- Use `rel=canonical` link to de-duplicate event permalinks, https://github.com/matrix-org/matrix-viewer/pull/266, https://github.com/matrix-org/matrix-viewer/pull/269
- Prevent join event spam with stable `reason`, https://github.com/matrix-org/matrix-viewer/pull/268
- Don't allow previewing `shared` history rooms, https://github.com/matrix-org/matrix-viewer/pull/239
- Initial public release with good enough functionality to be generally available including: room directory homepage, room archive view with calendar jump-to-date, drill-down with the time selector, following room upgrades (tombstone/predecessor), and more. Completed milestone: https://github.com/matrix-org/matrix-viewer/milestone/1