commits in total, in June and July 2017, and no further activity.
@poirigui: What is the status of this project? Is there any further active development, or should this project realistically be archived? Asking as you are the sole maintainer and developer.
https://wiki.gnome.org/Apps/Grappe and https://gitlab.gnome.org/GNOME/grappe/-/blob/master/grappe.doap state that this is A remote and local job management system for GNOME.