gitlab.com will start pruning inactive repositories in september 2022: https://www.theregister.com/2022/08/04/gitlab_data_retention_policy/ (thx to pabs3 on #swh for bringing it up)
according to https://grafana.softwareheritage.org/d/6q7qtNSnk/draft-scheduler-metrics?orgId=1&from=1657007647537&to=1659599647538 , we currently have 4M archived repositories from gitlab.com, but 60k of them are outdated; and we are missing 220k more.
Therefore, I believe we should prioritize archival of Gitlab.com so that all repositories are visited within 12 months of their last update (including creation).