[4.6.3]
Update etherpad-lite to 2.7.3
Full Changelog
Pad compaction. New compactPad HTTP API plus bin/compactPad and bin/compactAllPads CLIs to reclaim database space on long-lived pads with heavy edit history (issue #6194). --keep N retains the last N revisions; --dry-run previews per-pad rev counts before writing. Per-pad failures don't stop the bulk run.
Social / mobile metadata. Pad, timeslider, and home views now emit Open Graph and Twitter Card tags (closes #7599) and a theme-color meta that matches the toolbar on mobile.
Socket.io: don't kick authenticated duplicate-author sessions. A regression where two tabs from the same authenticated author could evict each other has been fixed (#7656 / #7678).
Anchor scrolling. Anchor-link navigation now waits for layout to settle, so jumping to a deep link no longer overshoots.
Plugin updater. bin/updatePlugins.sh actually updates installed plugins again (closes #6670).
Settings: stable per-release version string. randomVersionString is now derived from the release identity rather than regenerated on each boot, so caches behave correctly across restarts of the same version.