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))
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