Tags

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

- Fix incompatibility with older Twisted version in tests. Thanks
  @OlegGirko!
([\#3940](https://github.com/matrix-org/synapse/issues/3940))

Features
--------

- Python 3.5 and 3.6 support is now in beta.
([\#3576](https://github.com/matrix-org/synapse/issues/3576))
- Implement `event_format` filter param in `/sync`
([\#3790](https://github.com/matrix-org/synapse/issues/3790))
- Add synapse_admin_mau:registered_reserved_users metric to expose
number of real reaserved users
([\#3846](https://github.com/matrix-org/synapse/issues/3846))

Bugfixes
--------

- Remove connection ID for replication prometheus metrics, as it creates
a large number of new series.
([\#3788](https://github.com/matrix-org/synapse/issues/3788))
- guest users should not be part of mau total
([\#3800](https://github.com/matrix-org/synapse/issues/3800))
- Bump dependency on pyopenssl 16.x, to avoid incompatibility with
recent Twisted.
([\#3804](https://github.com/matrix-org/synapse/issues/3804))
- Fix existing room tags not coming down sync when joining a room
([\#3810](https://github.com/matrix-org/synapse/issues/3810))
- Fix jwt import check
([\#3824](https://github.com/matrix-org/synapse/issues/3824))
- fix VOIP crashes under Python 3 (#3821)
([\#3835](https://github.com/matrix-org/synapse/issues/3835))
- Fix manhole so that it works with latest openssh clients
([\#3841](https://github.com/matrix-org/synapse/issues/3841))
- Fix outbound requests occasionally wedging, which can result in
federation breaking between servers.
([\#3845](https://github.com/matrix-org/synapse/issues/3845))
- Show heroes if room name/canonical alias has been deleted
([\#3851](https://github.com/matrix-org/synapse/issues/3851))
- Fix handling of redacted events from federation
([\#3859](https://github.com/matrix-org/synapse/issues/3859))
-  ([\#3874](https://github.com/matrix-org/synapse/issues/3874))
- Mitigate outbound federation randomly becoming wedged
([\#3875](https://github.com/matrix-org/synapse/issues/3875))

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

- CircleCI tests now run on the potential merge of a PR.
([\#3704](https://github.com/matrix-org/synapse/issues/3704))
- http/ is now ported to Python 3.
([\#3771](https://github.com/matrix-org/synapse/issues/3771))
- Improve human readable error messages for threepid
registration/account update
([\#3789](https://github.com/matrix-org/synapse/issues/3789))
- Make /sync slightly faster by avoiding needless copies
([\#3795](https://github.com/matrix-org/synapse/issues/3795))
- handlers/ is now ported to Python 3.
([\#3803](https://github.com/matrix-org/synapse/issues/3803))
- Limit the number of PDUs/EDUs per federation transaction
([\#3805](https://github.com/matrix-org/synapse/issues/3805))
- Only start postgres instance for postgres tests on Travis CI
([\#3806](https://github.com/matrix-org/synapse/issues/3806))
- tests/ is now ported to Python 3.
([\#3808](https://github.com/matrix-org/synapse/issues/3808))
- crypto/ is now ported to Python 3.
([\#3822](https://github.com/matrix-org/synapse/issues/3822))
- rest/ is now ported to Python 3.
([\#3823](https://github.com/matrix-org/synapse/issues/3823))
- add some logging for the keyring queue
([\#3826](https://github.com/matrix-org/synapse/issues/3826))
- speed up lazy loading by 2-3x
([\#3827](https://github.com/matrix-org/synapse/issues/3827))
- Improved Dockerfile to remove build requirements after building
reducing the image size.
([\#3834](https://github.com/matrix-org/synapse/issues/3834))
- Disable lazy loading for incremental syncs for now
([\#3840](https://github.com/matrix-org/synapse/issues/3840))
- federation/ is now ported to Python 3.
([\#3847](https://github.com/matrix-org/synapse/issues/3847))
- Log when we retry outbound requests
([\#3853](https://github.com/matrix-org/synapse/issues/3853))
- Removed some excess logging messages.
([\#3855](https://github.com/matrix-org/synapse/issues/3855))
- Speed up purge history for rooms that have been previously purged
([\#3856](https://github.com/matrix-org/synapse/issues/3856))
- Refactor some HTTP timeout code.
([\#3857](https://github.com/matrix-org/synapse/issues/3857))
- Fix running merged builds on CircleCI
([\#3858](https://github.com/matrix-org/synapse/issues/3858))
- Fix typo in replication stream exception.
([\#3860](https://github.com/matrix-org/synapse/issues/3860))
- Add in flight real time metrics for Measure blocks
([\#3871](https://github.com/matrix-org/synapse/issues/3871))
- Disable buffering and automatic retrying in treq requests to prevent
timeouts. ([\#3872](https://github.com/matrix-org/synapse/issues/3872))
- mention jemalloc in the README
([\#3877](https://github.com/matrix-org/synapse/issues/3877))
- Remove unmaintained "nuke-room-from-db.sh" script
([\#3888](https://github.com/matrix-org/synapse/issues/3888))

Features
--------

- Python 3.5 and 3.6 support is now in beta.
([\#3576](https://github.com/matrix-org/synapse/issues/3576))
- Implement `event_format` filter param in `/sync`
([\#3790](https://github.com/matrix-org/synapse/issues/3790))
- Add synapse_admin_mau:registered_reserved_users metric to expose
number of real reaserved users
([\#3846](https://github.com/matrix-org/synapse/issues/3846))

Bugfixes
--------

- Remove connection ID for replication prometheus metrics, as it creates
a large number of new series.
([\#3788](https://github.com/matrix-org/synapse/issues/3788))
- guest users should not be part of mau total
([\#3800](https://github.com/matrix-org/synapse/issues/3800))
- Bump dependency on pyopenssl 16.x, to avoid incompatibility with
recent Twisted.
([\#3804](https://github.com/matrix-org/synapse/issues/3804))
- Fix existing room tags not coming down sync when joining a room
([\#3810](https://github.com/matrix-org/synapse/issues/3810))
- Fix jwt import check
([\#3824](https://github.com/matrix-org/synapse/issues/3824))
- fix VOIP crashes under Python 3 (#3821)
([\#3835](https://github.com/matrix-org/synapse/issues/3835))
- Fix manhole so that it works with latest openssh clients
([\#3841](https://github.com/matrix-org/synapse/issues/3841))
- Fix outbound requests occasionally wedging, which can result in
federation breaking between servers.
([\#3845](https://github.com/matrix-org/synapse/issues/3845))
- Show heroes if room name/canonical alias has been deleted
([\#3851](https://github.com/matrix-org/synapse/issues/3851))
- Fix handling of redacted events from federation
([\#3859](https://github.com/matrix-org/synapse/issues/3859))
-  ([\#3874](https://github.com/matrix-org/synapse/issues/3874))
- Mitigate outbound federation randomly becoming wedged
([\#3875](https://github.com/matrix-org/synapse/issues/3875))

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

- CircleCI tests now run on the potential merge of a PR.
([\#3704](https://github.com/matrix-org/synapse/issues/3704))
- http/ is now ported to Python 3.
([\#3771](https://github.com/matrix-org/synapse/issues/3771))
- Improve human readable error messages for threepid
registration/account update
([\#3789](https://github.com/matrix-org/synapse/issues/3789))
- Make /sync slightly faster by avoiding needless copies
([\#3795](https://github.com/matrix-org/synapse/issues/3795))
- handlers/ is now ported to Python 3.
([\#3803](https://github.com/matrix-org/synapse/issues/3803))
- Limit the number of PDUs/EDUs per federation transaction
([\#3805](https://github.com/matrix-org/synapse/issues/3805))
- Only start postgres instance for postgres tests on Travis CI
([\#3806](https://github.com/matrix-org/synapse/issues/3806))
- tests/ is now ported to Python 3.
([\#3808](https://github.com/matrix-org/synapse/issues/3808))
- crypto/ is now ported to Python 3.
([\#3822](https://github.com/matrix-org/synapse/issues/3822))
- rest/ is now ported to Python 3.
([\#3823](https://github.com/matrix-org/synapse/issues/3823))
- add some logging for the keyring queue
([\#3826](https://github.com/matrix-org/synapse/issues/3826))
- speed up lazy loading by 2-3x
([\#3827](https://github.com/matrix-org/synapse/issues/3827))
- Improved Dockerfile to remove build requirements after building
reducing the image size.
([\#3834](https://github.com/matrix-org/synapse/issues/3834))
- Disable lazy loading for incremental syncs for now
([\#3840](https://github.com/matrix-org/synapse/issues/3840))
- federation/ is now ported to Python 3.
([\#3847](https://github.com/matrix-org/synapse/issues/3847))
- Log when we retry outbound requests
([\#3853](https://github.com/matrix-org/synapse/issues/3853))
- Removed some excess logging messages.
([\#3855](https://github.com/matrix-org/synapse/issues/3855))
- Speed up purge history for rooms that have been previously purged
([\#3856](https://github.com/matrix-org/synapse/issues/3856))
- Refactor some HTTP timeout code.
([\#3857](https://github.com/matrix-org/synapse/issues/3857))
- Fix running merged builds on CircleCI
([\#3858](https://github.com/matrix-org/synapse/issues/3858))
- Fix typo in replication stream exception.
([\#3860](https://github.com/matrix-org/synapse/issues/3860))
- Add in flight real time metrics for Measure blocks
([\#3871](https://github.com/matrix-org/synapse/issues/3871))
- Disable buffering and automatic retrying in treq requests to prevent
timeouts. ([\#3872](https://github.com/matrix-org/synapse/issues/3872))
- mention jemalloc in the README
([\#3877](https://github.com/matrix-org/synapse/issues/3877))
- Remove unmaintained "nuke-room-from-db.sh" script
([\#3888](https://github.com/matrix-org/synapse/issues/3888))

Features
--------

- Support profile API endpoints on workers
([\#3659](https://github.com/matrix-org/synapse/issues/3659))
- Server notices for resource limit blocking
([\#3680](https://github.com/matrix-org/synapse/issues/3680))
- Allow guests to use /rooms/:roomId/event/:eventId
([\#3724](https://github.com/matrix-org/synapse/issues/3724))
- Add mau_trial_days config param, so that users only get counted as MAU
after N days.
([\#3749](https://github.com/matrix-org/synapse/issues/3749))
- Require twisted 17.1 or later (fixes
[#3741](https://github.com/matrix-org/synapse/issues/3741)).
([\#3751](https://github.com/matrix-org/synapse/issues/3751))

Bugfixes
--------

- Fix error collecting prometheus metrics when run on dedicated thread
due to threading concurrency issues
([\#3722](https://github.com/matrix-org/synapse/issues/3722))
- Fix bug where we resent "limit exceeded" server notices repeatedly
([\#3747](https://github.com/matrix-org/synapse/issues/3747))
- Fix bug where we broke sync when using limit_usage_by_mau but hadn't
configured server notices
([\#3753](https://github.com/matrix-org/synapse/issues/3753))
- Fix 'federation_domain_whitelist' such that an empty list correctly
blocks all outbound federation traffic
([\#3754](https://github.com/matrix-org/synapse/issues/3754))
- Fix tagging of server notice rooms
([\#3755](https://github.com/matrix-org/synapse/issues/3755),
[\#3756](https://github.com/matrix-org/synapse/issues/3756))
- Fix 'admin_uri' config variable and error parameter to be
'admin_contact' to match the spec.
([\#3758](https://github.com/matrix-org/synapse/issues/3758))
- Don't return non-LL-member state in incremental sync state blocks
([\#3760](https://github.com/matrix-org/synapse/issues/3760))
- Fix bug in sending presence over federation
([\#3768](https://github.com/matrix-org/synapse/issues/3768))
- Fix bug where preserved threepid user comes to sign up and server is
mau blocked
([\#3777](https://github.com/matrix-org/synapse/issues/3777))

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

- Removed the link to the unmaintained matrix-synapse-auto-deploy
project from the readme.
([\#3378](https://github.com/matrix-org/synapse/issues/3378))
- Refactor state module to support multiple room versions
([\#3673](https://github.com/matrix-org/synapse/issues/3673))
- The synapse.storage module has been ported to Python 3.
([\#3725](https://github.com/matrix-org/synapse/issues/3725))
- Split the state_group_cache into member and non-member state events
(and so speed up LL /sync)
([\#3726](https://github.com/matrix-org/synapse/issues/3726))
- Log failure to authenticate remote servers as warnings (without stack
traces) ([\#3727](https://github.com/matrix-org/synapse/issues/3727))
- The CONTRIBUTING guidelines have been updated to mention our use of
Markdown and that .misc files have content.
([\#3730](https://github.com/matrix-org/synapse/issues/3730))
- Reference the need for an HTTP replication port when using the
federation_reader worker
([\#3734](https://github.com/matrix-org/synapse/issues/3734))
- Fix minor spelling error in federation client documentation.
([\#3735](https://github.com/matrix-org/synapse/issues/3735))
- Remove redundant state resolution function
([\#3737](https://github.com/matrix-org/synapse/issues/3737))
- The test suite now passes on PostgreSQL.
([\#3740](https://github.com/matrix-org/synapse/issues/3740))
- Fix MAU cache invalidation due to missing yield
([\#3746](https://github.com/matrix-org/synapse/issues/3746))
- Make sure that we close db connections opened during init
([\#3764](https://github.com/matrix-org/synapse/issues/3764))

Synapse 0.33.4rc2 (2018-09-06)
==============================

Pull in security fixes from v0.33.3.1

Synapse 0.33.2.1 (2018-09-06)
=============================

SECURITY FIXES
--------------

- Fix an issue where event signatures were not always correctly validated ([\#3796](https://github.com/matrix-org/synapse/issues/3796))
- Fix an issue where server_acls could be circumvented for incoming events ([\#3796](https://github.com/matrix-org/synapse/issues/3796))

Synapse 0.33.3.1 (2018-09-06)
=============================

SECURITY FIXES
--------------

- Fix an issue where event signatures were not always correctly validated ([\#3796](https://github.com/matrix-org/synapse/issues/3796))
- Fix an issue where server_acls could be circumvented for incoming events ([\#3796](https://github.com/matrix-org/synapse/issues/3796))

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

- Unignore synctl in .dockerignore to fix docker builds ([\#3802](https://github.com/matrix-org/synapse/issues/3802))

hhs-5

Synapse 0.33.4rc1 (2018-09-04)
==============================

Features
--------

- Support profile API endpoints on workers ([\#3659](https://github.com/matrix-org/synapse/issues/3659))
- Server notices for resource limit blocking ([\#3680](https://github.com/matrix-org/synapse/issues/3680))
- Allow guests to use /rooms/:roomId/event/:eventId ([\#3724](https://github.com/matrix-org/synapse/issues/3724))
- Add mau_trial_days config param, so that users only get counted as MAU after N days. ([\#3749](https://github.com/matrix-org/synapse/issues/3749))
- Require twisted 17.1 or later (fixes [#3741](https://github.com/matrix-org/synapse/issues/3741)). ([\#3751](https://github.com/matrix-org/synapse/issues/3751))

Bugfixes
--------

- Fix error collecting prometheus metrics when run on dedicated thread due to threading concurrency issues ([\#3722](https://github.com/matrix-org/synapse/issues/3722))
- Fix bug where we resent "limit exceeded" server notices repeatedly ([\#3747](https://github.com/matrix-org/synapse/issues/3747))
- Fix bug where we broke sync when using limit_usage_by_mau but hadn't configured server notices ([\#3753](https://github.com/matrix-org/synapse/issues/3753))
- Fix 'federation_domain_whitelist' such that an empty list correctly blocks all outbound federation traffic ([\#3754](https://github.com/matrix-org/synapse/issues/3754))
- Fix tagging of server notice rooms ([\#3755](https://github.com/matrix-org/synapse/issues/3755), [\#3756](https://github.com/matrix-org/synapse/issues/3756))
- Fix 'admin_uri' config variable and error parameter to be 'admin_contact' to match the spec. ([\#3758](https://github.com/matrix-org/synapse/issues/3758))
- Don't return non-LL-member state in incremental sync state blocks ([\#3760](https://github.com/matrix-org/synapse/issues/3760))
- Fix bug in sending presence over federation ([\#3768](https://github.com/matrix-org/synapse/issues/3768))
- Fix bug where preserved threepid user comes to sign up and server is mau blocked ([\#3777](https://github.com/matrix-org/synapse/issues/3777))

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

- Removed the link to the unmaintained matrix-synapse-auto-deploy project from the readme. ([\#3378](https://github.com/matrix-org/synapse/issues/3378))
- Refactor state module to support multiple room versions ([\#3673](https://github.com/matrix-org/synapse/issues/3673))
- The synapse.storage module has been ported to Python 3. ([\#3725](https://github.com/matrix-org/synapse/issues/3725))
- Split the state_group_cache into member and non-member state events (and so speed up LL /sync) ([\#3726](https://github.com/matrix-org/synapse/issues/3726))
- Log failure to authenticate remote servers as warnings (without stack traces) ([\#3727](https://github.com/matrix-org/synapse/issues/3727))
- The CONTRIBUTING guidelines have been updated to mention our use of Markdown and that .misc files have content. ([\#3730](https://github.com/matrix-org/synapse/issues/3730))
- Reference the need for an HTTP replication port when using the federation_reader worker ([\#3734](https://github.com/matrix-org/synapse/issues/3734))
- Fix minor spelling error in federation client documentation. ([\#3735](https://github.com/matrix-org/synapse/issues/3735))
- Remove redundant state resolution function ([\#3737](https://github.com/matrix-org/synapse/issues/3737))
- The test suite now passes on PostgreSQL. ([\#3740](https://github.com/matrix-org/synapse/issues/3740))
- Fix MAU cache invalidation due to missing yield ([\#3746](https://github.com/matrix-org/synapse/issues/3746))
- Make sure that we close db connections opened during init ([\#3764](https://github.com/matrix-org/synapse/issues/3764))

HHS tag 3

HHS tag 2

HHS tag 1

Features
--------

- Add support for the SNI extension to federation TLS connections. Thanks to @vojeroen! ([\#3439](https://github.com/matrix-org/synapse/issues/3439))
- Add /_media/r0/config ([\#3184](https://github.com/matrix-org/synapse/issues/3184))
- speed up /members API and add `at` and `membership` params as per MSC1227 ([\#3568](https://github.com/matrix-org/synapse/issues/3568))
- implement `summary` block in /sync response as per MSC688 ([\#3574](https://github.com/matrix-org/synapse/issues/3574))
- Add lazy-loading support to /messages as per MSC1227 ([\#3589](https://github.com/matrix-org/synapse/issues/3589))
- Add ability to limit number of monthly active users on the server ([\#3633](https://github.com/matrix-org/synapse/issues/3633))
- Support more federation endpoints on workers ([\#3653](https://github.com/matrix-org/synapse/issues/3653))
- Basic support for room versioning ([\#3654](https://github.com/matrix-org/synapse/issues/3654))
- Ability to disable client/server Synapse via conf toggle ([\#3655](https://github.com/matrix-org/synapse/issues/3655))
- Ability to whitelist specific threepids against monthly active user limiting ([\#3662](https://github.com/matrix-org/synapse/issues/3662))
- Add some metrics for the appservice and federation event sending loops ([\#3664](https://github.com/matrix-org/synapse/issues/3664))
- Where server is disabled, block ability for locked out users to read new messages ([\#3670](https://github.com/matrix-org/synapse/issues/3670))
- set admin uri via config, to be used in error messages where the user should contact the administrator ([\#3687](https://github.com/matrix-org/synapse/issues/3687))
- Synapse's presence functionality can now be disabled with the "use_presence" configuration option. ([\#3694](https://github.com/matrix-org/synapse/issues/3694))
- For resource limit blocked users, prevent writing into rooms ([\#3708](https://github.com/matrix-org/synapse/issues/3708))

Bugfixes
--------

- Fix occasional glitches in the synapse_event_persisted_position metric ([\#3658](https://github.com/matrix-org/synapse/issues/3658))
- Fix bug on deleting 3pid when using identity servers that don't support unbind API ([\#3661](https://github.com/matrix-org/synapse/issues/3661))
- Make the tests pass on Twisted < 18.7.0 ([\#3676](https://github.com/matrix-org/synapse/issues/3676))
- Don’t ship recaptcha_ajax.js, use it directly from Google ([\#3677](https://github.com/matrix-org/synapse/issues/3677))
- Fixes test_reap_monthly_active_users so it passes under postgres ([\#3681](https://github.com/matrix-org/synapse/issues/3681))
- Fix mau blocking calulation bug on login ([\#3689](https://github.com/matrix-org/synapse/issues/3689))
- Fix missing yield in synapse.storage.monthly_active_users.initialise_reserved_users ([\#3692](https://github.com/matrix-org/synapse/issues/3692))
- Improve HTTP request logging to include all requests ([\#3700](https://github.com/matrix-org/synapse/issues/3700))
- Avoid timing out requests while we are streaming back the response ([\#3701](https://github.com/matrix-org/synapse/issues/3701))
- Support more federation endpoints on workers ([\#3705](https://github.com/matrix-org/synapse/issues/3705), [\#3713](https://github.com/matrix-org/synapse/issues/3713))
- Fix "Starting db txn 'get_all_updated_receipts' from sentinel context" warning ([\#3710](https://github.com/matrix-org/synapse/issues/3710))
- Fix bug where `state_cache` cache factor ignored environment variables ([\#3719](https://github.com/matrix-org/synapse/issues/3719))
- Fix bug in v0.33.3rc1 which caused infinite loops and OOMs ([\#3723](https://github.com/matrix-org/synapse/issues/3723))
- Fix bug introduced in v0.33.3rc1 which made the ToS give a 500 error ([\#3732](https://github.com/matrix-org/synapse/issues/3732))

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

- The Shared-Secret registration method of the legacy v1/register REST endpoint has been removed. For a replacement, please see [the admin/register API documentation](https://github.com/matrix-org/synapse/blob/master/docs/admin_api/register_api.rst). ([\#3703](https://github.com/matrix-org/synapse/issues/3703))

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

- The test suite now can run under PostgreSQL. ([\#3423](https://github.com/matrix-org/synapse/issues/3423))
- Refactor HTTP replication endpoints to reduce code duplication ([\#3632](https://github.com/matrix-org/synapse/issues/3632))
- Tests now correctly execute on Python 3. ([\#3647](https://github.com/matrix-org/synapse/issues/3647))
- Sytests can now be run inside a Docker container. ([\#3660](https://github.com/matrix-org/synapse/issues/3660))
- Port over enough to Python 3 to allow the sytests to start. ([\#3668](https://github.com/matrix-org/synapse/issues/3668))
- Update docker base image from alpine 3.7 to 3.8. ([\#3669](https://github.com/matrix-org/synapse/issues/3669))
- Rename synapse.util.async to synapse.util.async_helpers to mitigate async becoming a keyword on Python 3.7. ([\#3678](https://github.com/matrix-org/synapse/issues/3678))
- Synapse's tests are now formatted with the black autoformatter. ([\#3679](https://github.com/matrix-org/synapse/issues/3679))
- Implemented a new testing base class to reduce test boilerplate. ([\#3684](https://github.com/matrix-org/synapse/issues/3684))
- Rename MAU prometheus metrics ([\#3690](https://github.com/matrix-org/synapse/issues/3690))
- add new error type ResourceLimit ([\#3707](https://github.com/matrix-org/synapse/issues/3707))
- Logcontexts for replication command handlers ([\#3709](https://github.com/matrix-org/synapse/issues/3709))
- Update admin register API documentation to reference a real user ID. ([\#3712](https://github.com/matrix-org/synapse/issues/3712))

Bugfixes
--------

- Fix bug in v0.33.3rc1 which caused infinite loops and OOMs
([\#3723](https://github.com/matrix-org/synapse/issues/3723))

Features
--------

- Add support for the SNI extension to federation TLS connections
([\#1491](https://github.com/matrix-org/synapse/issues/1491))
- Add /_media/r0/config
([\#3184](https://github.com/matrix-org/synapse/issues/3184))
- speed up /members API and add `at` and `membership` params as per
MSC1227 ([\#3568](https://github.com/matrix-org/synapse/issues/3568))
- implement `summary` block in /sync response as per MSC688
([\#3574](https://github.com/matrix-org/synapse/issues/3574))
- Add lazy-loading support to /messages as per MSC1227
([\#3589](https://github.com/matrix-org/synapse/issues/3589))
- Add ability to limit number of monthly active users on the server
([\#3633](https://github.com/matrix-org/synapse/issues/3633))
- Support more federation endpoints on workers
([\#3653](https://github.com/matrix-org/synapse/issues/3653))
- Basic support for room versioning
([\#3654](https://github.com/matrix-org/synapse/issues/3654))
- Ability to disable client/server Synapse via conf toggle
([\#3655](https://github.com/matrix-org/synapse/issues/3655))
- Ability to whitelist specific threepids against monthly active user
limiting ([\#3662](https://github.com/matrix-org/synapse/issues/3662))
- Add some metrics for the appservice and federation event sending loops
([\#3664](https://github.com/matrix-org/synapse/issues/3664))
- Where server is disabled, block ability for locked out users to read
new messages
([\#3670](https://github.com/matrix-org/synapse/issues/3670))
- set admin uri via config, to be used in error messages where the user
should contact the administrator
([\#3687](https://github.com/matrix-org/synapse/issues/3687))
- Synapse's presence functionality can now be disabled with the
"use_presence" configuration option.
([\#3694](https://github.com/matrix-org/synapse/issues/3694))
- For resource limit blocked users, prevent writing into rooms
([\#3708](https://github.com/matrix-org/synapse/issues/3708))

Bugfixes
--------

- Fix occasional glitches in the synapse_event_persisted_position metric
([\#3658](https://github.com/matrix-org/synapse/issues/3658))
- Fix bug on deleting 3pid when using identity servers that don't
support unbind API
([\#3661](https://github.com/matrix-org/synapse/issues/3661))
- Make the tests pass on Twisted < 18.7.0
([\#3676](https://github.com/matrix-org/synapse/issues/3676))
- Don’t ship recaptcha_ajax.js, use it directly from Google
([\#3677](https://github.com/matrix-org/synapse/issues/3677))
- Fixes test_reap_monthly_active_users so it passes under postgres
([\#3681](https://github.com/matrix-org/synapse/issues/3681))
- Fix mau blocking calulation bug on login
([\#3689](https://github.com/matrix-org/synapse/issues/3689))
- Fix missing yield in
synapse.storage.monthly_active_users.initialise_reserved_users
([\#3692](https://github.com/matrix-org/synapse/issues/3692))
- Improve HTTP request logging to include all requests
([\#3700](https://github.com/matrix-org/synapse/issues/3700))
- Avoid timing out requests while we are streaming back the response
([\#3701](https://github.com/matrix-org/synapse/issues/3701))
- Support more federation endpoints on workers
([\#3705](https://github.com/matrix-org/synapse/issues/3705),
[\#3713](https://github.com/matrix-org/synapse/issues/3713))
- Fix "Starting db txn 'get_all_updated_receipts' from sentinel context"
warning ([\#3710](https://github.com/matrix-org/synapse/issues/3710))
- Fix bug where `state_cache` cache factor ignored environment variables
([\#3719](https://github.com/matrix-org/synapse/issues/3719))

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

- The Shared-Secret registration method of the legacy v1/register REST
endpoint has been removed. For a replacement, please see [the
admin/register API
documentation](https://github.com/matrix-org/synapse/blob/master/docs/admin_api/register_api.rst).
([\#3703](https://github.com/matrix-org/synapse/issues/3703))

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

- The test suite now can run under PostgreSQL.
([\#3423](https://github.com/matrix-org/synapse/issues/3423))
- Refactor HTTP replication endpoints to reduce code duplication
([\#3632](https://github.com/matrix-org/synapse/issues/3632))
- Tests now correctly execute on Python 3.
([\#3647](https://github.com/matrix-org/synapse/issues/3647))
- Sytests can now be run inside a Docker container.
([\#3660](https://github.com/matrix-org/synapse/issues/3660))
- Port over enough to Python 3 to allow the sytests to start.
([\#3668](https://github.com/matrix-org/synapse/issues/3668))
- Update docker base image from alpine 3.7 to 3.8.
([\#3669](https://github.com/matrix-org/synapse/issues/3669))
- Rename synapse.util.async to synapse.util.async_helpers to mitigate
async becoming a keyword on Python 3.7.
([\#3678](https://github.com/matrix-org/synapse/issues/3678))
- Synapse's tests are now formatted with the black autoformatter.
([\#3679](https://github.com/matrix-org/synapse/issues/3679))
- Implemented a new testing base class to reduce test boilerplate.
([\#3684](https://github.com/matrix-org/synapse/issues/3684))
- Rename MAU prometheus metrics
([\#3690](https://github.com/matrix-org/synapse/issues/3690))
- add new error type ResourceLimit
([\#3707](https://github.com/matrix-org/synapse/issues/3707))
- Logcontexts for replication command handlers
([\#3709](https://github.com/matrix-org/synapse/issues/3709))
- Update admin register API documentation to reference a real user ID.
([\#3712](https://github.com/matrix-org/synapse/issues/3712))

Features
--------

- add support for the lazy_loaded_members filter as per MSC1227 ([\#2970](https://github.com/matrix-org/synapse/issues/2970))
- add support for the include_redundant_members filter param as per MSC1227 ([\#3331](https://github.com/matrix-org/synapse/issues/3331))
- Add metrics to track resource usage by background processes ([\#3553](https://github.com/matrix-org/synapse/issues/3553), [\#3556](https://github.com/matrix-org/synapse/issues/3556),
[\#3604](https://github.com/matrix-org/synapse/issues/3604), [\#3610](https://github.com/matrix-org/synapse/issues/3610))
- Add `code` label to `synapse_http_server_response_time_seconds` prometheus metric ([\#3554](https://github.com/matrix-org/synapse/issues/3554))
- Add support for client_reader to handle more APIs ([\#3555](https://github.com/matrix-org/synapse/issues/3555), [\#3597](https://github.com/matrix-org/synapse/issues/3597))
- make the /context API filter & lazy-load aware as per MSC1227 ([\#3567](https://github.com/matrix-org/synapse/issues/3567))
- Add ability to limit number of monthly active users on the server ([\#3630](https://github.com/matrix-org/synapse/issues/3630))
- When we fail to join a room over federation, pass the error code back to the client. ([\#3639](https://github.com/matrix-org/synapse/issues/3639))
- Add a new /admin/register API for non-interactively creating users. ([\#3415](https://github.com/matrix-org/synapse/issues/3415))

Bugfixes
--------

- Make /directory/list API return 404 for room not found instead of 400 ([\#2952](https://github.com/matrix-org/synapse/issues/2952))
- Default inviter_display_name to mxid for email invites ([\#3391](https://github.com/matrix-org/synapse/issues/3391))
- Don't generate TURN credentials if no TURN config options are set ([\#3514](https://github.com/matrix-org/synapse/issues/3514))
- Correctly announce deleted devices over federation ([\#3520](https://github.com/matrix-org/synapse/issues/3520))
- Catch failures saving metrics captured by Measure, and instead log the faulty metrics information for further analysis. ([\#3548](https://github.com/matrix-org/synapse/issues/3548))
- Unicode passwords are now normalised before hashing, preventing the instance where two different devices or browsers might send a different UTF-8 sequence for the password.
([\#3569](https://github.com/matrix-org/synapse/issues/3569))
- Fix potential stack overflow and deadlock under heavy load ([\#3570](https://github.com/matrix-org/synapse/issues/3570))
- Respond with M_NOT_FOUND when profiles are not found locally or over federation. Fixes #3585 ([\#3585](https://github.com/matrix-org/synapse/issues/3585))
- Fix failure to persist events over federation under load ([\#3601](https://github.com/matrix-org/synapse/issues/3601))
- Fix updating of cached remote profiles ([\#3605](https://github.com/matrix-org/synapse/issues/3605))
- Fix 'tuple index out of range' error ([\#3607](https://github.com/matrix-org/synapse/issues/3607))
- Only import secrets when available (fix for py < 3.6) ([\#3626](https://github.com/matrix-org/synapse/issues/3626))

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

- Remove redundant checks on who_forgot_in_room ([\#3350](https://github.com/matrix-org/synapse/issues/3350))
- Remove unnecessary event re-signing hacks ([\#3367](https://github.com/matrix-org/synapse/issues/3367))
- Rewrite cache list decorator ([\#3384](https://github.com/matrix-org/synapse/issues/3384))
- Move v1-only REST APIs into their own module. ([\#3460](https://github.com/matrix-org/synapse/issues/3460))
- Replace more instances of Python 2-only iteritems and itervalues uses. ([\#3562](https://github.com/matrix-org/synapse/issues/3562))
- Refactor EventContext to accept state during init ([\#3577](https://github.com/matrix-org/synapse/issues/3577))
- Improve Dockerfile and docker-compose instructions ([\#3543](https://github.com/matrix-org/synapse/issues/3543))
- Release notes are now in the Markdown format. ([\#3552](https://github.com/matrix-org/synapse/issues/3552))
- add config for pep8 ([\#3559](https://github.com/matrix-org/synapse/issues/3559))
- Merge Linearizer and Limiter ([\#3571](https://github.com/matrix-org/synapse/issues/3571), [\#3572](https://github.com/matrix-org/synapse/issues/3572))
- Lazily load state on master process when using workers to reduce DB consumption ([\#3579](https://github.com/matrix-org/synapse/issues/3579),
[\#3581](https://github.com/matrix-org/synapse/issues/3581), [\#3582](https://github.com/matrix-org/synapse/issues/3582), [\#3584](https://github.com/matrix-org/synapse/issues/3584))
- Fixes and optimisations for resolve_state_groups ([\#3586](https://github.com/matrix-org/synapse/issues/3586))
- Improve logging for exceptions when handling PDUs ([\#3587](https://github.com/matrix-org/synapse/issues/3587))
- Add some measure blocks to persist_events ([\#3590](https://github.com/matrix-org/synapse/issues/3590))
- Fix some random logcontext leaks. ([\#3591](https://github.com/matrix-org/synapse/issues/3591), [\#3606](https://github.com/matrix-org/synapse/issues/3606))
- Speed up calculating state deltas in persist_event loop ([\#3592](https://github.com/matrix-org/synapse/issues/3592))
- Attempt to reduce amount of state pulled out of DB during persist_events ([\#3595](https://github.com/matrix-org/synapse/issues/3595))
- Fix a documentation typo in on_make_leave_request ([\#3609](https://github.com/matrix-org/synapse/issues/3609))
- Make EventStore inherit from EventFederationStore ([\#3612](https://github.com/matrix-org/synapse/issues/3612))
- Remove some redundant joins on event_edges.room_id ([\#3613](https://github.com/matrix-org/synapse/issues/3613))
- Stop populating events.content ([\#3614](https://github.com/matrix-org/synapse/issues/3614))
- Update the /send_leave path registration to use event_id rather than a transaction ID. ([\#3616](https://github.com/matrix-org/synapse/issues/3616))
- Refactor FederationHandler to move DB writes into separate functions ([\#3621](https://github.com/matrix-org/synapse/issues/3621))
- Remove unused field "pdu_failures" from transactions. ([\#3628](https://github.com/matrix-org/synapse/issues/3628))
- rename replication_layer to federation_client ([\#3634](https://github.com/matrix-org/synapse/issues/3634))
- Factor out exception handling in federation_client ([\#3638](https://github.com/matrix-org/synapse/issues/3638))
- Refactor location of docker build script. ([\#3644](https://github.com/matrix-org/synapse/issues/3644))
- Update CONTRIBUTING to mention newsfragments. ([\#3645](https://github.com/matrix-org/synapse/issues/3645))