Synapse 1.52.0rc1 (2022-02-01)

Features

Remove account data (including client config, push rules and ignored users) upon user deactivation. (#11621, #11788, #11789)
Add an admin API to reset connection timeouts for remote server. (#11639)
Add an admin API to get a list of rooms that federate with a given remote homeserver. (#11658)
Add a config flag to inhibit M_USER_IN_USE during registration. (#11743)
Add a module callback to set username at registration. (#11790)
Allow configuring a maximum file size as well as a list of allowed content types for avatars. (#11846)

Include the bundled aggregations in the /sync response, per MSC2675. (#11612)
Fix a long-standing bug when previewing Reddit URLs which do not contain an image. (#11767)
Fix a long-standing bug that media streams could cause long-lived connections when generating URL previews. (#11784)
Include a prev_content field in state events sent to Application Services. Contributed by @totallynotvaishnav. (#11798)
Fix a bug introduced in Synapse 0.33.3 causing requests to sometimes log strings such as HTTPStatus.OK instead of integer status codes. (#11827)

Update pypi installation docs to indicate that we now support Python 3.10. (#11820)
Add missing steps to the contribution submission process in the documentation. Contributed by @sequentialread. (#11821)
Remove not needed old table of contents in documentation. (#11860)
Consolidate the access_token information at the top of each relevant page in the Admin API documentation. (#11861)

Drop support for Python 3.6, which is EOL. (#11683)
Remove the experimental_msc1849_support_enabled flag as the features are now stable. (#11843)

Preparation for database schema simplifications: add state_key and rejection_reason columns to events table. (#11792)
Add FrozenEvent.get_state_key and use it in a couple of places. (#11793)
Preparation for database schema simplifications: stop reading from event_reference_hashes. (#11794)
Drop unused table public_room_list_stream. (#11795)
Preparation for reducing Postgres serialization errors: allow setting transaction isolation level. Contributed by Nick @ Beeper. (#11799, #11847)
Docker: skip the initial amd64-only build and go straight to multiarch. (#11810)
Run Complement on the Github Actions VM and not inside a Docker container. (#11811)
Log module names at startup. (#11813)
Improve type safety of bundled aggregations code. (#11815)
Correct a type annotation in the event validation logic. (#11817, #11830)
Minor updates and documentation for database schema delta files. (#11823)
Workaround a type annotation problem in prometheus_client 0.13.0. (#11834)
Minor performance improvement in room state lookup. (#11836)
Fix some indentation inconsistencies in the sample config. (#11838)
Add type hints to tests/rest/admin. (#11851)