tl;dr starting today:
Use: scap sync 'message for posterity' instead of: scap 'message for posterity'
Scap 3.2.0-1 is now alive and well in production which means scap subcommands are live.
All subcommands are documented[0]. Additional documentation can be seen by running `scap --help` (or `scap [subcommand] --help`). If you have any questions feel free to ask them on-list or in IRC on #scap3 or #wikimedia-releng.
Thanks! Tyler Cipriani and the Deployment Working Group
[0]. Mediawiki: https://doc.wikimedia.org/mw-tools-scap/scap2/commands.html Scap3: https://doc.wikimedia.org/mw-tools-scap/scap3/deploy_commands.html