Synapse 1.146.0rc1 (2026-01-20)

Deprecations and Removals

MSC2697 (Dehydrated devices) has been removed, as the MSC is closed. Developers should migrate to MSC3814. (#19346)
Support for Ubuntu 25.04 (Plucky Puffin) has been dropped. Synapse no longer builds debian packages for Ubuntu 25.04.

Add a new config option enable_local_media_storage which controls whether media is additionally stored locally when using configured media_storage_providers. Setting this to false allows off-site media storage without a local cache. Contributed by Patrice Brend'amour @dr.allgood. (#19204)
Stabilise support for MSC4312's m.oauth User-Interactive Auth stage for resetting cross-signing identity with the OAuth 2.0 API. The old, unstable name (org.matrix.cross_signing_reset) is now deprecated and will be removed in a future release. (#19273)
Refactor Grafana dashboard to use server_name label (instead of instance). (#19337)

Fix joining a restricted v12 room locally when no local room creator is present but local users with sufficient power levels are. Contributed by @nexy7574. (#19321)
Fixed parallel calls to /_matrix/media/v1/create being ratelimited for appservices even if rate_limited: false was set in the registration. Contributed by @tulir @ Beeper. (#19335)
Fix a bug introduced in 1.61.0 where a user's membership in a room was accidentally ignored when considering access to historical state events in rooms with the "shared" history visibility. Contributed by Lukas Tautz. (#19353)
MSC4140: Store the JSON content of scheduled delayed events as text instead of a byte array. This fixes the inability to schedule a delayed event with non-ASCII characters in its content. (#19360)
Always rollback database transactions when retrying (avoid orphaned connections). (#19372)
Fix InFlightGauge typing to allow upgrading to prometheus_client 0.24. (#19379)

Add Prometheus HTTP service discovery endpoint for easy discovery of all workers when using the docker/Dockerfile-workers image (see the Metrics section of our Docker testing docs). (#19336)

Remove docs on legacy metric names (no longer in the codebase since 2022-12-06). (#19341)
Clarify how the estimated value of room complexity is calculated internally. (#19384)

Add an internal cancel_task API to the task scheduler. (#19310)
Tweak docstrings and signatures of auth_types_for_event and get_catchup_room_event_ids. (#19320)
Replace usage of deprecated assertEquals with assertEqual in unit test code. (#19345)
Drop support for Ubuntu 25.04 'Plucky Puffin', add support for Ubuntu 25.10 'Questing Quokka'. (#19348)
Revert "Add an Admin API endpoint for listing quarantined media (#19268)". (#19351)
Bump mdbook from 0.4.17 to 0.5.2 and remove our custom table-of-contents plugin in favour of the new default functionality. (#19356)
Replace deprecated usage of PyGitHub's GitRelease.title with .name in release script. (#19358)
Update the Element logo in Synapse's README to be an absolute URL, allowing it to render on other sites (such as PyPI). (#19368)
Apply minor tweaks to v1.145.0 changelog. (#19376)
Update Grafana dashboard syntax to use the latest from importing/exporting with Grafana 12.3.1. (#19381)
Warn about skipping reactor metrics when using unknown reactor type. (#19383)
Add support for reactor metrics with the ProxiedReactor used in worker Complement tests. (#19385)