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Always communicate device OTK counts to clients #10485

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merged 6 commits into from
Jul 27, 2021

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Fixes #10484.

As far as I can tell from the spec, signed_curve25519 is the only key algorithm employed for one-time keys at the moment. Thus this PR will by default return {"signed_curve25519": 0} for key counts. Only if there are any keys available will this count be something other than 0.

This affects both /sync responses, as well as the response to POST /_matrix/client/r0/keys/upload requests.

This isn't a complete solution to the problem (hence the included TODO) as we now over-communicates to the client rather than omit the information if there have been no changes. However, that's wasting a few bytes, whereas before this code could cause encryption issues.

@anoadragon453 anoadragon453 changed the base branch from develop to release-v1.39 July 27, 2021 10:41
@anoadragon453 anoadragon453 force-pushed the anoa/explicit_device_key_counts branch from ea6b8e4 to 97144bf Compare July 27, 2021 10:42
@anoadragon453 anoadragon453 requested a review from a team July 27, 2021 10:44
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@babolivier babolivier left a comment

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lgtm otherwise

changelog.d/10485.bugfix Outdated Show resolved Hide resolved
Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
synapse/handlers/sync.py Outdated Show resolved Hide resolved
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The unit tests needed to be updated in order to expect signed_curve25519 in each response (though this is a little bit meh feeling).

Complement is expected to fail restricted room tests as we're based on the release-v1.39 branch.

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lgtm

@anoadragon453 anoadragon453 changed the title Specify known device key algorithms as constants Always communicate device OTK counts to clients Jul 27, 2021
@anoadragon453 anoadragon453 merged commit 74d09a4 into release-v1.39 Jul 27, 2021
@anoadragon453 anoadragon453 deleted the anoa/explicit_device_key_counts branch July 27, 2021 13:36
erikjohnston added a commit that referenced this pull request Jul 28, 2021
Synapse 1.39.0rc3 (2021-07-28)
==============================

Bugfixes
--------

- Fix a bug introduced in Synapse 1.38 which caused an exception at startup when SAML authentication was enabled. ([\#10477](#10477))
- Fix a long-standing bug where Synapse would not inform clients that a device had exhausted its one-time-key pool, potentially causing problems decrypting events. ([\#10485](#10485))
- Fix reporting old R30 stats as R30v2 stats. Introduced in v1.39.0rc1. ([\#10486](#10486))

Internal Changes
----------------

- Fix an error which prevented the Github Actions workflow to build the docker images from running. ([\#10461](#10461))
- Fix release script to correctly version debian changelog when doing RCs. ([\#10465](#10465))
erikjohnston added a commit that referenced this pull request Jul 29, 2021
Synapse 1.39.0rc3 (2021-07-28)
==============================

Bugfixes
--------

- Fix a bug introduced in Synapse 1.38 which caused an exception at startup when SAML authentication was enabled. ([\#10477](#10477))
- Fix a long-standing bug where Synapse would not inform clients that a device had exhausted its one-time-key pool, potentially causing problems decrypting events. ([\#10485](#10485))
- Fix reporting old R30 stats as R30v2 stats. Introduced in v1.39.0rc1. ([\#10486](#10486))

Internal Changes
----------------

- Fix an error which prevented the Github Actions workflow to build the docker images from running. ([\#10461](#10461))
- Fix release script to correctly version debian changelog when doing RCs. ([\#10465](#10465))
erikjohnston added a commit that referenced this pull request Jul 29, 2021
Synapse 1.39.0 (2021-07-29)
===========================

No significant changes.

Synapse 1.39.0rc3 (2021-07-28)
==============================

Bugfixes
--------

- Fix a bug introduced in Synapse 1.38 which caused an exception at startup when SAML authentication was enabled. ([\#10477](#10477))
- Fix a long-standing bug where Synapse would not inform clients that a device had exhausted its one-time-key pool, potentially causing problems decrypting events. ([\#10485](#10485))
- Fix reporting old R30 stats as R30v2 stats. Introduced in v1.39.0rc1. ([\#10486](#10486))

Internal Changes
----------------

- Fix an error which prevented the Github Actions workflow to build the docker images from running. ([\#10461](#10461))
- Fix release script to correctly version debian changelog when doing RCs. ([\#10465](#10465))

Synapse 1.39.0rc2 (2021-07-22)
==============================

This release also includes the changes in v1.38.1.

Internal Changes
----------------

- Move docker image build to Github Actions. ([\#10416](#10416))

Synapse 1.39.0rc1 (2021-07-20)
==============================

The Third-Party Event Rules module interface has been deprecated in favour of the generic module interface introduced in Synapse v1.37.0. Support for the old interface is planned to be removed in September 2021. See the [upgrade notes](https://matrix-org.github.io/synapse/latest/upgrade.html#upgrading-to-v1390) for more information.

Features
--------

- Add the ability to override the account validity feature with a module. ([\#9884](#9884))
- The spaces summary API now returns any joinable rooms, not only rooms which are world-readable. ([\#10298](#10298), [\#10305](#10305))
- Add a new version of the R30 phone-home metric, which removes a false impression of retention given by the old R30 metric. ([\#10332](#10332), [\#10427](#10427))
- Allow providing credentials to `http_proxy`. ([\#10360](#10360))

Bugfixes
--------

- Fix error while dropping locks on shutdown. Introduced in v1.38.0. ([\#10433](#10433))
- Add base starting insertion event when no chunk ID is specified in the historical batch send API. ([\#10250](#10250))
- Fix historical batch send endpoint (MSC2716) rejecting batches with messages from multiple senders. ([\#10276](#10276))
- Fix purging rooms that other homeservers are still sending events for. Contributed by @ilmari. ([\#10317](#10317))
- Fix errors during backfill caused by previously purged redaction events. Contributed by Andreas Rammhold (@andir). ([\#10343](#10343))
- Fix the user directory becoming broken (and noisy errors being logged) when knocking and room statistics are in use. ([\#10344](#10344))
- Fix newly added `synapse_federation_server_oldest_inbound_pdu_in_staging` prometheus metric to measure age rather than timestamp. ([\#10355](#10355))
- Fix PostgreSQL sometimes using table scans for queries against `state_groups_state` table, taking a long time and a large amount of IO. ([\#10359](#10359))
- Fix `make_room_admin` failing for users that have left a private room. ([\#10367](#10367))
- Fix a number of logged errors caused by remote servers being down. ([\#10400](#10400), [\#10414](#10414))
- Responses from `/make_{join,leave,knock}` no longer include signatures, which will turn out to be invalid after events are returned to `/send_{join,leave,knock}`. ([\#10404](#10404))

Improved Documentation
----------------------

- Updated installation dependencies for newer macOS versions and ARM Macs. Contributed by Luke Walsh. ([\#9971](#9971))
- Simplify structure of room admin API. ([\#10313](#10313))
- Refresh the logcontext dev documentation. ([\#10353](#10353)), ([\#10337](#10337))
- Add delegation example for caddy in the reverse proxy documentation. Contributed by @moritzdietz. ([\#10368](#10368))
- Fix and clarify some links in `docs` and `contrib`. ([\#10370](#10370)), ([\#10322](#10322)), ([\#10399](#10399))
- Make deprecation notice of the spam checker doc more obvious. ([\#10395](#10395))
- Add instructions on installing Debian packages for release candidates. ([\#10396](#10396))

Deprecations and Removals
-------------------------

- Remove functionality associated with the unused `room_stats_historical` and `user_stats_historical` tables. Contributed by @xmunoz. ([\#9721](#9721))
- The third-party event rules module interface is deprecated in favour of the generic module interface introduced in Synapse v1.37.0. See the [upgrade notes](https://matrix-org.github.io/synapse/latest/upgrade.html#upgrading-to-v1390) for more information. ([\#10386](#10386))

Internal Changes
----------------

- Convert `room_depth.min_depth` column to a `BIGINT`. ([\#10289](#10289))
- Add tests to characterise the current behaviour of R30 phone-home metrics. ([\#10315](#10315))
- Rebuild event context and auth when processing specific results from `ThirdPartyEventRules` modules. ([\#10316](#10316))
- Minor change to the code that populates `user_daily_visits`. ([\#10324](#10324))
- Re-enable Sytests that were disabled for the 1.37.1 release. ([\#10345](#10345), [\#10357](#10357))
- Run `pyupgrade` on the codebase. ([\#10347](#10347), [\#10348](#10348))
- Switch `application_services_txns.txn_id` database column to `BIGINT`. ([\#10349](#10349))
- Convert internal type variable syntax to reflect wider ecosystem use. ([\#10350](#10350), [\#10380](#10380), [\#10381](#10381), [\#10382](#10382), [\#10418](#10418))
- Make the Github Actions workflow configuration more efficient. ([\#10383](#10383))
- Add type hints to `get_{domain,localpart}_from_id`. ([\#10385](#10385))
- When building Debian packages for prerelease versions, set the Section accordingly. ([\#10391](#10391))
- Add type hints and comments to event auth code. ([\#10393](#10393))
- Stagger sending of presence update to remote servers, reducing CPU spikes caused by starting many connections to remote servers at once. ([\#10398](#10398))
- Remove unused `events_by_room` code (tech debt). ([\#10421](#10421))
- Add a github actions job which records success of other jobs. ([\#10430](#10430))
aaronraimist added a commit to aaronraimist/synapse that referenced this pull request Jul 29, 2021
Synapse 1.39.0 (2021-07-29)
===========================

No significant changes.

Synapse 1.39.0rc3 (2021-07-28)
==============================

Bugfixes
--------

- Fix a bug introduced in Synapse 1.38 which caused an exception at startup when SAML authentication was enabled. ([\matrix-org#10477](matrix-org#10477))
- Fix a long-standing bug where Synapse would not inform clients that a device had exhausted its one-time-key pool, potentially causing problems decrypting events. ([\matrix-org#10485](matrix-org#10485))
- Fix reporting old R30 stats as R30v2 stats. Introduced in v1.39.0rc1. ([\matrix-org#10486](matrix-org#10486))

Internal Changes
----------------

- Fix an error which prevented the Github Actions workflow to build the docker images from running. ([\matrix-org#10461](matrix-org#10461))
- Fix release script to correctly version debian changelog when doing RCs. ([\matrix-org#10465](matrix-org#10465))

Synapse 1.39.0rc2 (2021-07-22)
==============================

This release also includes the changes in v1.38.1.

Internal Changes
----------------

- Move docker image build to Github Actions. ([\matrix-org#10416](matrix-org#10416))

Synapse 1.39.0rc1 (2021-07-20)
==============================

The Third-Party Event Rules module interface has been deprecated in favour of the generic module interface introduced in Synapse v1.37.0. Support for the old interface is planned to be removed in September 2021. See the [upgrade notes](https://matrix-org.github.io/synapse/latest/upgrade.html#upgrading-to-v1390) for more information.

Features
--------

- Add the ability to override the account validity feature with a module. ([\matrix-org#9884](matrix-org#9884))
- The spaces summary API now returns any joinable rooms, not only rooms which are world-readable. ([\matrix-org#10298](matrix-org#10298), [\matrix-org#10305](matrix-org#10305))
- Add a new version of the R30 phone-home metric, which removes a false impression of retention given by the old R30 metric. ([\matrix-org#10332](matrix-org#10332), [\matrix-org#10427](matrix-org#10427))
- Allow providing credentials to `http_proxy`. ([\matrix-org#10360](matrix-org#10360))

Bugfixes
--------

- Fix error while dropping locks on shutdown. Introduced in v1.38.0. ([\matrix-org#10433](matrix-org#10433))
- Add base starting insertion event when no chunk ID is specified in the historical batch send API. ([\matrix-org#10250](matrix-org#10250))
- Fix historical batch send endpoint (MSC2716) rejecting batches with messages from multiple senders. ([\matrix-org#10276](matrix-org#10276))
- Fix purging rooms that other homeservers are still sending events for. Contributed by @ilmari. ([\matrix-org#10317](matrix-org#10317))
- Fix errors during backfill caused by previously purged redaction events. Contributed by Andreas Rammhold (@andir). ([\matrix-org#10343](matrix-org#10343))
- Fix the user directory becoming broken (and noisy errors being logged) when knocking and room statistics are in use. ([\matrix-org#10344](matrix-org#10344))
- Fix newly added `synapse_federation_server_oldest_inbound_pdu_in_staging` prometheus metric to measure age rather than timestamp. ([\matrix-org#10355](matrix-org#10355))
- Fix PostgreSQL sometimes using table scans for queries against `state_groups_state` table, taking a long time and a large amount of IO. ([\matrix-org#10359](matrix-org#10359))
- Fix `make_room_admin` failing for users that have left a private room. ([\matrix-org#10367](matrix-org#10367))
- Fix a number of logged errors caused by remote servers being down. ([\matrix-org#10400](matrix-org#10400), [\matrix-org#10414](matrix-org#10414))
- Responses from `/make_{join,leave,knock}` no longer include signatures, which will turn out to be invalid after events are returned to `/send_{join,leave,knock}`. ([\matrix-org#10404](matrix-org#10404))

Improved Documentation
----------------------

- Updated installation dependencies for newer macOS versions and ARM Macs. Contributed by Luke Walsh. ([\matrix-org#9971](matrix-org#9971))
- Simplify structure of room admin API. ([\matrix-org#10313](matrix-org#10313))
- Refresh the logcontext dev documentation. ([\matrix-org#10353](matrix-org#10353)), ([\matrix-org#10337](matrix-org#10337))
- Add delegation example for caddy in the reverse proxy documentation. Contributed by @moritzdietz. ([\matrix-org#10368](matrix-org#10368))
- Fix and clarify some links in `docs` and `contrib`. ([\matrix-org#10370](matrix-org#10370)), ([\matrix-org#10322](matrix-org#10322)), ([\matrix-org#10399](matrix-org#10399))
- Make deprecation notice of the spam checker doc more obvious. ([\matrix-org#10395](matrix-org#10395))
- Add instructions on installing Debian packages for release candidates. ([\matrix-org#10396](matrix-org#10396))

Deprecations and Removals
-------------------------

- Remove functionality associated with the unused `room_stats_historical` and `user_stats_historical` tables. Contributed by @xmunoz. ([\matrix-org#9721](matrix-org#9721))
- The third-party event rules module interface is deprecated in favour of the generic module interface introduced in Synapse v1.37.0. See the [upgrade notes](https://matrix-org.github.io/synapse/latest/upgrade.html#upgrading-to-v1390) for more information. ([\matrix-org#10386](matrix-org#10386))

Internal Changes
----------------

- Convert `room_depth.min_depth` column to a `BIGINT`. ([\matrix-org#10289](matrix-org#10289))
- Add tests to characterise the current behaviour of R30 phone-home metrics. ([\matrix-org#10315](matrix-org#10315))
- Rebuild event context and auth when processing specific results from `ThirdPartyEventRules` modules. ([\matrix-org#10316](matrix-org#10316))
- Minor change to the code that populates `user_daily_visits`. ([\matrix-org#10324](matrix-org#10324))
- Re-enable Sytests that were disabled for the 1.37.1 release. ([\matrix-org#10345](matrix-org#10345), [\matrix-org#10357](matrix-org#10357))
- Run `pyupgrade` on the codebase. ([\matrix-org#10347](matrix-org#10347), [\matrix-org#10348](matrix-org#10348))
- Switch `application_services_txns.txn_id` database column to `BIGINT`. ([\matrix-org#10349](matrix-org#10349))
- Convert internal type variable syntax to reflect wider ecosystem use. ([\matrix-org#10350](matrix-org#10350), [\matrix-org#10380](matrix-org#10380), [\matrix-org#10381](matrix-org#10381), [\matrix-org#10382](matrix-org#10382), [\matrix-org#10418](matrix-org#10418))
- Make the Github Actions workflow configuration more efficient. ([\matrix-org#10383](matrix-org#10383))
- Add type hints to `get_{domain,localpart}_from_id`. ([\matrix-org#10385](matrix-org#10385))
- When building Debian packages for prerelease versions, set the Section accordingly. ([\matrix-org#10391](matrix-org#10391))
- Add type hints and comments to event auth code. ([\matrix-org#10393](matrix-org#10393))
- Stagger sending of presence update to remote servers, reducing CPU spikes caused by starting many connections to remote servers at once. ([\matrix-org#10398](matrix-org#10398))
- Remove unused `events_by_room` code (tech debt). ([\matrix-org#10421](matrix-org#10421))
- Add a github actions job which records success of other jobs. ([\matrix-org#10430](matrix-org#10430))
babolivier added a commit to matrix-org/synapse-dinsic that referenced this pull request Sep 1, 2021
Synapse 1.39.0 (2021-07-29)
===========================

No significant changes.

Synapse 1.39.0rc3 (2021-07-28)
==============================

Bugfixes
--------

- Fix a bug introduced in Synapse 1.38 which caused an exception at startup when SAML authentication was enabled. ([\#10477](matrix-org/synapse#10477))
- Fix a long-standing bug where Synapse would not inform clients that a device had exhausted its one-time-key pool, potentially causing problems decrypting events. ([\#10485](matrix-org/synapse#10485))
- Fix reporting old R30 stats as R30v2 stats. Introduced in v1.39.0rc1. ([\#10486](matrix-org/synapse#10486))

Internal Changes
----------------

- Fix an error which prevented the Github Actions workflow to build the docker images from running. ([\#10461](matrix-org/synapse#10461))
- Fix release script to correctly version debian changelog when doing RCs. ([\#10465](matrix-org/synapse#10465))

Synapse 1.39.0rc2 (2021-07-22)
==============================

This release also includes the changes in v1.38.1.

Internal Changes
----------------

- Move docker image build to Github Actions. ([\#10416](matrix-org/synapse#10416))

Synapse 1.39.0rc1 (2021-07-20)
==============================

The Third-Party Event Rules module interface has been deprecated in favour of the generic module interface introduced in Synapse v1.37.0. Support for the old interface is planned to be removed in September 2021. See the [upgrade notes](https://matrix-org.github.io/synapse/latest/upgrade.html#upgrading-to-v1390) for more information.

Features
--------

- Add the ability to override the account validity feature with a module. ([\#9884](matrix-org/synapse#9884))
- The spaces summary API now returns any joinable rooms, not only rooms which are world-readable. ([\#10298](matrix-org/synapse#10298), [\#10305](matrix-org/synapse#10305))
- Add a new version of the R30 phone-home metric, which removes a false impression of retention given by the old R30 metric. ([\#10332](matrix-org/synapse#10332), [\#10427](matrix-org/synapse#10427))
- Allow providing credentials to `http_proxy`. ([\#10360](matrix-org/synapse#10360))

Bugfixes
--------

- Fix error while dropping locks on shutdown. Introduced in v1.38.0. ([\#10433](matrix-org/synapse#10433))
- Add base starting insertion event when no chunk ID is specified in the historical batch send API. ([\#10250](matrix-org/synapse#10250))
- Fix historical batch send endpoint (MSC2716) rejecting batches with messages from multiple senders. ([\#10276](matrix-org/synapse#10276))
- Fix purging rooms that other homeservers are still sending events for. Contributed by @ilmari. ([\#10317](matrix-org/synapse#10317))
- Fix errors during backfill caused by previously purged redaction events. Contributed by Andreas Rammhold (@andir). ([\#10343](matrix-org/synapse#10343))
- Fix the user directory becoming broken (and noisy errors being logged) when knocking and room statistics are in use. ([\#10344](matrix-org/synapse#10344))
- Fix newly added `synapse_federation_server_oldest_inbound_pdu_in_staging` prometheus metric to measure age rather than timestamp. ([\#10355](matrix-org/synapse#10355))
- Fix PostgreSQL sometimes using table scans for queries against `state_groups_state` table, taking a long time and a large amount of IO. ([\#10359](matrix-org/synapse#10359))
- Fix `make_room_admin` failing for users that have left a private room. ([\#10367](matrix-org/synapse#10367))
- Fix a number of logged errors caused by remote servers being down. ([\#10400](matrix-org/synapse#10400), [\#10414](matrix-org/synapse#10414))
- Responses from `/make_{join,leave,knock}` no longer include signatures, which will turn out to be invalid after events are returned to `/send_{join,leave,knock}`. ([\#10404](matrix-org/synapse#10404))

Improved Documentation
----------------------

- Updated installation dependencies for newer macOS versions and ARM Macs. Contributed by Luke Walsh. ([\#9971](matrix-org/synapse#9971))
- Simplify structure of room admin API. ([\#10313](matrix-org/synapse#10313))
- Refresh the logcontext dev documentation. ([\#10353](matrix-org/synapse#10353)), ([\#10337](matrix-org/synapse#10337))
- Add delegation example for caddy in the reverse proxy documentation. Contributed by @moritzdietz. ([\#10368](matrix-org/synapse#10368))
- Fix and clarify some links in `docs` and `contrib`. ([\#10370](matrix-org/synapse#10370)), ([\#10322](matrix-org/synapse#10322)), ([\#10399](matrix-org/synapse#10399))
- Make deprecation notice of the spam checker doc more obvious. ([\#10395](matrix-org/synapse#10395))
- Add instructions on installing Debian packages for release candidates. ([\#10396](matrix-org/synapse#10396))

Deprecations and Removals
-------------------------

- Remove functionality associated with the unused `room_stats_historical` and `user_stats_historical` tables. Contributed by @xmunoz. ([\#9721](matrix-org/synapse#9721))
- The third-party event rules module interface is deprecated in favour of the generic module interface introduced in Synapse v1.37.0. See the [upgrade notes](https://matrix-org.github.io/synapse/latest/upgrade.html#upgrading-to-v1390) for more information. ([\#10386](matrix-org/synapse#10386))

Internal Changes
----------------

- Convert `room_depth.min_depth` column to a `BIGINT`. ([\#10289](matrix-org/synapse#10289))
- Add tests to characterise the current behaviour of R30 phone-home metrics. ([\#10315](matrix-org/synapse#10315))
- Rebuild event context and auth when processing specific results from `ThirdPartyEventRules` modules. ([\#10316](matrix-org/synapse#10316))
- Minor change to the code that populates `user_daily_visits`. ([\#10324](matrix-org/synapse#10324))
- Re-enable Sytests that were disabled for the 1.37.1 release. ([\#10345](matrix-org/synapse#10345), [\#10357](matrix-org/synapse#10357))
- Run `pyupgrade` on the codebase. ([\#10347](matrix-org/synapse#10347), [\#10348](matrix-org/synapse#10348))
- Switch `application_services_txns.txn_id` database column to `BIGINT`. ([\#10349](matrix-org/synapse#10349))
- Convert internal type variable syntax to reflect wider ecosystem use. ([\#10350](matrix-org/synapse#10350), [\#10380](matrix-org/synapse#10380), [\#10381](matrix-org/synapse#10381), [\#10382](matrix-org/synapse#10382), [\#10418](matrix-org/synapse#10418))
- Make the Github Actions workflow configuration more efficient. ([\#10383](matrix-org/synapse#10383))
- Add type hints to `get_{domain,localpart}_from_id`. ([\#10385](matrix-org/synapse#10385))
- When building Debian packages for prerelease versions, set the Section accordingly. ([\#10391](matrix-org/synapse#10391))
- Add type hints and comments to event auth code. ([\#10393](matrix-org/synapse#10393))
- Stagger sending of presence update to remote servers, reducing CPU spikes caused by starting many connections to remote servers at once. ([\#10398](matrix-org/synapse#10398))
- Remove unused `events_by_room` code (tech debt). ([\#10421](matrix-org/synapse#10421))
- Add a github actions job which records success of other jobs. ([\#10430](matrix-org/synapse#10430))
Fizzadar pushed a commit to Fizzadar/synapse that referenced this pull request Oct 26, 2021
Synapse 1.39.0 (2021-07-29)
===========================

No significant changes.

Synapse 1.39.0rc3 (2021-07-28)
==============================

Bugfixes
--------

- Fix a bug introduced in Synapse 1.38 which caused an exception at startup when SAML authentication was enabled. ([\matrix-org#10477](matrix-org#10477))
- Fix a long-standing bug where Synapse would not inform clients that a device had exhausted its one-time-key pool, potentially causing problems decrypting events. ([\matrix-org#10485](matrix-org#10485))
- Fix reporting old R30 stats as R30v2 stats. Introduced in v1.39.0rc1. ([\matrix-org#10486](matrix-org#10486))

Internal Changes
----------------

- Fix an error which prevented the Github Actions workflow to build the docker images from running. ([\matrix-org#10461](matrix-org#10461))
- Fix release script to correctly version debian changelog when doing RCs. ([\matrix-org#10465](matrix-org#10465))

Synapse 1.39.0rc2 (2021-07-22)
==============================

This release also includes the changes in v1.38.1.

Internal Changes
----------------

- Move docker image build to Github Actions. ([\matrix-org#10416](matrix-org#10416))

Synapse 1.39.0rc1 (2021-07-20)
==============================

The Third-Party Event Rules module interface has been deprecated in favour of the generic module interface introduced in Synapse v1.37.0. Support for the old interface is planned to be removed in September 2021. See the [upgrade notes](https://matrix-org.github.io/synapse/latest/upgrade.html#upgrading-to-v1390) for more information.

Features
--------

- Add the ability to override the account validity feature with a module. ([\matrix-org#9884](matrix-org#9884))
- The spaces summary API now returns any joinable rooms, not only rooms which are world-readable. ([\matrix-org#10298](matrix-org#10298), [\matrix-org#10305](matrix-org#10305))
- Add a new version of the R30 phone-home metric, which removes a false impression of retention given by the old R30 metric. ([\matrix-org#10332](matrix-org#10332), [\matrix-org#10427](matrix-org#10427))
- Allow providing credentials to `http_proxy`. ([\matrix-org#10360](matrix-org#10360))

Bugfixes
--------

- Fix error while dropping locks on shutdown. Introduced in v1.38.0. ([\matrix-org#10433](matrix-org#10433))
- Add base starting insertion event when no chunk ID is specified in the historical batch send API. ([\matrix-org#10250](matrix-org#10250))
- Fix historical batch send endpoint (MSC2716) rejecting batches with messages from multiple senders. ([\matrix-org#10276](matrix-org#10276))
- Fix purging rooms that other homeservers are still sending events for. Contributed by @ilmari. ([\matrix-org#10317](matrix-org#10317))
- Fix errors during backfill caused by previously purged redaction events. Contributed by Andreas Rammhold (@andir). ([\matrix-org#10343](matrix-org#10343))
- Fix the user directory becoming broken (and noisy errors being logged) when knocking and room statistics are in use. ([\matrix-org#10344](matrix-org#10344))
- Fix newly added `synapse_federation_server_oldest_inbound_pdu_in_staging` prometheus metric to measure age rather than timestamp. ([\matrix-org#10355](matrix-org#10355))
- Fix PostgreSQL sometimes using table scans for queries against `state_groups_state` table, taking a long time and a large amount of IO. ([\matrix-org#10359](matrix-org#10359))
- Fix `make_room_admin` failing for users that have left a private room. ([\matrix-org#10367](matrix-org#10367))
- Fix a number of logged errors caused by remote servers being down. ([\matrix-org#10400](matrix-org#10400), [\matrix-org#10414](matrix-org#10414))
- Responses from `/make_{join,leave,knock}` no longer include signatures, which will turn out to be invalid after events are returned to `/send_{join,leave,knock}`. ([\matrix-org#10404](matrix-org#10404))

Improved Documentation
----------------------

- Updated installation dependencies for newer macOS versions and ARM Macs. Contributed by Luke Walsh. ([\matrix-org#9971](matrix-org#9971))
- Simplify structure of room admin API. ([\matrix-org#10313](matrix-org#10313))
- Refresh the logcontext dev documentation. ([\matrix-org#10353](matrix-org#10353)), ([\matrix-org#10337](matrix-org#10337))
- Add delegation example for caddy in the reverse proxy documentation. Contributed by @moritzdietz. ([\matrix-org#10368](matrix-org#10368))
- Fix and clarify some links in `docs` and `contrib`. ([\matrix-org#10370](matrix-org#10370)), ([\matrix-org#10322](matrix-org#10322)), ([\matrix-org#10399](matrix-org#10399))
- Make deprecation notice of the spam checker doc more obvious. ([\matrix-org#10395](matrix-org#10395))
- Add instructions on installing Debian packages for release candidates. ([\matrix-org#10396](matrix-org#10396))

Deprecations and Removals
-------------------------

- Remove functionality associated with the unused `room_stats_historical` and `user_stats_historical` tables. Contributed by @xmunoz. ([\matrix-org#9721](matrix-org#9721))
- The third-party event rules module interface is deprecated in favour of the generic module interface introduced in Synapse v1.37.0. See the [upgrade notes](https://matrix-org.github.io/synapse/latest/upgrade.html#upgrading-to-v1390) for more information. ([\matrix-org#10386](matrix-org#10386))

Internal Changes
----------------

- Convert `room_depth.min_depth` column to a `BIGINT`. ([\matrix-org#10289](matrix-org#10289))
- Add tests to characterise the current behaviour of R30 phone-home metrics. ([\matrix-org#10315](matrix-org#10315))
- Rebuild event context and auth when processing specific results from `ThirdPartyEventRules` modules. ([\matrix-org#10316](matrix-org#10316))
- Minor change to the code that populates `user_daily_visits`. ([\matrix-org#10324](matrix-org#10324))
- Re-enable Sytests that were disabled for the 1.37.1 release. ([\matrix-org#10345](matrix-org#10345), [\matrix-org#10357](matrix-org#10357))
- Run `pyupgrade` on the codebase. ([\matrix-org#10347](matrix-org#10347), [\matrix-org#10348](matrix-org#10348))
- Switch `application_services_txns.txn_id` database column to `BIGINT`. ([\matrix-org#10349](matrix-org#10349))
- Convert internal type variable syntax to reflect wider ecosystem use. ([\matrix-org#10350](matrix-org#10350), [\matrix-org#10380](matrix-org#10380), [\matrix-org#10381](matrix-org#10381), [\matrix-org#10382](matrix-org#10382), [\matrix-org#10418](matrix-org#10418))
- Make the Github Actions workflow configuration more efficient. ([\matrix-org#10383](matrix-org#10383))
- Add type hints to `get_{domain,localpart}_from_id`. ([\matrix-org#10385](matrix-org#10385))
- When building Debian packages for prerelease versions, set the Section accordingly. ([\matrix-org#10391](matrix-org#10391))
- Add type hints and comments to event auth code. ([\matrix-org#10393](matrix-org#10393))
- Stagger sending of presence update to remote servers, reducing CPU spikes caused by starting many connections to remote servers at once. ([\matrix-org#10398](matrix-org#10398))
- Remove unused `events_by_room` code (tech debt). ([\matrix-org#10421](matrix-org#10421))
- Add a github actions job which records success of other jobs. ([\matrix-org#10430](matrix-org#10430))
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Synapse does not tell the clients when it runs out of OTKs
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