chore(deps): update ghcr.io/element-hq/synapse docker tag to v1.146.0

[renovate]

This PR contains the following updates:

Package	Update	Change
ghcr.io/element-hq/synapse	minor	v1.145.0 → v1.146.0

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Release Notes

element-hq/synapse (ghcr.io/element-hq/synapse)

v1.146.0

Compare Source

Synapse 1.146.0 (2026-01-27)

No significant changes since 1.146.0rc1.

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.

Synapse 1.146.0rc1 (2026-01-20)

Features

• 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)

Bugfixes

• 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)

Updates to the Docker image

• 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)

Improved Documentation

• 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)

Internal Changes

• 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)

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