Synapse 1.43.0 released

Synapse 1.43.0 is out now!

Preparing for Spaces

Quite a lot of work has gone into preparing for Spaces to graduate from beta testing. For example, Synapse now:

• Asks clients to prefer room version 9 when creating restricted rooms (#10772), via the API defined in MSC3244: room version capabilities.
• Allows the Spaces Summary APIs to be handled by worker processes.
• Omits rooms with unknown room versions from the Spaces Summary.
• Properly handles upgrades of Spaces to different room versions.

Everything Else

This release of Synapse also:

• Includes initial work toward fully supporting oEmbed for embedding URL previews (#10714, #10759).
• Slightly speeds up room joins over federation (#10754, #10755, #10756, #10780, #10784).
• Somewhat improves service restart times for large Synapse deployments.
• Significantly refactors federation event authentication code for greater clarity (#10744, #10745, #10746, #10771, #10773, #10781).
• Adds further static type hints to various modules.

We've also spent quite a lot of time on SyTest, our integration test suite. In particular, many of the tests made assumptions about event processing which were not correct when targeting a multi-worker Synapse deployment. These flakey tests have plagued our continuous integration pipelines, and are finally being fixed.

These are just the highlights; please see the Release Notes for a complete list of changes in this release.

Synapse is a Free and Open Source Software project, and we'd like to extend our thanks to everyone who contributed to this release, including AndrewFerr, BramvdnHeuvel, and cuttingedge1109.