This requires:
- the swh.vault v0.6
- some changes in the default configuration [1] so the vault benefits from using objstorage
and graph[2] services.
First staging then production if everything is ok.
[1] P1077
[2] The graph service is not ready for prime time, it needs some packaging and internal reworking regarding the existing swh.graph.client module (possibly to be moved to swh.web.client)