Synapse 1.40.0 (2021-08-10)

No significant changes.

Synapse 1.40.0rc3 (2021-08-09)

Fix the PeriodicallyFlushingMemoryHandler inhibiting application shutdown because of its background thread. (#10517)
Fix a bug introduced in Synapse v1.40.0rc1 that could cause Synapse to respond with an error when clients would update read receipts. (#10531)

Add support for MSC2033: device_id on /account/whoami. (#9918)
Update support for MSC2716 - Incrementally importing history into existing rooms. (#10245, #10432, #10463)
Update support for MSC3083 to consider changes in the MSC around which servers can issue join events. (#10254, #10447, #10489)
Initial support for MSC3244, Room version capabilities over the /capabilities API. (#10283)
Add a buffered logging handler which periodically flushes itself. (#10407, #10515)
Add support for https connections to a proxy server. Contributed by @Bubu and @dklimpel. (#10411)
Support for MSC2285 (hidden read receipts). Contributed by @SimonBrandner. (#10413)
Email notifications now state whether an invitation is to a room or a space. (#10426)
Allow setting transaction limit for database connections. (#10440, #10511)
Add creation_ts to "list users" admin API. (#10448)

Improve character set detection in URL previews by supporting underscores (in addition to hyphens). Contributed by @srividyut. (#10410)
Fix events being incorrectly rejected over federation if they reference auth events that the server needed to fetch. (#10439)
Fix synapse_federation_server_oldest_inbound_pdu_in_staging Prometheus metric to not report a max age of 51 years when the queue is empty. (#10455)
Fix a bug which caused an explicit assignment of power-level 0 to a user to be misinterpreted in rare circumstances. (#10499)

Fix hierarchy of providers on the OpenID page. (#10445)
Consolidate development documentation to docs/development/. (#10453)
Add some developer docs to explain room DAG concepts like outliers, state_groups, depth, etc. (#10464)
Document how to use Complement while developing a new Synapse feature. (#10483)

Prune inbound federation queues for a room if they get too large. (#10390)
Add type hints to synapse.federation.transport.client module. (#10408)
Remove shebang line from module files. (#10415)
Drop backwards-compatibility code that was required to support Ubuntu Xenial. (#10429)
Use a docker image cache for the prerequisites for the debian package build. (#10431)
Improve servlet type hints. (#10437, #10438)
Replace usage of or_ignore in simple_insert with simple_upsert usage, to stop spamming postgres logs with spurious ERROR messages. (#10442)
Update the tests-done Github Actions status. (#10444, #10512)
Update type annotations to work with forthcoming Twisted 21.7.0 release. (#10446, #10450)
Cancel redundant GHA workflows when a new commit is pushed. (#10451)
Mitigate media repo XSS attacks on IE11 via the non-standard X-Content-Security-Policy header. (#10468)
Additional type hints in the state handler. (#10482)
Update syntax used to run complement tests. (#10488)
Fix up type annotations to work with Twisted 21.7. (#10490)
Improve type annotations for ObservableDeferred. (#10491)
Extend release script to also tag and create GitHub releases. (#10496)
Fix a bug which caused production debian packages to be incorrectly marked as 'prerelease'. (#10500)