Synapse 1.91.0 (2023-08-30)

No significant changes since 1.91.0rc1.

Synapse 1.91.0rc1 (2023-08-23)

Implements an admin API to lock an user without deactivating them. Based on MSC3939. (#15870)
Implements a task scheduler for resumable potentially long running tasks. (#15891)
Allow specifying client_secret_path as alternative to client_secret for OIDC providers. This avoids leaking the client secret in the homeserver config. Contributed by @Ma27. (#16030)
Allow customising the IdP display name, icon, and brand for SAML and CAS providers (in addition to OIDC provider). (#16094)
Add an admins query parameter to the List Accounts admin API, to include only admins or to exclude admins in user queries. (#16114)

Fix long-standing bug where concurrent requests to change a user's push rules could cause a deadlock. Contributed by Nick @ Beeper (@Fizzadar). (#16052)
Fix a long-standing bug in /sync where timeout=0 does not skip caching, resulting in slow calls in cases where there are no new changes. Contributed by @PlasmaIntec. (#16080)
Fix performance of state resolutions for large, old rooms that did not have the full auth chain persisted. (#16116)
Filter out user agent references to the sliding sync proxy and rust-sdk from the user_daily_visits table to ensure that Element X can be represented fully. (#16124)
User constent and 3-PID changes capability cannot be enabled when using experimental MSC3861 support. (#16127, #16134)
Fix a rare race that could block new events from being sent for up to two minutes. Introduced in v1.90.0. (#16133, #16169)
Fix performance degredation when there are a lot of in-flight replication requests. (#16148)
Fix a bug introduced in 1.87 where synapse would send an excessive amount of federation requests to servers which have been offline for a long time. Contributed by Nico. (#16156, #16164)

Update dehydrated devices implementation. (#16010)
Fix database performance of read/write worker locks. (#16061)
Fix building the nix development environment on MacOS systems. (#16063)
Override global statement timeout when creating indexes in Postgres. (#16085)
Fix the type annotation on run_db_interaction in the Module API. (#16089)
Clean-up the presence code. (#16092)
Run pyupgrade for Python 3.8+. (#16110)
Rename pagination and purge locks and add comments to explain why they exist and how they work. (#16112)
Attempt to fix the twisted trunk job. (#16115)
Cache token introspection response from OIDC provider. (#16117)
Add cache to get_server_keys_json_for_remote. (#16123)
Add an admin endpoint to allow authorizing server to signal token revocations. (#16125)
Add response time metrics for introspection requests for delegated auth. (#16131)
MSC3861: allow impersonation by an admin user using _oidc_admin_impersonate_user_id query parameter. (#16132)
Increase performance of read/write locks. (#16149)
Improve presence tests. (#16150, #16151, #16158)
Raised the poetry-core version cap to 1.7.0. (#16152)
Fix assertion in user directory unit tests. (#16157)
Reduce scope of locks when paginating to alleviate DB contention. (#16159)
Reduce DB contention on worker locks. (#16160)
Task scheduler: mark task as active if we are scheduling as soon as possible. (#16165)