Merge tag 'v1.51.0rc1' into develop

Synapse 1.51.0rc1 (2022-01-21)
==============================

Features
--------

- Add `track_puppeted_user_ips` config flag to record client IP addresses against puppeted users, and include the puppeted users in monthly active user counts. ([\#11561](https://github.com/matrix-org/synapse/issues/11561), [\#11749](https://github.com/matrix-org/synapse/issues/11749), [\#11757](https://github.com/matrix-org/synapse/issues/11757))
- Include whether the requesting user has participated in a thread when generating a summary for [MSC3440](https://github.com/matrix-org/matrix-doc/pull/3440). ([\#11577](https://github.com/matrix-org/synapse/issues/11577))
- Return an `M_FORBIDDEN` error code instead of `M_UNKNOWN` when a spam checker module prevents a user from creating a room. ([\#11672](https://github.com/matrix-org/synapse/issues/11672))
- Add a flag to the `synapse_review_recent_signups` script to ignore and filter appservice users. ([\#11675](https://github.com/matrix-org/synapse/issues/11675), [\#11770](https://github.com/matrix-org/synapse/issues/11770))

Bugfixes
--------

- Fix a long-standing issue which could cause Synapse to incorrectly accept data in the unsigned field of events
  received over federation. ([\#11530](https://github.com/matrix-org/synapse/issues/11530))
- Fix a long-standing bug where Synapse wouldn't cache a response indicating that a remote user has no devices. ([\#11587](https://github.com/matrix-org/synapse/issues/11587))
- Fix an error that occurs whilst trying to get the federation status of a destination server that was working normally. This admin API was newly introduced in Synapse v1.49.0. ([\#11593](https://github.com/matrix-org/synapse/issues/11593))
- Fix bundled aggregations not being included in the `/sync` response, per [MSC2675](https://github.com/matrix-org/matrix-doc/pull/2675). ([\#11612](https://github.com/matrix-org/synapse/issues/11612), [\#11659](https://github.com/matrix-org/synapse/issues/11659), [\#11791](https://github.com/matrix-org/synapse/issues/11791))
- Fix the `/_matrix/client/v1/room/{roomId}/hierarchy` endpoint returning incorrect fields which have been present since Synapse 1.49.0. ([\#11667](https://github.com/matrix-org/synapse/issues/11667))
- Fix preview of some GIF URLs (like tenor.com). Contributed by Philippe Daouadi. ([\#11669](https://github.com/matrix-org/synapse/issues/11669))
- Fix a bug where only the first 50 rooms from a space were returned from the `/hierarchy` API. This has existed since the introduction of the API in Synapse v1.41.0. ([\#11695](https://github.com/matrix-org/synapse/issues/11695))
- Fix a bug introduced in Synapse v1.18.0 where password reset and address validation emails would not be sent if their subject was configured to use the 'app' template variable. Contributed by @br4nnigan. ([\#11710](https://github.com/matrix-org/synapse/issues/11710), [\#11745](https://github.com/matrix-org/synapse/issues/11745))
- Make the 'List Rooms' Admin API sort stable. Contributed by Daniël Sonck. ([\#11737](https://github.com/matrix-org/synapse/issues/11737))
- Fix a long-standing bug where space hierarchy over federation would only work correctly some of the time. ([\#11775](https://github.com/matrix-org/synapse/issues/11775))
- Fix a bug introduced in Synapse v1.46.0 that prevented `on_logged_out` module callbacks from being correctly awaited by Synapse. ([\#11786](https://github.com/matrix-org/synapse/issues/11786))

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

- Warn against using a Let's Encrypt certificate for TLS/DTLS TURN server client connections, and suggest using ZeroSSL certificate instead. This works around client-side connectivity errors caused by WebRTC libraries that reject Let's Encrypt certificates. Contibuted by @AndrewFerr. ([\#11686](https://github.com/matrix-org/synapse/issues/11686))
- Document the new `SYNAPSE_TEST_PERSIST_SQLITE_DB` environment variable in the contributing guide. ([\#11715](https://github.com/matrix-org/synapse/issues/11715))
- Document that the minimum supported PostgreSQL version is now 10. ([\#11725](https://github.com/matrix-org/synapse/issues/11725))
- Fix typo in demo docs: differnt. ([\#11735](https://github.com/matrix-org/synapse/issues/11735))
- Update room spec URL in config files. ([\#11739](https://github.com/matrix-org/synapse/issues/11739))
- Mention `python3-venv` and `libpq-dev` dependencies in the contribution guide. ([\#11740](https://github.com/matrix-org/synapse/issues/11740))
- Update documentation for configuring login with Facebook. ([\#11755](https://github.com/matrix-org/synapse/issues/11755))
- Update installation instructions to note that Python 3.6 is no longer supported. ([\#11781](https://github.com/matrix-org/synapse/issues/11781))

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

- Remove the unstable `/send_relation` endpoint. ([\#11682](https://github.com/matrix-org/synapse/issues/11682))
- Remove `python_twisted_reactor_pending_calls` Prometheus metric. ([\#11724](https://github.com/matrix-org/synapse/issues/11724))
- Remove the `password_hash` field from the response dictionaries of the [Users Admin API](https://matrix-org.github.io/synapse/latest/admin_api/user_admin_api.html). ([\#11576](https://github.com/matrix-org/synapse/issues/11576))
- Deprecate support for `webclient` listeners and non-HTTP(S) `web_client_location` configuration. ([\#11774](https://github.com/matrix-org/synapse/issues/11774), [\#11783](https://github.com/matrix-org/synapse/issues/11783))

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

- Run `pyupgrade --py37-plus --keep-percent-format` on Synapse. ([\#11685](https://github.com/matrix-org/synapse/issues/11685))
- Use buildkit's cache feature to speed up docker builds. ([\#11691](https://github.com/matrix-org/synapse/issues/11691))
- Use `auto_attribs` and native type hints for attrs classes. ([\#11692](https://github.com/matrix-org/synapse/issues/11692), [\#11768](https://github.com/matrix-org/synapse/issues/11768))
- Remove debug logging for #4422, which has been closed since Synapse 0.99. ([\#11693](https://github.com/matrix-org/synapse/issues/11693))
- Remove fallback code for Python 2. ([\#11699](https://github.com/matrix-org/synapse/issues/11699))
- Add a test for [an edge case](https://github.com/matrix-org/synapse/pull/11532#discussion_r769104461) in the `/sync` logic. ([\#11701](https://github.com/matrix-org/synapse/issues/11701))
- Add the option to write SQLite test dbs to disk when running tests. ([\#11702](https://github.com/matrix-org/synapse/issues/11702))
- Improve Complement test output for Gitub Actions. ([\#11707](https://github.com/matrix-org/synapse/issues/11707))
- Fix docstring on `add_account_data_for_user`. ([\#11716](https://github.com/matrix-org/synapse/issues/11716))
- Complement environment variable name change and update `.gitignore`. ([\#11718](https://github.com/matrix-org/synapse/issues/11718))
- Simplify calculation of Prometheus metrics for garbage collection. ([\#11723](https://github.com/matrix-org/synapse/issues/11723))
- Improve accuracy of `python_twisted_reactor_tick_time` Prometheus metric. ([\#11724](https://github.com/matrix-org/synapse/issues/11724), [\#11771](https://github.com/matrix-org/synapse/issues/11771))
- Minor efficiency improvements when inserting many values into the database. ([\#11742](https://github.com/matrix-org/synapse/issues/11742))
- Invite PR authors to give themselves credit in the changelog. ([\#11744](https://github.com/matrix-org/synapse/issues/11744))
- Add optional debugging to investigate [issue 8631](https://github.com/matrix-org/synapse/issues/8631). ([\#11760](https://github.com/matrix-org/synapse/issues/11760))
- Remove `log_function` utility function and its uses. ([\#11761](https://github.com/matrix-org/synapse/issues/11761))
- Add a unit test that checks both `client` and `webclient` resources will function when simultaneously enabled. ([\#11765](https://github.com/matrix-org/synapse/issues/11765))
- Allow overriding complement commit using `COMPLEMENT_REF`. ([\#11766](https://github.com/matrix-org/synapse/issues/11766))
- Add some comments and type annotations for `_update_outliers_txn`. ([\#11776](https://github.com/matrix-org/synapse/issues/11776))

57 files changed, 82 insertions, 56 deletions

diff --git a/CHANGES.md b/CHANGES.md
index ced1dcc0db..ddf57f1494 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,78 @@
+Synapse 1.51.0rc1 (2022-01-21)
+==============================
+
+Features
+--------
+
+- Add `track_puppeted_user_ips` config flag to record client IP addresses against puppeted users, and include the puppeted users in monthly active user counts. ([\#11561](https://github.com/matrix-org/synapse/issues/11561), [\#11749](https://github.com/matrix-org/synapse/issues/11749), [\#11757](https://github.com/matrix-org/synapse/issues/11757))
+- Include whether the requesting user has participated in a thread when generating a summary for [MSC3440](https://github.com/matrix-org/matrix-doc/pull/3440). ([\#11577](https://github.com/matrix-org/synapse/issues/11577))
+- Return an `M_FORBIDDEN` error code instead of `M_UNKNOWN` when a spam checker module prevents a user from creating a room. ([\#11672](https://github.com/matrix-org/synapse/issues/11672))
+- Add a flag to the `synapse_review_recent_signups` script to ignore and filter appservice users. ([\#11675](https://github.com/matrix-org/synapse/issues/11675), [\#11770](https://github.com/matrix-org/synapse/issues/11770))
+
+
+Bugfixes
+--------
+
+- Fix a long-standing issue which could cause Synapse to incorrectly accept data in the unsigned field of events
+  received over federation. ([\#11530](https://github.com/matrix-org/synapse/issues/11530))
+- Fix a long-standing bug where Synapse wouldn't cache a response indicating that a remote user has no devices. ([\#11587](https://github.com/matrix-org/synapse/issues/11587))
+- Fix an error that occurs whilst trying to get the federation status of a destination server that was working normally. This admin API was newly introduced in Synapse v1.49.0. ([\#11593](https://github.com/matrix-org/synapse/issues/11593))
+- Fix bundled aggregations not being included in the `/sync` response, per [MSC2675](https://github.com/matrix-org/matrix-doc/pull/2675). ([\#11612](https://github.com/matrix-org/synapse/issues/11612), [\#11659](https://github.com/matrix-org/synapse/issues/11659), [\#11791](https://github.com/matrix-org/synapse/issues/11791))
+- Fix the `/_matrix/client/v1/room/{roomId}/hierarchy` endpoint returning incorrect fields which have been present since Synapse 1.49.0. ([\#11667](https://github.com/matrix-org/synapse/issues/11667))
+- Fix preview of some GIF URLs (like tenor.com). Contributed by Philippe Daouadi. ([\#11669](https://github.com/matrix-org/synapse/issues/11669))
+- Fix a bug where only the first 50 rooms from a space were returned from the `/hierarchy` API. This has existed since the introduction of the API in Synapse v1.41.0. ([\#11695](https://github.com/matrix-org/synapse/issues/11695))
+- Fix a bug introduced in Synapse v1.18.0 where password reset and address validation emails would not be sent if their subject was configured to use the 'app' template variable. Contributed by @br4nnigan. ([\#11710](https://github.com/matrix-org/synapse/issues/11710), [\#11745](https://github.com/matrix-org/synapse/issues/11745))
+- Make the 'List Rooms' Admin API sort stable. Contributed by Daniël Sonck. ([\#11737](https://github.com/matrix-org/synapse/issues/11737))
+- Fix a long-standing bug where space hierarchy over federation would only work correctly some of the time. ([\#11775](https://github.com/matrix-org/synapse/issues/11775))
+- Fix a bug introduced in Synapse v1.46.0 that prevented `on_logged_out` module callbacks from being correctly awaited by Synapse. ([\#11786](https://github.com/matrix-org/synapse/issues/11786))
+
+
+Improved Documentation
+----------------------
+
+- Warn against using a Let's Encrypt certificate for TLS/DTLS TURN server client connections, and suggest using ZeroSSL certificate instead. This works around client-side connectivity errors caused by WebRTC libraries that reject Let's Encrypt certificates. Contibuted by @AndrewFerr. ([\#11686](https://github.com/matrix-org/synapse/issues/11686))
+- Document the new `SYNAPSE_TEST_PERSIST_SQLITE_DB` environment variable in the contributing guide. ([\#11715](https://github.com/matrix-org/synapse/issues/11715))
+- Document that the minimum supported PostgreSQL version is now 10. ([\#11725](https://github.com/matrix-org/synapse/issues/11725))
+- Fix typo in demo docs: differnt. ([\#11735](https://github.com/matrix-org/synapse/issues/11735))
+- Update room spec URL in config files. ([\#11739](https://github.com/matrix-org/synapse/issues/11739))
+- Mention `python3-venv` and `libpq-dev` dependencies in the contribution guide. ([\#11740](https://github.com/matrix-org/synapse/issues/11740))
+- Update documentation for configuring login with Facebook. ([\#11755](https://github.com/matrix-org/synapse/issues/11755))
+- Update installation instructions to note that Python 3.6 is no longer supported. ([\#11781](https://github.com/matrix-org/synapse/issues/11781))
+
+
+Deprecations and Removals
+-------------------------
+
+- Remove the unstable `/send_relation` endpoint. ([\#11682](https://github.com/matrix-org/synapse/issues/11682))
+- Remove `python_twisted_reactor_pending_calls` Prometheus metric. ([\#11724](https://github.com/matrix-org/synapse/issues/11724))
+- Remove the `password_hash` field from the response dictionaries of the [Users Admin API](https://matrix-org.github.io/synapse/latest/admin_api/user_admin_api.html). ([\#11576](https://github.com/matrix-org/synapse/issues/11576))
+- Deprecate support for `webclient` listeners and non-HTTP(S) `web_client_location` configuration. ([\#11774](https://github.com/matrix-org/synapse/issues/11774), [\#11783](https://github.com/matrix-org/synapse/issues/11783))
+
+
+Internal Changes
+----------------
+
+- Run `pyupgrade --py37-plus --keep-percent-format` on Synapse. ([\#11685](https://github.com/matrix-org/synapse/issues/11685))
+- Use buildkit's cache feature to speed up docker builds. ([\#11691](https://github.com/matrix-org/synapse/issues/11691))
+- Use `auto_attribs` and native type hints for attrs classes. ([\#11692](https://github.com/matrix-org/synapse/issues/11692), [\#11768](https://github.com/matrix-org/synapse/issues/11768))
+- Remove debug logging for #4422, which has been closed since Synapse 0.99. ([\#11693](https://github.com/matrix-org/synapse/issues/11693))
+- Remove fallback code for Python 2. ([\#11699](https://github.com/matrix-org/synapse/issues/11699))
+- Add a test for [an edge case](https://github.com/matrix-org/synapse/pull/11532#discussion_r769104461) in the `/sync` logic. ([\#11701](https://github.com/matrix-org/synapse/issues/11701))
+- Add the option to write SQLite test dbs to disk when running tests. ([\#11702](https://github.com/matrix-org/synapse/issues/11702))
+- Improve Complement test output for Gitub Actions. ([\#11707](https://github.com/matrix-org/synapse/issues/11707))
+- Fix docstring on `add_account_data_for_user`. ([\#11716](https://github.com/matrix-org/synapse/issues/11716))
+- Complement environment variable name change and update `.gitignore`. ([\#11718](https://github.com/matrix-org/synapse/issues/11718))
+- Simplify calculation of Prometheus metrics for garbage collection. ([\#11723](https://github.com/matrix-org/synapse/issues/11723))
+- Improve accuracy of `python_twisted_reactor_tick_time` Prometheus metric. ([\#11724](https://github.com/matrix-org/synapse/issues/11724), [\#11771](https://github.com/matrix-org/synapse/issues/11771))
+- Minor efficiency improvements when inserting many values into the database. ([\#11742](https://github.com/matrix-org/synapse/issues/11742))
+- Invite PR authors to give themselves credit in the changelog. ([\#11744](https://github.com/matrix-org/synapse/issues/11744))
+- Add optional debugging to investigate [issue 8631](https://github.com/matrix-org/synapse/issues/8631). ([\#11760](https://github.com/matrix-org/synapse/issues/11760))
+- Remove `log_function` utility function and its uses. ([\#11761](https://github.com/matrix-org/synapse/issues/11761))
+- Add a unit test that checks both `client` and `webclient` resources will function when simultaneously enabled. ([\#11765](https://github.com/matrix-org/synapse/issues/11765))
+- Allow overriding complement commit using `COMPLEMENT_REF`. ([\#11766](https://github.com/matrix-org/synapse/issues/11766))
+- Add some comments and type annotations for `_update_outliers_txn`. ([\#11776](https://github.com/matrix-org/synapse/issues/11776))
+
+
 Synapse 1.50.1 (2022-01-18)
 ===========================
 
diff --git a/changelog.d/11530.bugfix b/changelog.d/11530.bugfix
deleted file mode 100644
index 7ea9ba4e49..0000000000
--- a/changelog.d/11530.bugfix
+++ /dev/null
@@ -1,2 +0,0 @@
-Fix a long-standing issue which could cause Synapse to incorrectly accept data in the unsigned field of events
-received over federation.
\ No newline at end of file
diff --git a/changelog.d/11561.feature b/changelog.d/11561.feature
deleted file mode 100644
index 3d4f2159c0..0000000000
--- a/changelog.d/11561.feature
+++ /dev/null
@@ -1 +0,0 @@
-Add `track_puppeted_user_ips` config flag to record client IP addresses against puppeted users, and include the puppeted users in monthly active user counts.
diff --git a/changelog.d/11576.feature b/changelog.d/11576.feature
deleted file mode 100644
index 5be836ae02..0000000000
--- a/changelog.d/11576.feature
+++ /dev/null
@@ -1 +0,0 @@
-Remove the `"password_hash"` field from the response dictionaries of the [Users Admin API](https://matrix-org.github.io/synapse/latest/admin_api/user_admin_api.html).
\ No newline at end of file
diff --git a/changelog.d/11577.feature b/changelog.d/11577.feature
deleted file mode 100644
index f9c8a0d5f4..0000000000
--- a/changelog.d/11577.feature
+++ /dev/null
@@ -1 +0,0 @@
-Include whether the requesting user has participated in a thread when generating a summary for [MSC3440](https://github.com/matrix-org/matrix-doc/pull/3440).
diff --git a/changelog.d/11587.bugfix b/changelog.d/11587.bugfix
deleted file mode 100644
index ad2b83edf7..0000000000
--- a/changelog.d/11587.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix a long-standing bug where Synapse wouldn't cache a response indicating that a remote user has no devices.
\ No newline at end of file
diff --git a/changelog.d/11593.bugfix b/changelog.d/11593.bugfix
deleted file mode 100644
index 963fd0e58e..0000000000
--- a/changelog.d/11593.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix an error in to get federation status of a destination server even if no error has occurred. This admin API was new introduced in Synapse 1.49.0.
diff --git a/changelog.d/11659.bugfix b/changelog.d/11659.bugfix
deleted file mode 100644
index 842f6892fd..0000000000
--- a/changelog.d/11659.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Include the bundled aggregations in the `/sync` response, per [MSC2675](https://github.com/matrix-org/matrix-doc/pull/2675).
diff --git a/changelog.d/11667.bugfix b/changelog.d/11667.bugfix
deleted file mode 100644
index bf65fd4c8b..0000000000
--- a/changelog.d/11667.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix `/_matrix/client/v1/room/{roomId}/hierarchy` endpoint returning incorrect fields which have been present since Synapse 1.49.0.
diff --git a/changelog.d/11669.bugfix b/changelog.d/11669.bugfix
deleted file mode 100644
index 10d913aace..0000000000
--- a/changelog.d/11669.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix preview of some gif URLs (like tenor.com). Contributed by Philippe Daouadi.
diff --git a/changelog.d/11672.feature b/changelog.d/11672.feature
deleted file mode 100644
index ce8b3e9547..0000000000
--- a/changelog.d/11672.feature
+++ /dev/null
@@ -1 +0,0 @@
-Return an `M_FORBIDDEN` error code instead of `M_UNKNOWN` when a spam checker module prevents a user from creating a room.
diff --git a/changelog.d/11675.feature b/changelog.d/11675.feature
deleted file mode 100644
index 9a276f9542..0000000000
--- a/changelog.d/11675.feature
+++ /dev/null
@@ -1 +0,0 @@
-Add a flag to the `synapse_review_recent_signups` script to ignore and filter appservice users.
diff --git a/changelog.d/11682.removal b/changelog.d/11682.removal
deleted file mode 100644
index 50bdf35b20..0000000000
--- a/changelog.d/11682.removal
+++ /dev/null
@@ -1 +0,0 @@
-Remove the unstable `/send_relation` endpoint.
diff --git a/changelog.d/11685.misc b/changelog.d/11685.misc
deleted file mode 100644
index c4566b2012..0000000000
--- a/changelog.d/11685.misc
+++ /dev/null
@@ -1 +0,0 @@
-Run `pyupgrade --py37-plus --keep-percent-format` on Synapse.
diff --git a/changelog.d/11686.doc b/changelog.d/11686.doc
deleted file mode 100644
index 41bc7799d4..0000000000
--- a/changelog.d/11686.doc
+++ /dev/null
@@ -1 +0,0 @@
-Warn against using a Let's Encrypt certificate for TLS/DTLS TURN server client connections, and suggest using ZeroSSL certificate instead. This bypasses client-side connectivity errors caused by WebRTC libraries that reject Let's Encrypt certificates. Contibuted by @AndrewFerr.
diff --git a/changelog.d/11691.misc b/changelog.d/11691.misc
deleted file mode 100644
index 383d0b3064..0000000000
--- a/changelog.d/11691.misc
+++ /dev/null
@@ -1 +0,0 @@
-Use buildkit's cache feature to speed up docker builds.
diff --git a/changelog.d/11692.misc b/changelog.d/11692.misc
deleted file mode 100644
index 0cdfca54e7..0000000000
--- a/changelog.d/11692.misc
+++ /dev/null
@@ -1 +0,0 @@
-Use `auto_attribs` and native type hints for attrs classes.
diff --git a/changelog.d/11693.misc b/changelog.d/11693.misc
deleted file mode 100644
index 521a1796b8..0000000000
--- a/changelog.d/11693.misc
+++ /dev/null
@@ -1 +0,0 @@
-Remove debug logging for #4422, which has been closed since Synapse 0.99.
\ No newline at end of file
diff --git a/changelog.d/11695.bugfix b/changelog.d/11695.bugfix
deleted file mode 100644
index 7799aefb82..0000000000
--- a/changelog.d/11695.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix a bug where the only the first 50 rooms from a space were returned from the `/hierarchy` API. This has existed since the introduction of the API in Synapse v1.41.0.
diff --git a/changelog.d/11699.misc b/changelog.d/11699.misc
deleted file mode 100644
index ffae5f2960..0000000000
--- a/changelog.d/11699.misc
+++ /dev/null
@@ -1 +0,0 @@
-Remove fallback code for Python 2.
diff --git a/changelog.d/11701.misc b/changelog.d/11701.misc
deleted file mode 100644
index 68905e0412..0000000000
--- a/changelog.d/11701.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add a test for [an edge case](https://github.com/matrix-org/synapse/pull/11532#discussion_r769104461) in the `/sync` logic.
\ No newline at end of file
diff --git a/changelog.d/11702.misc b/changelog.d/11702.misc
deleted file mode 100644
index fc1069cae0..0000000000
--- a/changelog.d/11702.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add the option to write sqlite test dbs to disk when running tests.
\ No newline at end of file
diff --git a/changelog.d/11707.misc b/changelog.d/11707.misc
deleted file mode 100644
index ef1e01cac8..0000000000
--- a/changelog.d/11707.misc
+++ /dev/null
@@ -1 +0,0 @@
-Improve Complement test output for Gitub Actions.
diff --git a/changelog.d/11710.bugfix b/changelog.d/11710.bugfix
deleted file mode 100644
index 6521a37f6e..0000000000
--- a/changelog.d/11710.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix a bug introduced in Synapse v1.18.0 where password reset and address validation emails would not be sent if their subject was configured to use the 'app' template variable. Contributed by @br4nnigan.
diff --git a/changelog.d/11714.misc b/changelog.d/11714.misc
deleted file mode 100644
index 7f39bf0e3d..0000000000
--- a/changelog.d/11714.misc
+++ /dev/null
@@ -1 +0,0 @@
-Fix a typechecker problem related to our (ab)use of `nacl.signing.SigningKey`s.
\ No newline at end of file
diff --git a/changelog.d/11715.doc b/changelog.d/11715.doc
deleted file mode 100644
index 32b7c10b0b..0000000000
--- a/changelog.d/11715.doc
+++ /dev/null
@@ -1 +0,0 @@
-Document the new `SYNAPSE_TEST_PERSIST_SQLITE_DB` environment variable in the contributing guide.
diff --git a/changelog.d/11716.misc b/changelog.d/11716.misc
deleted file mode 100644
index 08f7310498..0000000000
--- a/changelog.d/11716.misc
+++ /dev/null
@@ -1 +0,0 @@
-Fix docstring on `add_account_data_for_user`.
\ No newline at end of file
diff --git a/changelog.d/11718.misc b/changelog.d/11718.misc
deleted file mode 100644
index 91dc5b5874..0000000000
--- a/changelog.d/11718.misc
+++ /dev/null
@@ -1 +0,0 @@
-Complement environment variable name change and update `.gitignore`.
diff --git a/changelog.d/11723.misc b/changelog.d/11723.misc
deleted file mode 100644
index f99e02070a..0000000000
--- a/changelog.d/11723.misc
+++ /dev/null
@@ -1 +0,0 @@
-Simplify calculation of prometheus metrics for garbage collection.
diff --git a/changelog.d/11724.misc b/changelog.d/11724.misc
deleted file mode 100644
index e9d5dae857..0000000000
--- a/changelog.d/11724.misc
+++ /dev/null
@@ -1 +0,0 @@
-Improve accuracy of `python_twisted_reactor_tick_time` prometheus metric.
diff --git a/changelog.d/11724.removal b/changelog.d/11724.removal
deleted file mode 100644
index 088c3ff31f..0000000000
--- a/changelog.d/11724.removal
+++ /dev/null
@@ -1 +0,0 @@
-Remove `python_twisted_reactor_pending_calls` prometheus metric.
diff --git a/changelog.d/11725.doc b/changelog.d/11725.doc
deleted file mode 100644
index 46eb9b814f..0000000000
--- a/changelog.d/11725.doc
+++ /dev/null
@@ -1 +0,0 @@
-Document that now the minimum supported PostgreSQL version is 10.
diff --git a/changelog.d/11735.doc b/changelog.d/11735.doc
deleted file mode 100644
index d8822f6b52..0000000000
--- a/changelog.d/11735.doc
+++ /dev/null
@@ -1 +0,0 @@
-Fix typo in demo docs: differnt.
diff --git a/changelog.d/11737.bugfix b/changelog.d/11737.bugfix
deleted file mode 100644
index a293d1cfec..0000000000
--- a/changelog.d/11737.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Make the list rooms admin api sort stable. Contributed by Daniël Sonck.
\ No newline at end of file
diff --git a/changelog.d/11739.doc b/changelog.d/11739.doc
deleted file mode 100644
index 3d64f473f5..0000000000
--- a/changelog.d/11739.doc
+++ /dev/null
@@ -1 +0,0 @@
-Update room spec url in config files.
\ No newline at end of file
diff --git a/changelog.d/11740.doc b/changelog.d/11740.doc
deleted file mode 100644
index dce080a5e9..0000000000
--- a/changelog.d/11740.doc
+++ /dev/null
@@ -1 +0,0 @@
-Mention python3-venv and libpq-dev dependencies in contribution guide.
diff --git a/changelog.d/11742.misc b/changelog.d/11742.misc
deleted file mode 100644
index f65ccdf30a..0000000000
--- a/changelog.d/11742.misc
+++ /dev/null
@@ -1 +0,0 @@
-Minor efficiency improvements when inserting many values into the database.
diff --git a/changelog.d/11744.misc b/changelog.d/11744.misc
deleted file mode 100644
index b7df14657a..0000000000
--- a/changelog.d/11744.misc
+++ /dev/null
@@ -1 +0,0 @@
-Invite PR authors to give themselves credit in the changelog.
diff --git a/changelog.d/11745.bugfix b/changelog.d/11745.bugfix
deleted file mode 100644
index 6521a37f6e..0000000000
--- a/changelog.d/11745.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix a bug introduced in Synapse v1.18.0 where password reset and address validation emails would not be sent if their subject was configured to use the 'app' template variable. Contributed by @br4nnigan.
diff --git a/changelog.d/11749.feature b/changelog.d/11749.feature
deleted file mode 100644
index 3d4f2159c0..0000000000
--- a/changelog.d/11749.feature
+++ /dev/null
@@ -1 +0,0 @@
-Add `track_puppeted_user_ips` config flag to record client IP addresses against puppeted users, and include the puppeted users in monthly active user counts.
diff --git a/changelog.d/11755.doc b/changelog.d/11755.doc
deleted file mode 100644
index 5dd8feea63..0000000000
--- a/changelog.d/11755.doc
+++ /dev/null
@@ -1 +0,0 @@
-Update documentation for configuring login with facebook.
diff --git a/changelog.d/11757.feature b/changelog.d/11757.feature
deleted file mode 100644
index 3d4f2159c0..0000000000
--- a/changelog.d/11757.feature
+++ /dev/null
@@ -1 +0,0 @@
-Add `track_puppeted_user_ips` config flag to record client IP addresses against puppeted users, and include the puppeted users in monthly active user counts.
diff --git a/changelog.d/11760.misc b/changelog.d/11760.misc
deleted file mode 100644
index 6cb1b5dd49..0000000000
--- a/changelog.d/11760.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add optional debugging to investigate [issue 8631](https://github.com/matrix-org/synapse/issues/8631).
\ No newline at end of file
diff --git a/changelog.d/11761.misc b/changelog.d/11761.misc
deleted file mode 100644
index d4d997a7b9..0000000000
--- a/changelog.d/11761.misc
+++ /dev/null
@@ -1 +0,0 @@
-Remove `log_function` utility function and its uses.
diff --git a/changelog.d/11765.misc b/changelog.d/11765.misc
deleted file mode 100644
index a6c946e452..0000000000
--- a/changelog.d/11765.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add a unit test that checks both `client` and `webclient` resources will function when simultaneously enabled.
\ No newline at end of file
diff --git a/changelog.d/11766.misc b/changelog.d/11766.misc
deleted file mode 100644
index 3c9e5f95ff..0000000000
--- a/changelog.d/11766.misc
+++ /dev/null
@@ -1 +0,0 @@
-Allow overriding complement commit using `COMPLEMENT_REF`.
diff --git a/changelog.d/11768.misc b/changelog.d/11768.misc
deleted file mode 100644
index 1cac1f7446..0000000000
--- a/changelog.d/11768.misc
+++ /dev/null
@@ -1 +0,0 @@
-Use `auto_attribs` and native type hints for attrs classes.
\ No newline at end of file
diff --git a/changelog.d/11770.feature b/changelog.d/11770.feature
deleted file mode 100644
index 72777075cb..0000000000
--- a/changelog.d/11770.feature
+++ /dev/null
@@ -1 +0,0 @@
-Add a flag to the `synapse_review_recent_signups` script to ignore and filter appservice users.
\ No newline at end of file
diff --git a/changelog.d/11771.misc b/changelog.d/11771.misc
deleted file mode 100644
index e9d5dae857..0000000000
--- a/changelog.d/11771.misc
+++ /dev/null
@@ -1 +0,0 @@
-Improve accuracy of `python_twisted_reactor_tick_time` prometheus metric.
diff --git a/changelog.d/11774.misc b/changelog.d/11774.misc
deleted file mode 100644
index 136ba57f94..0000000000
--- a/changelog.d/11774.misc
+++ /dev/null
@@ -1 +0,0 @@
-Deprecate support for `webclient` listeners and non-HTTP(S) `web_client_location` configuration.
diff --git a/changelog.d/11775.bugfix b/changelog.d/11775.bugfix
deleted file mode 100644
index 2c548dbf30..0000000000
--- a/changelog.d/11775.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix a long-standing bug where space hierarchy over federation would only work correctly some of the time.
diff --git a/changelog.d/11776.misc b/changelog.d/11776.misc
deleted file mode 100644
index 572ccda847..0000000000
--- a/changelog.d/11776.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add some comments and type annotations for `_update_outliers_txn`.
diff --git a/changelog.d/11781.doc b/changelog.d/11781.doc
deleted file mode 100644
index b68e861d67..0000000000
--- a/changelog.d/11781.doc
+++ /dev/null
@@ -1 +0,0 @@
-Update installation instructions to note that Python 3.6 is no longer supported.
diff --git a/changelog.d/11783.misc b/changelog.d/11783.misc
deleted file mode 100644
index 136ba57f94..0000000000
--- a/changelog.d/11783.misc
+++ /dev/null
@@ -1 +0,0 @@
-Deprecate support for `webclient` listeners and non-HTTP(S) `web_client_location` configuration.
diff --git a/changelog.d/11786.bugfix b/changelog.d/11786.bugfix
deleted file mode 100644
index 306875f2dd..0000000000
--- a/changelog.d/11786.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix a bug introduced in Synapse 1.46.0 that prevented `on_logged_out` module callbacks from being correctly awaited by Synapse.
diff --git a/debian/changelog b/debian/changelog
index 18983f5da6..a013580e4f 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+matrix-synapse-py3 (1.51.0~rc1) stable; urgency=medium
+
+  * New synapse release 1.51.0~rc1.
+
+ -- Synapse Packaging team <packages@matrix.org>  Fri, 21 Jan 2022 10:46:02 +0000
+
 matrix-synapse-py3 (1.50.1) stable; urgency=medium
 
   * New synapse release 1.50.1.
diff --git a/synapse/__init__.py b/synapse/__init__.py
index 5ec9f94174..3d0d165f48 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -47,7 +47,7 @@ try:
 except ImportError:
     pass
 
-__version__ = "1.50.1"
+__version__ = "1.51.0rc1"
 
 if bool(os.environ.get("SYNAPSE_TEST_PATCH_LOG_CONTEXTS", False)):
     # We import here so that we don't have to install a bunch of deps when