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Stabilize MSC3266, support stable room_summary endpoint - #19720

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Stabilize MSC3266, support stable room_summary endpoint#19720
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@dasha-uwu dasha-uwu commented Apr 23, 2026 •
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MSC3266 is merged in v1.15, let's stabilize it as part of #18731

  1. Add support for the stable /_matrix/client/v1/room_summary/ endpoint, keeping both unstable endpoints for compat
  2. Remove the experimental msc3266_enabled flag

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@dasha-uwu
dasha-uwu requested a review from a team as a code owner April 23, 2026 11:48
erikjohnston
erikjohnston approved these changes Apr 24, 2026
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Thanks!

@erikjohnston
erikjohnston merged commit 7fc937b into element-hq:develop Apr 24, 2026
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MadLittleMods
MadLittleMods reviewed Apr 24, 2026
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Comment thread changelog.d/19720.feature
@@ -0,0 +1 @@
Stabilize MSC3266, removing the experimental config flag `msc3266_enabled`. Add support for stable room summary endpoints. Contributed by @dasha-uwu.

@MadLittleMods MadLittleMods Apr 24, 2026 •
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@erikjohnston Please check off #18731 as necessary to what this PR solves (include links to this PR on the points it solves)

@MadLittleMods MadLittleMods May 12, 2026 •
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Looks like this might have been done today (looking at the edit history on #18731)

(although the PR wasn't linked anywhere in the issue)

@benbz benbz mentioned this pull request May 13, 2026
Merged
FrenchGithubUser pushed a commit to famedly/synapse-upstreaming that referenced this pull request Jun 12, 2026
@dasha-uwu @FrenchGithubUser
Stabilize MSC3266, support stable room_summary endpoint (element-hq#1…
8863058 
…9720)

MSC3266 is merged in v1.15, let's stabilize it as part of element-hq#18731

1. Add support for the stable `/_matrix/client/v1/room_summary/`
endpoint, keeping both unstable endpoints for compat
2. Remove the experimental `msc3266_enabled` flag
netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request Jul 7, 2026
gdt
chat/matrix-synapse: Update to 1.156.0
b8812c8 
Tested on NetBSD 10 amd64 with 2026Q2 environment.

# Synapse 1.156.0 (2026-07-07)

## Features

- Expose [MSC4354 Sticky Events](matrix-org/matrix-spec-proposals#4354) over [MSC4186 (Simplified) Sliding Sync](matrix-org/matrix-spec-proposals#4186). ([\#19591](element-hq/synapse#19591))
- Stabilize support for sending ephemeral events to application services, as per [MSC2409](matrix-org/matrix-spec-proposals#2409). Contributed by @jason-famedly @ Famedly. ([\#19758](element-hq/synapse#19758))
- Include `allowed_room_ids` in the `/summary` client-server API response for rooms with restricted join rules, as required by Matrix 1.15.
  Contributed by @FrenchGithubUser @famedly. ([\#19762](element-hq/synapse#19762))
- [MSC4140: Cancellable delayed events](matrix-org/matrix-spec-proposals#4140): Allow authentication on delayed event management endpoints (such as `/restart`) to bypass ratelimits for unauthenticated requests based on the client IP address. ([\#19794](element-hq/synapse#19794))
- Add new metric `synapse_non_deactivated_user_count` which tracks the number of non-deactivated users in the database, split by `app_service`. ([\#19848](element-hq/synapse#19848))
- The `GET /_matrix/client/unstable/org.matrix.msc1763/retention/configuration` endpoint is now provided when retention
  is enabled and `experimental_features.msc1763_enabled` is enabled, based on
  [MSC1763](matrix-org/matrix-spec-proposals#1763). ([\#19853](element-hq/synapse#19853))
- Add experimental support for [MSC4491: Invite reasons in room creation](matrix-org/matrix-spec-proposals#4491). ([\#19874](element-hq/synapse#19874))


# Synapse 1.155.0 (2026-06-16)


# Synapse 1.154.0 (2026-06-04)

## Features

- Add support for [MSC4452: Preview URL capabilities API](matrix-org/matrix-spec-proposals#4452) which exposes a `io.element.msc4452.preview_url` capability.
  If `experimental_features.msc4452_enabled` is `true`, the `/_matrix/(client/v1/media|media/v3)/preview_url` endpoint
  now responds with a 403 status code when the capability is disabled. ([\#19715](element-hq/synapse#19715))


# Synapse 1.153.0 (2026-05-19)

## Features

- Make ACLs apply to EDUs per [MSC4163](matrix-org/matrix-spec-proposals#4163). ([\#18475](element-hq/synapse#18475))
- Stabilize [MSC3266: Room summary API](matrix-org/matrix-spec-proposals#3266), removing the experimental config flag `msc3266_enabled`. Contributed by @dasha-uwu. ([\#19720](element-hq/synapse#19720))
- Partial [MSC4311](matrix-org/matrix-spec-proposals#4311) implementation: `m.room.create` is now a required part of stripped `invite_state`/`knock_state` . Contributed by @FrenchGithubUser @famedly. ([\#19722](element-hq/synapse#19722))
- Expose `tombstoned` and `replacement_room` in room details on admin API endpoint `GET /_synapse/admin/v1/rooms/<room_id>`. Contributed by Noah Markert. ([\#19737](element-hq/synapse#19737))


# Synapse 1.152.1 (2026-05-07)


# Synapse 1.152.0 (2026-04-28)

## Features

- Add a ["Listing quarantined media changes" Admin API](https://element-hq.github.io/synapse/latest/admin_api/media_admin_api.html#listing-quarantined-media-changes) for retrieving a paginated record of when media became (un)quarantined. ([\#19558](element-hq/synapse#19558), [\#19677](element-hq/synapse#19677), [\#19694](element-hq/synapse#19694))
- Advertise [MSC4445](matrix-org/matrix-spec-proposals#4445) sync timeline order in `unstable_features`. ([\#19642](element-hq/synapse#19642))
- Report the Rust compiler version used in the Prometheus metrics. Contributed by Noah Markert. ([\#19643](element-hq/synapse#19643))
- Passthrough 'article' and 'profile' OpenGraph metadata on URL preview requests. ([\#19659](element-hq/synapse#19659))
- Add a way to re-sign local events with a new signing key. ([\#19668](element-hq/synapse#19668))
- Support [MSC4450: Identity Provider selection for User-Interactive Authentication with Legacy Single Sign-On](matrix-org/matrix-spec-proposals#4450). ([\#19693](element-hq/synapse#19693))
- Add experimental support for [MSC4242](matrix-org/matrix-spec-proposals#4242): State DAGs. Excludes federation support. ([\#19424](element-hq/synapse#19424))
- Adds [Admin API](https://element-hq.github.io/synapse/latest/usage/administration/admin_api/index.html) endpoints to
  list, fetch and delete user reports. ([\#19657](element-hq/synapse#19657))
- Reduce database disk space usage by pruning old rows from `device_lists_changes_in_room`. ([\#19473](element-hq/synapse#19473), [\#19709](element-hq/synapse#19709))


# Synapse 1.151.0 (2026-04-07)

## Features

- Add stable support for [MSC4284](matrix-org/matrix-spec-proposals#4284) Policy Servers. ([\#19503](element-hq/synapse#19503))
- Update and stabilize support for [MSC2666](matrix-org/matrix-spec-proposals#2666): Get rooms in common with another user. Contributed by @tulir @ Beeper. ([\#19511](element-hq/synapse#19511))
- Updated experimental support for [MSC4388: Secure out-of-band channel for sign in with QR](matrix-org/matrix-spec-proposals#4388). ([\#19573](element-hq/synapse#19573))
- Stabilize `room_version` and `encryption` fields in the space/room `/hierarchy` API (part of [MSC3266](matrix-org/matrix-spec-proposals#3266)). ([\#19576](element-hq/synapse#19576))
- Introduce a [configuration option](https://element-hq.github.io/synapse/latest/usage/configuration/config_documentation.html#matrix_authentication_service) to allow using HTTP/2 over plaintext when Synapse connects to Matrix Authentication Service. ([\#19586](element-hq/synapse#19586))

## Deprecations and Removals

- Remove support for [MSC3852: Expose user agent information on Device](matrix-org/matrix-spec-proposals#3852) as the MSC was closed. ([\#19430](element-hq/synapse#19430))


# Synapse 1.150.0 (2026-03-24)

## Features

- Add experimental support for the [MSC4370](matrix-org/matrix-spec-proposals#4370) Federation API `GET /extremities` endpoint. ([\#19314](element-hq/synapse#19314))
- [MSC4140: Cancellable delayed events](matrix-org/matrix-spec-proposals#4140): When persisting a delayed event to the timeline, include its `delay_id` in the event's `unsigned` section in `/sync` responses to the event sender. ([\#19479](element-hq/synapse#19479))
- Expose [MSC4354 Sticky Events](matrix-org/matrix-spec-proposals#4354) over the legacy (v3) /sync API. ([\#19487](element-hq/synapse#19487))
- When Matrix Authentication Service (MAS) integration is enabled, allow MAS to set the user locked status in Synapse. ([\#19554](element-hq/synapse#19554))
@barodeur barodeur mentioned this pull request Sep 29, 2026
Closed
34 tasks done
tsutsui pushed a commit to tsutsui/pkgsrc that referenced this pull request Oct 17, 2026
gdt
chat/matrix-synapse: Update to 1.156.0
1706994 
Tested on NetBSD 10 amd64 with 2026Q2 environment.

# Synapse 1.156.0 (2026-07-07)

## Features

- Expose [MSC4354 Sticky Events](matrix-org/matrix-spec-proposals#4354) over [MSC4186 (Simplified) Sliding Sync](matrix-org/matrix-spec-proposals#4186). ([\#19591](element-hq/synapse#19591))
- Stabilize support for sending ephemeral events to application services, as per [MSC2409](matrix-org/matrix-spec-proposals#2409). Contributed by @jason-famedly @ Famedly. ([\#19758](element-hq/synapse#19758))
- Include `allowed_room_ids` in the `/summary` client-server API response for rooms with restricted join rules, as required by Matrix 1.15.
  Contributed by @FrenchGithubUser @famedly. ([\#19762](element-hq/synapse#19762))
- [MSC4140: Cancellable delayed events](matrix-org/matrix-spec-proposals#4140): Allow authentication on delayed event management endpoints (such as `/restart`) to bypass ratelimits for unauthenticated requests based on the client IP address. ([\#19794](element-hq/synapse#19794))
- Add new metric `synapse_non_deactivated_user_count` which tracks the number of non-deactivated users in the database, split by `app_service`. ([\#19848](element-hq/synapse#19848))
- The `GET /_matrix/client/unstable/org.matrix.msc1763/retention/configuration` endpoint is now provided when retention
  is enabled and `experimental_features.msc1763_enabled` is enabled, based on
  [MSC1763](matrix-org/matrix-spec-proposals#1763). ([\#19853](element-hq/synapse#19853))
- Add experimental support for [MSC4491: Invite reasons in room creation](matrix-org/matrix-spec-proposals#4491). ([\#19874](element-hq/synapse#19874))


# Synapse 1.155.0 (2026-06-16)


# Synapse 1.154.0 (2026-06-04)

## Features

- Add support for [MSC4452: Preview URL capabilities API](matrix-org/matrix-spec-proposals#4452) which exposes a `io.element.msc4452.preview_url` capability.
  If `experimental_features.msc4452_enabled` is `true`, the `/_matrix/(client/v1/media|media/v3)/preview_url` endpoint
  now responds with a 403 status code when the capability is disabled. ([\#19715](element-hq/synapse#19715))


# Synapse 1.153.0 (2026-05-19)

## Features

- Make ACLs apply to EDUs per [MSC4163](matrix-org/matrix-spec-proposals#4163). ([\#18475](element-hq/synapse#18475))
- Stabilize [MSC3266: Room summary API](matrix-org/matrix-spec-proposals#3266), removing the experimental config flag `msc3266_enabled`. Contributed by @dasha-uwu. ([\#19720](element-hq/synapse#19720))
- Partial [MSC4311](matrix-org/matrix-spec-proposals#4311) implementation: `m.room.create` is now a required part of stripped `invite_state`/`knock_state` . Contributed by @FrenchGithubUser @famedly. ([\#19722](element-hq/synapse#19722))
- Expose `tombstoned` and `replacement_room` in room details on admin API endpoint `GET /_synapse/admin/v1/rooms/<room_id>`. Contributed by Noah Markert. ([\#19737](element-hq/synapse#19737))


# Synapse 1.152.1 (2026-05-07)


# Synapse 1.152.0 (2026-04-28)

## Features

- Add a ["Listing quarantined media changes" Admin API](https://element-hq.github.io/synapse/latest/admin_api/media_admin_api.html#listing-quarantined-media-changes) for retrieving a paginated record of when media became (un)quarantined. ([\#19558](element-hq/synapse#19558), [\#19677](element-hq/synapse#19677), [\#19694](element-hq/synapse#19694))
- Advertise [MSC4445](matrix-org/matrix-spec-proposals#4445) sync timeline order in `unstable_features`. ([\#19642](element-hq/synapse#19642))
- Report the Rust compiler version used in the Prometheus metrics. Contributed by Noah Markert. ([\#19643](element-hq/synapse#19643))
- Passthrough 'article' and 'profile' OpenGraph metadata on URL preview requests. ([\#19659](element-hq/synapse#19659))
- Add a way to re-sign local events with a new signing key. ([\#19668](element-hq/synapse#19668))
- Support [MSC4450: Identity Provider selection for User-Interactive Authentication with Legacy Single Sign-On](matrix-org/matrix-spec-proposals#4450). ([\#19693](element-hq/synapse#19693))
- Add experimental support for [MSC4242](matrix-org/matrix-spec-proposals#4242): State DAGs. Excludes federation support. ([\#19424](element-hq/synapse#19424))
- Adds [Admin API](https://element-hq.github.io/synapse/latest/usage/administration/admin_api/index.html) endpoints to
  list, fetch and delete user reports. ([\#19657](element-hq/synapse#19657))
- Reduce database disk space usage by pruning old rows from `device_lists_changes_in_room`. ([\#19473](element-hq/synapse#19473), [\#19709](element-hq/synapse#19709))


# Synapse 1.151.0 (2026-04-07)

## Features

- Add stable support for [MSC4284](matrix-org/matrix-spec-proposals#4284) Policy Servers. ([\#19503](element-hq/synapse#19503))
- Update and stabilize support for [MSC2666](matrix-org/matrix-spec-proposals#2666): Get rooms in common with another user. Contributed by @tulir @ Beeper. ([\#19511](element-hq/synapse#19511))
- Updated experimental support for [MSC4388: Secure out-of-band channel for sign in with QR](matrix-org/matrix-spec-proposals#4388). ([\#19573](element-hq/synapse#19573))
- Stabilize `room_version` and `encryption` fields in the space/room `/hierarchy` API (part of [MSC3266](matrix-org/matrix-spec-proposals#3266)). ([\#19576](element-hq/synapse#19576))
- Introduce a [configuration option](https://element-hq.github.io/synapse/latest/usage/configuration/config_documentation.html#matrix_authentication_service) to allow using HTTP/2 over plaintext when Synapse connects to Matrix Authentication Service. ([\#19586](element-hq/synapse#19586))

## Deprecations and Removals

- Remove support for [MSC3852: Expose user agent information on Device](matrix-org/matrix-spec-proposals#3852) as the MSC was closed. ([\#19430](element-hq/synapse#19430))


# Synapse 1.150.0 (2026-03-24)

## Features

- Add experimental support for the [MSC4370](matrix-org/matrix-spec-proposals#4370) Federation API `GET /extremities` endpoint. ([\#19314](element-hq/synapse#19314))
- [MSC4140: Cancellable delayed events](matrix-org/matrix-spec-proposals#4140): When persisting a delayed event to the timeline, include its `delay_id` in the event's `unsigned` section in `/sync` responses to the event sender. ([\#19479](element-hq/synapse#19479))
- Expose [MSC4354 Sticky Events](matrix-org/matrix-spec-proposals#4354) over the legacy (v3) /sync API. ([\#19487](element-hq/synapse#19487))
- When Matrix Authentication Service (MAS) integration is enabled, allow MAS to set the user locked status in Synapse. ([\#19554](element-hq/synapse#19554))
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