Below you can find a time-indexed list of notable events and changes to archival policies in the Software Heritage Archive. Each of them might have (had) an impact on how content is archived and explain apparent statistical anomalies or other changes in archival behavior over time. They are collected in this document for historical reasons.
2021-11-22 Made the package loaders write release objects instead of revisions (tracking: T3638)
2021-09-22 Disabled insertion of Git objects with non-canonical representations in the SWH data model (tracking: T399)
2021-08-03 Completed first archival of SourceForge Mercurial repositories; regular crawling for those repositories enabled (tracking: T3374)
2021-07-22 Completed first archival of SourceForge Git and Subversion repositories; regular crawling for those repositories enabled (tracking: T3374)
2020-10-06 - 2020-11-23: source code crawlers have been paused to avoid an out of disk condition, due to an unexpected delay in the arrival of new storage hardware. Push archival (both deposit and save code now) remained in operation. (tracking: T2656)
2019-06-30: completed first archival of, and added to regular crawling, several GitLab instances: 0xacab.org, framagit.org, gite.lirmm.fr, gitlab.common-lisp.net, gitlab.freedesktop.org, gitlab.gnome.org, gitlab.inria.fr, salsa.debian.org