Features
--------

- Add support for end-to-end key backup (MSC1687) ([\#4019](https://github.com/matrix-org/synapse/issues/4019))

Bugfixes
--------

- Fix bug in event persistence logic which caused 'NoneType is not iterable' ([\#3995](https://github.com/matrix-org/synapse/issues/3995))
- Fix exception in background metrics collection ([\#3996](https://github.com/matrix-org/synapse/issues/3996))
- Fix exception handling in fetching remote profiles ([\#3997](https://github.com/matrix-org/synapse/issues/3997))
- Fix handling of rejected threepid invites ([\#3999](https://github.com/matrix-org/synapse/issues/3999))
- Workers now start on Python 3. ([\#4027](https://github.com/matrix-org/synapse/issues/4027))
- Synapse now starts on Python 3.7. ([\#4033](https://github.com/matrix-org/synapse/issues/4033))

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

- Log exceptions in looping calls ([\#4008](https://github.com/matrix-org/synapse/issues/4008))
- Optimisation for serving federation requests ([\#4017](https://github.com/matrix-org/synapse/issues/4017))
- Add metric to count number of non-empty sync responses ([\#4022](https://github.com/matrix-org/synapse/issues/4022))

Features
--------

- Adding the ability to change MAX_UPLOAD_SIZE for the docker container
variables. ([\#3883](https://github.com/matrix-org/synapse/issues/3883))
- Report "python_version" in the phone home stats
([\#3894](https://github.com/matrix-org/synapse/issues/3894))
- Always LL ourselves if we're in a room
([\#3916](https://github.com/matrix-org/synapse/issues/3916))
- Include eventid in log lines when processing incoming federation
transactions
([\#3959](https://github.com/matrix-org/synapse/issues/3959))
- Remove spurious check which made 'localhost' servers not work
([\#3964](https://github.com/matrix-org/synapse/issues/3964))

Bugfixes
--------

- Fix problem when playing media from Chrome using direct URL (thanks
@remjey!) ([\#3578](https://github.com/matrix-org/synapse/issues/3578))
- support registering regular users non-interactively with
register_new_matrix_user script
([\#3836](https://github.com/matrix-org/synapse/issues/3836))
- Fix broken invite email links for self hosted riots
([\#3868](https://github.com/matrix-org/synapse/issues/3868))
- Don't ratelimit autojoins
([\#3879](https://github.com/matrix-org/synapse/issues/3879))
- Fix 500 error when deleting unknown room alias
([\#3889](https://github.com/matrix-org/synapse/issues/3889))
- Fix some b'abcd' noise in logs and metrics
([\#3892](https://github.com/matrix-org/synapse/issues/3892),
[\#3895](https://github.com/matrix-org/synapse/issues/3895))
- When we join a room, always try the server we used for the alias
lookup first, to avoid unresponsive and out-of-date servers.
([\#3899](https://github.com/matrix-org/synapse/issues/3899))
- Fix incorrect server-name indication for outgoing federation requests
([\#3907](https://github.com/matrix-org/synapse/issues/3907))
- Fix adding client IPs to the database failing on Python 3.
([\#3908](https://github.com/matrix-org/synapse/issues/3908))
- Fix bug where things occaisonally were not being timed out correctly.
([\#3910](https://github.com/matrix-org/synapse/issues/3910))
- Fix bug where outbound federation would stop talking to some servers
when using workers
([\#3914](https://github.com/matrix-org/synapse/issues/3914))
- Fix some instances of ExpiringCache not expiring cache items
([\#3932](https://github.com/matrix-org/synapse/issues/3932),
[\#3980](https://github.com/matrix-org/synapse/issues/3980))
- Fix out-of-bounds error when LLing yourself
([\#3936](https://github.com/matrix-org/synapse/issues/3936))
- Sending server notices regarding user consent now works on Python 3.
([\#3938](https://github.com/matrix-org/synapse/issues/3938))
- Fix exceptions from metrics handler
([\#3956](https://github.com/matrix-org/synapse/issues/3956))
- Fix error message for events with m.room.create missing from
auth_events
([\#3960](https://github.com/matrix-org/synapse/issues/3960))
- Fix errors due to concurrent monthly_active_user upserts
([\#3961](https://github.com/matrix-org/synapse/issues/3961))
- Fix exceptions when processing incoming events over federation
([\#3968](https://github.com/matrix-org/synapse/issues/3968))
- Replaced all occurences of e.message with str(e). Contributed by
Schnuffle ([\#3970](https://github.com/matrix-org/synapse/issues/3970))
- Fix lazy loaded sync in the presence of rejected state events
([\#3986](https://github.com/matrix-org/synapse/issues/3986))
- Fix error when logging incomplete HTTP requests
([\#3990](https://github.com/matrix-org/synapse/issues/3990))

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

- Unit tests can now be run under PostgreSQL in Docker using
``test_postgresql.sh``.
([\#3699](https://github.com/matrix-org/synapse/issues/3699))
- Speed up calculation of typing updates for replication
([\#3794](https://github.com/matrix-org/synapse/issues/3794))
- Remove documentation regarding installation on Cygwin, the use of WSL
is recommended instead.
([\#3873](https://github.com/matrix-org/synapse/issues/3873))
- Fix typo in README, synaspse -> synapse
([\#3897](https://github.com/matrix-org/synapse/issues/3897))
- Increase the timeout when filling missing events in federation
requests ([\#3903](https://github.com/matrix-org/synapse/issues/3903))
- Improve the logging when handling a federation transaction
([\#3904](https://github.com/matrix-org/synapse/issues/3904),
[\#3966](https://github.com/matrix-org/synapse/issues/3966))
- Improve logging of outbound federation requests
([\#3906](https://github.com/matrix-org/synapse/issues/3906),
[\#3909](https://github.com/matrix-org/synapse/issues/3909))
- Fix the docker image building on python 3
([\#3911](https://github.com/matrix-org/synapse/issues/3911))
- Add a regression test for logging failed HTTP requests on Python 3.
([\#3912](https://github.com/matrix-org/synapse/issues/3912))
- Comments and interface cleanup for on_receive_pdu
([\#3924](https://github.com/matrix-org/synapse/issues/3924))
- Fix spurious exceptions when remote http client closes conncetion
([\#3925](https://github.com/matrix-org/synapse/issues/3925))
- Log exceptions thrown by background tasks
([\#3927](https://github.com/matrix-org/synapse/issues/3927))
- Add a cache to get_destination_retry_timings
([\#3933](https://github.com/matrix-org/synapse/issues/3933),
[\#3991](https://github.com/matrix-org/synapse/issues/3991))
- Automate pushes to docker hub
([\#3946](https://github.com/matrix-org/synapse/issues/3946))
- Require attrs 16.0.0 or later
([\#3947](https://github.com/matrix-org/synapse/issues/3947))
- Fix incompatibility with python3 on alpine
([\#3948](https://github.com/matrix-org/synapse/issues/3948))
- Run the test suite on the oldest supported versions of our
dependencies in CI.
([\#3952](https://github.com/matrix-org/synapse/issues/3952))
- CircleCI now only runs merged jobs on PRs, and commit jobs on develop,
master, and release branches.
([\#3957](https://github.com/matrix-org/synapse/issues/3957))
- Fix docstrings and add tests for state store methods
([\#3958](https://github.com/matrix-org/synapse/issues/3958))
- fix docstring for FederationClient.get_state_for_room
([\#3963](https://github.com/matrix-org/synapse/issues/3963))
- Run notify_app_services as a bg process
([\#3965](https://github.com/matrix-org/synapse/issues/3965))
- Clarifications in FederationHandler
([\#3967](https://github.com/matrix-org/synapse/issues/3967))
- Further reduce the docker image size
([\#3972](https://github.com/matrix-org/synapse/issues/3972))
- Build py3 docker images for docker hub too
([\#3976](https://github.com/matrix-org/synapse/issues/3976))
- Updated the installation instructions to point to the matrix-synapse
package on PyPI.
([\#3985](https://github.com/matrix-org/synapse/issues/3985))
- Disable USE_FROZEN_DICTS for unittests by default.
([\#3987](https://github.com/matrix-org/synapse/issues/3987))
- Remove unused Jenkins and development related files from the repo.
([\#3988](https://github.com/matrix-org/synapse/issues/3988))
- Improve stacktraces in certain exceptions in the logs
([\#3989](https://github.com/matrix-org/synapse/issues/3989))
- Pin to prometheus_client<0.4 to avoid renaming all of our metrics
([\#4002](https://github.com/matrix-org/synapse/issues/4002))

Features
--------

- Adding the ability to change MAX_UPLOAD_SIZE for the docker container variables. ([\#3883](https://github.com/matrix-org/synapse/issues/3883))
- Report "python_version" in the phone home stats ([\#3894](https://github.com/matrix-org/synapse/issues/3894))
- Always LL ourselves if we're in a room ([\#3916](https://github.com/matrix-org/synapse/issues/3916))
- Include eventid in log lines when processing incoming federation transactions ([\#3959](https://github.com/matrix-org/synapse/issues/3959))
- Remove spurious check which made 'localhost' servers not work ([\#3964](https://github.com/matrix-org/synapse/issues/3964))

Bugfixes
--------

- Fix problem when playing media from Chrome using direct URL (thanks @remjey!) ([\#3578](https://github.com/matrix-org/synapse/issues/3578))
- support registering regular users non-interactively with register_new_matrix_user script ([\#3836](https://github.com/matrix-org/synapse/issues/3836))
- Fix broken invite email links for self hosted riots ([\#3868](https://github.com/matrix-org/synapse/issues/3868))
- Don't ratelimit autojoins ([\#3879](https://github.com/matrix-org/synapse/issues/3879))
- Fix 500 error when deleting unknown room alias ([\#3889](https://github.com/matrix-org/synapse/issues/3889))
- Fix some b'abcd' noise in logs and metrics ([\#3892](https://github.com/matrix-org/synapse/issues/3892), [\#3895](https://github.com/matrix-org/synapse/issues/3895))
- When we join a room, always try the server we used for the alias lookup first, to avoid unresponsive and out-of-date servers. ([\#3899](https://github.com/matrix-org/synapse/issues/3899))
- Fix incorrect server-name indication for outgoing federation requests ([\#3907](https://github.com/matrix-org/synapse/issues/3907))
- Fix adding client IPs to the database failing on Python 3. ([\#3908](https://github.com/matrix-org/synapse/issues/3908))
- Fix bug where things occaisonally were not being timed out correctly. ([\#3910](https://github.com/matrix-org/synapse/issues/3910))
- Fix bug where outbound federation would stop talking to some servers when using workers ([\#3914](https://github.com/matrix-org/synapse/issues/3914))
- Fix some instances of ExpiringCache not expiring cache items ([\#3932](https://github.com/matrix-org/synapse/issues/3932), [\#3980](https://github.com/matrix-org/synapse/issues/3980))
- Fix out-of-bounds error when LLing yourself ([\#3936](https://github.com/matrix-org/synapse/issues/3936))
- Sending server notices regarding user consent now works on Python 3. ([\#3938](https://github.com/matrix-org/synapse/issues/3938))
- Fix exceptions from metrics handler ([\#3956](https://github.com/matrix-org/synapse/issues/3956))
- Fix error message for events with m.room.create missing from auth_events ([\#3960](https://github.com/matrix-org/synapse/issues/3960))
- Fix errors due to concurrent monthly_active_user upserts ([\#3961](https://github.com/matrix-org/synapse/issues/3961))
- Fix exceptions when processing incoming events over federation ([\#3968](https://github.com/matrix-org/synapse/issues/3968))
- Replaced all occurences of e.message with str(e). Contributed by Schnuffle ([\#3970](https://github.com/matrix-org/synapse/issues/3970))
- Fix lazy loaded sync in the presence of rejected state events ([\#3986](https://github.com/matrix-org/synapse/issues/3986))
- Fix error when logging incomplete HTTP requests ([\#3990](https://github.com/matrix-org/synapse/issues/3990))
- Add a cache to get_destination_retry_timings ([\#3991](https://github.com/matrix-org/synapse/issues/3991))

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

- Unit tests can now be run under PostgreSQL in Docker using
  ``test_postgresql.sh``. ([\#3699](https://github.com/matrix-org/synapse/issues/3699))
- Speed up calculation of typing updates for replication ([\#3794](https://github.com/matrix-org/synapse/issues/3794))
- Remove documentation regarding installation on Cygwin, the use of WSL is
  recommended instead. ([\#3873](https://github.com/matrix-org/synapse/issues/3873))
- Fix typo in README, synaspse -> synapse ([\#3897](https://github.com/matrix-org/synapse/issues/3897))
- Increase the timeout when filling missing events in federation requests ([\#3903](https://github.com/matrix-org/synapse/issues/3903))
- Improve the logging when handling a federation transaction ([\#3904](https://github.com/matrix-org/synapse/issues/3904), [\#3966](https://github.com/matrix-org/synapse/issues/3966))
- Improve logging of outbound federation requests ([\#3906](https://github.com/matrix-org/synapse/issues/3906), [\#3909](https://github.com/matrix-org/synapse/issues/3909))
- Fix the docker image building on python 3 ([\#3911](https://github.com/matrix-org/synapse/issues/3911))
- Add a regression test for logging failed HTTP requests on Python 3. ([\#3912](https://github.com/matrix-org/synapse/issues/3912))
- Comments and interface cleanup for on_receive_pdu ([\#3924](https://github.com/matrix-org/synapse/issues/3924))
- Fix spurious exceptions when remote http client closes conncetion ([\#3925](https://github.com/matrix-org/synapse/issues/3925))
- Log exceptions thrown by background tasks ([\#3927](https://github.com/matrix-org/synapse/issues/3927))
- Add a cache to get_destination_retry_timings ([\#3933](https://github.com/matrix-org/synapse/issues/3933))
- Automate pushes to docker hub ([\#3946](https://github.com/matrix-org/synapse/issues/3946))
- Require attrs 16.0.0 or later ([\#3947](https://github.com/matrix-org/synapse/issues/3947))
- Fix incompatibility with python3 on alpine ([\#3948](https://github.com/matrix-org/synapse/issues/3948))
- Run the test suite on the oldest supported versions of our dependencies in CI. ([\#3952](https://github.com/matrix-org/synapse/issues/3952))
- CircleCI now only runs merged jobs on PRs, and commit jobs on develop, master, and release branches. ([\#3957](https://github.com/matrix-org/synapse/issues/3957))
- Fix docstrings and add tests for state store methods ([\#3958](https://github.com/matrix-org/synapse/issues/3958))
- fix docstring for FederationClient.get_state_for_room ([\#3963](https://github.com/matrix-org/synapse/issues/3963))
- Run notify_app_services as a bg process ([\#3965](https://github.com/matrix-org/synapse/issues/3965))
- Clarifications in FederationHandler ([\#3967](https://github.com/matrix-org/synapse/issues/3967))
- Further reduce the docker image size ([\#3972](https://github.com/matrix-org/synapse/issues/3972))
- Build py3 docker images for docker hub too ([\#3976](https://github.com/matrix-org/synapse/issues/3976))
- Updated the installation instructions to point to the matrix-synapse package on PyPI. ([\#3985](https://github.com/matrix-org/synapse/issues/3985))
- Disable USE_FROZEN_DICTS for unittests by default. ([\#3987](https://github.com/matrix-org/synapse/issues/3987))
- Remove unused Jenkins and development related files from the repo. ([\#3988](https://github.com/matrix-org/synapse/issues/3988))
- Improve stacktraces in certain exceptions in the logs ([\#3989](https://github.com/matrix-org/synapse/issues/3989))

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))