From d1130a249b4f462a3e457b783b483d5a6c7486f0 Mon Sep 17 00:00:00 2001
From: David Robertson <davidr@element.io>
Date: Tue, 15 Mar 2022 11:00:01 +0000
Subject: [PATCH] 1.55.0rc1

---
 CHANGES.md                | 82 +++++++++++++++++++++++++++++++++++++++
 changelog.d/11700.removal |  1 -
 changelog.d/11915.misc    |  1 -
 changelog.d/11980.misc    |  1 -
 changelog.d/11998.doc     |  1 -
 changelog.d/12028.feature |  1 -
 changelog.d/12042.misc    |  1 -
 changelog.d/12090.bugfix  |  1 -
 changelog.d/12101.misc    |  1 -
 changelog.d/12108.misc    |  1 -
 changelog.d/12113.bugfix  |  1 -
 changelog.d/12118.misc    |  1 -
 changelog.d/12120.misc    |  1 -
 changelog.d/12121.bugfix  |  1 -
 changelog.d/12128.misc    |  1 -
 changelog.d/12130.bugfix  |  1 -
 changelog.d/12131.misc    |  1 -
 changelog.d/12132.feature |  1 -
 changelog.d/12135.feature |  1 -
 changelog.d/12136.misc    |  1 -
 changelog.d/12137.misc    |  1 -
 changelog.d/12138.removal |  1 -
 changelog.d/12140.misc    |  1 -
 changelog.d/12142.misc    |  1 -
 changelog.d/12143.doc     |  1 -
 changelog.d/12144.misc    |  1 -
 changelog.d/12145.misc    |  1 -
 changelog.d/12146.misc    |  1 -
 changelog.d/12149.misc    |  1 -
 changelog.d/12150.misc    |  1 -
 changelog.d/12151.feature |  1 -
 changelog.d/12152.misc    |  1 -
 changelog.d/12153.misc    |  1 -
 changelog.d/12154.misc    |  1 -
 changelog.d/12155.misc    |  1 -
 changelog.d/12156.misc    |  1 -
 changelog.d/12157.bugfix  |  1 -
 changelog.d/12159.misc    |  1 -
 changelog.d/12161.misc    |  1 -
 changelog.d/12163.misc    |  1 -
 changelog.d/12173.misc    |  1 -
 changelog.d/12175.bugfix  |  1 -
 changelog.d/12179.doc     |  1 -
 changelog.d/12180.misc    |  1 -
 changelog.d/12182.misc    |  1 -
 changelog.d/12183.misc    |  1 -
 changelog.d/12187.misc    |  1 -
 changelog.d/12188.misc    |  1 -
 changelog.d/12189.bugfix  |  1 -
 changelog.d/12192.misc    |  1 -
 changelog.d/12196.doc     |  1 -
 changelog.d/12197.misc    |  1 -
 changelog.d/12200.removal |  1 -
 changelog.d/12202.misc    |  1 -
 changelog.d/12203.misc    |  1 -
 changelog.d/12204.doc     |  1 -
 changelog.d/12206.misc    |  1 -
 changelog.d/12207.misc    |  1 -
 changelog.d/12208.misc    |  1 -
 changelog.d/12210.misc    |  1 -
 changelog.d/12211.misc    |  1 -
 changelog.d/12212.feature |  1 -
 changelog.d/12215.bugfix  |  1 -
 debian/changelog          |  6 +++
 synapse/__init__.py       |  2 +-
 65 files changed, 89 insertions(+), 63 deletions(-)
 delete mode 100644 changelog.d/11700.removal
 delete mode 100644 changelog.d/11915.misc
 delete mode 100644 changelog.d/11980.misc
 delete mode 100644 changelog.d/11998.doc
 delete mode 100644 changelog.d/12028.feature
 delete mode 100644 changelog.d/12042.misc
 delete mode 100644 changelog.d/12090.bugfix
 delete mode 100644 changelog.d/12101.misc
 delete mode 100644 changelog.d/12108.misc
 delete mode 100644 changelog.d/12113.bugfix
 delete mode 100644 changelog.d/12118.misc
 delete mode 100644 changelog.d/12120.misc
 delete mode 100644 changelog.d/12121.bugfix
 delete mode 100644 changelog.d/12128.misc
 delete mode 100644 changelog.d/12130.bugfix
 delete mode 100644 changelog.d/12131.misc
 delete mode 100644 changelog.d/12132.feature
 delete mode 100644 changelog.d/12135.feature
 delete mode 100644 changelog.d/12136.misc
 delete mode 100644 changelog.d/12137.misc
 delete mode 100644 changelog.d/12138.removal
 delete mode 100644 changelog.d/12140.misc
 delete mode 100644 changelog.d/12142.misc
 delete mode 100644 changelog.d/12143.doc
 delete mode 100644 changelog.d/12144.misc
 delete mode 100644 changelog.d/12145.misc
 delete mode 100644 changelog.d/12146.misc
 delete mode 100644 changelog.d/12149.misc
 delete mode 100644 changelog.d/12150.misc
 delete mode 100644 changelog.d/12151.feature
 delete mode 100644 changelog.d/12152.misc
 delete mode 100644 changelog.d/12153.misc
 delete mode 100644 changelog.d/12154.misc
 delete mode 100644 changelog.d/12155.misc
 delete mode 100644 changelog.d/12156.misc
 delete mode 100644 changelog.d/12157.bugfix
 delete mode 100644 changelog.d/12159.misc
 delete mode 100644 changelog.d/12161.misc
 delete mode 100644 changelog.d/12163.misc
 delete mode 100644 changelog.d/12173.misc
 delete mode 100644 changelog.d/12175.bugfix
 delete mode 100644 changelog.d/12179.doc
 delete mode 100644 changelog.d/12180.misc
 delete mode 100644 changelog.d/12182.misc
 delete mode 100644 changelog.d/12183.misc
 delete mode 100644 changelog.d/12187.misc
 delete mode 100644 changelog.d/12188.misc
 delete mode 100644 changelog.d/12189.bugfix
 delete mode 100644 changelog.d/12192.misc
 delete mode 100644 changelog.d/12196.doc
 delete mode 100644 changelog.d/12197.misc
 delete mode 100644 changelog.d/12200.removal
 delete mode 100644 changelog.d/12202.misc
 delete mode 100644 changelog.d/12203.misc
 delete mode 100644 changelog.d/12204.doc
 delete mode 100644 changelog.d/12206.misc
 delete mode 100644 changelog.d/12207.misc
 delete mode 100644 changelog.d/12208.misc
 delete mode 100644 changelog.d/12210.misc
 delete mode 100644 changelog.d/12211.misc
 delete mode 100644 changelog.d/12212.feature
 delete mode 100644 changelog.d/12215.bugfix

diff --git a/CHANGES.md b/CHANGES.md
index ef671e73f..b0311f73b 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,85 @@
+Synapse 1.55.0rc1 (2022-03-15)
+==============================
+
+Features
+--------
+
+- Add third-party rules rules callbacks `check_can_shutdown_room` and `check_can_deactivate_user`. ([\#12028](https://github.com/matrix-org/synapse/issues/12028))
+- Improve performance of logging in for large accounts. ([\#12132](https://github.com/matrix-org/synapse/issues/12132))
+- Add experimental env var `SYNAPSE_ASYNC_IO_REACTOR` that causes Synapse to use the asyncio reactor for Twisted. ([\#12135](https://github.com/matrix-org/synapse/issues/12135))
+- Support the stable identifiers from [MSC3440](https://github.com/matrix-org/matrix-doc/pull/3440): threads. ([\#12151](https://github.com/matrix-org/synapse/issues/12151))
+- Add a new Jinja2 template filter to extract the local part of an email address. ([\#12212](https://github.com/matrix-org/synapse/issues/12212))
+
+
+Bugfixes
+--------
+
+- Use the proper serialization format for bundled thread aggregations. The bug has existed since Synapse v1.48.0. ([\#12090](https://github.com/matrix-org/synapse/issues/12090))
+- Fix a long-standing bug when redacting events with relations. ([\#12113](https://github.com/matrix-org/synapse/issues/12113), [\#12121](https://github.com/matrix-org/synapse/issues/12121), [\#12130](https://github.com/matrix-org/synapse/issues/12130), [\#12189](https://github.com/matrix-org/synapse/issues/12189))
+- Fix a bug introduced in #4864 whereby background updates are never run with the default background batch size. ([\#12157](https://github.com/matrix-org/synapse/issues/12157))
+- Fix a bug where non-standard information was returned from the `/hierarchy` API. Introduced in Synapse v1.41.0. ([\#12175](https://github.com/matrix-org/synapse/issues/12175))
+- Fix a bug introduced in 1.54.0 that broke background updates on sqlite homeservers while search was disabled. ([\#12215](https://github.com/matrix-org/synapse/issues/12215))
+
+
+Improved Documentation
+----------------------
+
+- Fix complexity checking config example in [Resource Constrained Devices](https://matrix-org.github.io/synapse/v1.54/other/running_synapse_on_single_board_computers.html) docs page. ([\#11998](https://github.com/matrix-org/synapse/issues/11998))
+- Improve documentation for demo scripts. ([\#12143](https://github.com/matrix-org/synapse/issues/12143))
+- Updates to the Room DAG concepts development document. ([\#12179](https://github.com/matrix-org/synapse/issues/12179))
+- Document that the `typing`, `to_device`, `account_data`, `receipts`, and `presence` stream writer can only be used on a single worker. ([\#12196](https://github.com/matrix-org/synapse/issues/12196))
+- Document that contributors can sign off privately by email. ([\#12204](https://github.com/matrix-org/synapse/issues/12204))
+
+
+Deprecations and Removals
+-------------------------
+
+- Remove workaround introduced in Synapse 1.50.0 for Mjolnir compatibility. Breaks compatibility with Mjolnir 1.3.1 and earlier. ([\#11700](https://github.com/matrix-org/synapse/issues/11700))
+- Remove backwards compatibilty with pagination tokens from the `/relations` and `/aggregations` endpoints generated from Synapse < v1.52.0. ([\#12138](https://github.com/matrix-org/synapse/issues/12138))
+- The groups/communities feature in Synapse has been deprecated. ([\#12200](https://github.com/matrix-org/synapse/issues/12200))
+
+
+Internal Changes
+----------------
+
+- Simplify the `ApplicationService` class' set of public methods related to interest checking. ([\#11915](https://github.com/matrix-org/synapse/issues/11915))
+- Add config settings for background update parameters. ([\#11980](https://github.com/matrix-org/synapse/issues/11980))
+- Correct type hints for txredis. ([\#12042](https://github.com/matrix-org/synapse/issues/12042))
+- Limit the size of `aggregation_key` on annotations. ([\#12101](https://github.com/matrix-org/synapse/issues/12101))
+- Add type hints to tests files. ([\#12108](https://github.com/matrix-org/synapse/issues/12108), [\#12146](https://github.com/matrix-org/synapse/issues/12146), [\#12207](https://github.com/matrix-org/synapse/issues/12207), [\#12208](https://github.com/matrix-org/synapse/issues/12208))
+- Move scripts to Synapse package and expose as setuptools entry points. ([\#12118](https://github.com/matrix-org/synapse/issues/12118))
+- Add support for cancellation to `ReadWriteLock`. ([\#12120](https://github.com/matrix-org/synapse/issues/12120))
+- Fix data validation to compare to lists, not sequences. ([\#12128](https://github.com/matrix-org/synapse/issues/12128))
+- Fix CI not attaching source distributions and wheels to the GitHub releases. ([\#12131](https://github.com/matrix-org/synapse/issues/12131))
+- Remove unused mocks from `test_typing`. ([\#12136](https://github.com/matrix-org/synapse/issues/12136))
+- Give `scripts-dev` scripts suffixes for neater CI config. ([\#12137](https://github.com/matrix-org/synapse/issues/12137))
+- Move `synctl` into `synapse._scripts` and expose as an entry point. ([\#12140](https://github.com/matrix-org/synapse/issues/12140))
+- Move the snapcraft configuration file to `contrib`. ([\#12142](https://github.com/matrix-org/synapse/issues/12142))
+- Enable [MSC3030](https://github.com/matrix-org/matrix-doc/pull/3030) Complement tests in CI. ([\#12144](https://github.com/matrix-org/synapse/issues/12144))
+- Enable [MSC2716](https://github.com/matrix-org/matrix-doc/pull/2716) Complement tests in CI. ([\#12145](https://github.com/matrix-org/synapse/issues/12145))
+- Add test for `ObservableDeferred`'s cancellation behaviour. ([\#12149](https://github.com/matrix-org/synapse/issues/12149))
+- Use `ParamSpec` in type hints for `synapse.logging.context`. ([\#12150](https://github.com/matrix-org/synapse/issues/12150))
+- Prune unused jobs from `tox` config. ([\#12152](https://github.com/matrix-org/synapse/issues/12152))
+- Move CI checks out of tox, to facilitate a move to using poetry. ([\#12153](https://github.com/matrix-org/synapse/issues/12153))
+- Avoid generating state groups for local out-of-band leaves. ([\#12154](https://github.com/matrix-org/synapse/issues/12154))
+- Avoid trying to calculate the state at outlier events. ([\#12155](https://github.com/matrix-org/synapse/issues/12155), [\#12173](https://github.com/matrix-org/synapse/issues/12173), [\#12202](https://github.com/matrix-org/synapse/issues/12202))
+- Fix some type annotations. ([\#12156](https://github.com/matrix-org/synapse/issues/12156))
+- Add type hints for `ObservableDeferred` attributes. ([\#12159](https://github.com/matrix-org/synapse/issues/12159))
+- Use a prebuilt Action for the `tests-done` CI job. ([\#12161](https://github.com/matrix-org/synapse/issues/12161))
+- Reduce number of DB queries made during processing of `/sync`. ([\#12163](https://github.com/matrix-org/synapse/issues/12163))
+- Add `delay_cancellation` utility function, which behaves like `stop_cancellation` but waits until the original `Deferred` resolves before raising a `CancelledError`. ([\#12180](https://github.com/matrix-org/synapse/issues/12180))
+- Retry HTTP replication failures, this should prevent 502's when restarting stateful workers (main, event persisters, stream writers). Contributed by Nick @ Beeper. ([\#12182](https://github.com/matrix-org/synapse/issues/12182))
+- Add cancellation support to `@cached` and `@cachedList` decorators. ([\#12183](https://github.com/matrix-org/synapse/issues/12183))
+- Remove unused variables. ([\#12187](https://github.com/matrix-org/synapse/issues/12187))
+- Add combined test for HTTP pusher and push rule. Contributed by Nick @ Beeper. ([\#12188](https://github.com/matrix-org/synapse/issues/12188))
+- Rename `HomeServer.get_tcp_replication` to `get_replication_command_handler`. ([\#12192](https://github.com/matrix-org/synapse/issues/12192))
+- Remove some dead code. ([\#12197](https://github.com/matrix-org/synapse/issues/12197))
+- Fix a misleading comment in the function `check_event_for_spam`. ([\#12203](https://github.com/matrix-org/synapse/issues/12203))
+- Remove unnecessary `pass` statements. ([\#12206](https://github.com/matrix-org/synapse/issues/12206))
+- Update the SSO username picker template to comply with SIWA guidelines. ([\#12210](https://github.com/matrix-org/synapse/issues/12210))
+- Improve code documentation for the typing stream over replication. ([\#12211](https://github.com/matrix-org/synapse/issues/12211))
+
+
 Synapse 1.54.0 (2022-03-08)
 ===========================
 
diff --git a/changelog.d/11700.removal b/changelog.d/11700.removal
deleted file mode 100644
index d3d3c48f0..000000000
--- a/changelog.d/11700.removal
+++ /dev/null
@@ -1 +0,0 @@
-Remove workaround introduced in Synapse 1.50.0 for Mjolnir compatibility. Breaks compatibility with Mjolnir 1.3.1 and earlier.
diff --git a/changelog.d/11915.misc b/changelog.d/11915.misc
deleted file mode 100644
index e3cef1511..000000000
--- a/changelog.d/11915.misc
+++ /dev/null
@@ -1 +0,0 @@
-Simplify the `ApplicationService` class' set of public methods related to interest checking.
\ No newline at end of file
diff --git a/changelog.d/11980.misc b/changelog.d/11980.misc
deleted file mode 100644
index 36e992e64..000000000
--- a/changelog.d/11980.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add config settings for background update parameters.
\ No newline at end of file
diff --git a/changelog.d/11998.doc b/changelog.d/11998.doc
deleted file mode 100644
index 33ab7b788..000000000
--- a/changelog.d/11998.doc
+++ /dev/null
@@ -1 +0,0 @@
-Fix complexity checking config example in [Resource Constrained Devices](https://matrix-org.github.io/synapse/v1.54/other/running_synapse_on_single_board_computers.html) docs page.
\ No newline at end of file
diff --git a/changelog.d/12028.feature b/changelog.d/12028.feature
deleted file mode 100644
index 5549c8f6f..000000000
--- a/changelog.d/12028.feature
+++ /dev/null
@@ -1 +0,0 @@
-Add third-party rules rules callbacks `check_can_shutdown_room` and `check_can_deactivate_user`.
diff --git a/changelog.d/12042.misc b/changelog.d/12042.misc
deleted file mode 100644
index 6ecdc9602..000000000
--- a/changelog.d/12042.misc
+++ /dev/null
@@ -1 +0,0 @@
-Correct type hints for txredis.
diff --git a/changelog.d/12090.bugfix b/changelog.d/12090.bugfix
deleted file mode 100644
index 087065dcb..000000000
--- a/changelog.d/12090.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Use the proper serialization format for bundled thread aggregations. The bug has existed since Synapse v1.48.0.
diff --git a/changelog.d/12101.misc b/changelog.d/12101.misc
deleted file mode 100644
index d165f73d1..000000000
--- a/changelog.d/12101.misc
+++ /dev/null
@@ -1 +0,0 @@
-Limit the size of `aggregation_key` on annotations.
diff --git a/changelog.d/12108.misc b/changelog.d/12108.misc
deleted file mode 100644
index b67a701db..000000000
--- a/changelog.d/12108.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add type hints to tests files.
diff --git a/changelog.d/12113.bugfix b/changelog.d/12113.bugfix
deleted file mode 100644
index df9b0dc41..000000000
--- a/changelog.d/12113.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix a long-standing bug when redacting events with relations.
diff --git a/changelog.d/12118.misc b/changelog.d/12118.misc
deleted file mode 100644
index a2c397d90..000000000
--- a/changelog.d/12118.misc
+++ /dev/null
@@ -1 +0,0 @@
-Move scripts to Synapse package and expose as setuptools entry points.
diff --git a/changelog.d/12120.misc b/changelog.d/12120.misc
deleted file mode 100644
index 360309650..000000000
--- a/changelog.d/12120.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add support for cancellation to `ReadWriteLock`.
diff --git a/changelog.d/12121.bugfix b/changelog.d/12121.bugfix
deleted file mode 100644
index df9b0dc41..000000000
--- a/changelog.d/12121.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix a long-standing bug when redacting events with relations.
diff --git a/changelog.d/12128.misc b/changelog.d/12128.misc
deleted file mode 100644
index 0570a8e32..000000000
--- a/changelog.d/12128.misc
+++ /dev/null
@@ -1 +0,0 @@
-Fix data validation to compare to lists, not sequences.
diff --git a/changelog.d/12130.bugfix b/changelog.d/12130.bugfix
deleted file mode 100644
index df9b0dc41..000000000
--- a/changelog.d/12130.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix a long-standing bug when redacting events with relations.
diff --git a/changelog.d/12131.misc b/changelog.d/12131.misc
deleted file mode 100644
index 8ef23c22d..000000000
--- a/changelog.d/12131.misc
+++ /dev/null
@@ -1 +0,0 @@
-Fix CI not attaching source distributions and wheels to the GitHub releases.
\ No newline at end of file
diff --git a/changelog.d/12132.feature b/changelog.d/12132.feature
deleted file mode 100644
index 3b8362ad3..000000000
--- a/changelog.d/12132.feature
+++ /dev/null
@@ -1 +0,0 @@
-Improve performance of logging in for large accounts.
diff --git a/changelog.d/12135.feature b/changelog.d/12135.feature
deleted file mode 100644
index b337f5173..000000000
--- a/changelog.d/12135.feature
+++ /dev/null
@@ -1 +0,0 @@
-Add experimental env var `SYNAPSE_ASYNC_IO_REACTOR` that causes Synapse to use the asyncio reactor for Twisted.
diff --git a/changelog.d/12136.misc b/changelog.d/12136.misc
deleted file mode 100644
index 98b1c1c9d..000000000
--- a/changelog.d/12136.misc
+++ /dev/null
@@ -1 +0,0 @@
-Remove unused mocks from `test_typing`.
\ No newline at end of file
diff --git a/changelog.d/12137.misc b/changelog.d/12137.misc
deleted file mode 100644
index 118ff77a9..000000000
--- a/changelog.d/12137.misc
+++ /dev/null
@@ -1 +0,0 @@
-Give `scripts-dev` scripts suffixes for neater CI config.
\ No newline at end of file
diff --git a/changelog.d/12138.removal b/changelog.d/12138.removal
deleted file mode 100644
index 6ed84d476..000000000
--- a/changelog.d/12138.removal
+++ /dev/null
@@ -1 +0,0 @@
-Remove backwards compatibilty with pagination tokens from the `/relations` and `/aggregations` endpoints generated from Synapse < v1.52.0.
diff --git a/changelog.d/12140.misc b/changelog.d/12140.misc
deleted file mode 100644
index 33a21a29f..000000000
--- a/changelog.d/12140.misc
+++ /dev/null
@@ -1 +0,0 @@
-Move `synctl` into `synapse._scripts` and expose as an entry point.
\ No newline at end of file
diff --git a/changelog.d/12142.misc b/changelog.d/12142.misc
deleted file mode 100644
index 5d09f90b5..000000000
--- a/changelog.d/12142.misc
+++ /dev/null
@@ -1 +0,0 @@
-Move the snapcraft configuration file to `contrib`.
\ No newline at end of file
diff --git a/changelog.d/12143.doc b/changelog.d/12143.doc
deleted file mode 100644
index 4b9db74b1..000000000
--- a/changelog.d/12143.doc
+++ /dev/null
@@ -1 +0,0 @@
-Improve documentation for demo scripts.
diff --git a/changelog.d/12144.misc b/changelog.d/12144.misc
deleted file mode 100644
index d8f71bb20..000000000
--- a/changelog.d/12144.misc
+++ /dev/null
@@ -1 +0,0 @@
-Enable [MSC3030](https://github.com/matrix-org/matrix-doc/pull/3030) Complement tests in CI.
diff --git a/changelog.d/12145.misc b/changelog.d/12145.misc
deleted file mode 100644
index 4092a2d66..000000000
--- a/changelog.d/12145.misc
+++ /dev/null
@@ -1 +0,0 @@
-Enable [MSC2716](https://github.com/matrix-org/matrix-doc/pull/2716) Complement tests in CI.
diff --git a/changelog.d/12146.misc b/changelog.d/12146.misc
deleted file mode 100644
index b67a701db..000000000
--- a/changelog.d/12146.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add type hints to tests files.
diff --git a/changelog.d/12149.misc b/changelog.d/12149.misc
deleted file mode 100644
index d39af9672..000000000
--- a/changelog.d/12149.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add test for `ObservableDeferred`'s cancellation behaviour.
diff --git a/changelog.d/12150.misc b/changelog.d/12150.misc
deleted file mode 100644
index 2d2706dac..000000000
--- a/changelog.d/12150.misc
+++ /dev/null
@@ -1 +0,0 @@
-Use `ParamSpec` in type hints for `synapse.logging.context`.
diff --git a/changelog.d/12151.feature b/changelog.d/12151.feature
deleted file mode 100644
index 18432b2da..000000000
--- a/changelog.d/12151.feature
+++ /dev/null
@@ -1 +0,0 @@
-Support the stable identifiers from [MSC3440](https://github.com/matrix-org/matrix-doc/pull/3440): threads.
diff --git a/changelog.d/12152.misc b/changelog.d/12152.misc
deleted file mode 100644
index b9877eacc..000000000
--- a/changelog.d/12152.misc
+++ /dev/null
@@ -1 +0,0 @@
-Prune unused jobs from `tox` config.
\ No newline at end of file
diff --git a/changelog.d/12153.misc b/changelog.d/12153.misc
deleted file mode 100644
index f02d140f3..000000000
--- a/changelog.d/12153.misc
+++ /dev/null
@@ -1 +0,0 @@
-Move CI checks out of tox, to facilitate a move to using poetry.
\ No newline at end of file
diff --git a/changelog.d/12154.misc b/changelog.d/12154.misc
deleted file mode 100644
index 18d2a4728..000000000
--- a/changelog.d/12154.misc
+++ /dev/null
@@ -1 +0,0 @@
-Avoid generating state groups for local out-of-band leaves.
diff --git a/changelog.d/12155.misc b/changelog.d/12155.misc
deleted file mode 100644
index 9f333e718..000000000
--- a/changelog.d/12155.misc
+++ /dev/null
@@ -1 +0,0 @@
-Avoid trying to calculate the state at outlier events.
diff --git a/changelog.d/12156.misc b/changelog.d/12156.misc
deleted file mode 100644
index 4818d988d..000000000
--- a/changelog.d/12156.misc
+++ /dev/null
@@ -1 +0,0 @@
-Fix some type annotations.
diff --git a/changelog.d/12157.bugfix b/changelog.d/12157.bugfix
deleted file mode 100644
index c3d2e700b..000000000
--- a/changelog.d/12157.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix a bug introduced in #4864 whereby background updates are never run with the default background batch size.
diff --git a/changelog.d/12159.misc b/changelog.d/12159.misc
deleted file mode 100644
index 30500f2fd..000000000
--- a/changelog.d/12159.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add type hints for `ObservableDeferred` attributes.
diff --git a/changelog.d/12161.misc b/changelog.d/12161.misc
deleted file mode 100644
index 43eff08d4..000000000
--- a/changelog.d/12161.misc
+++ /dev/null
@@ -1 +0,0 @@
-Use a prebuilt Action for the `tests-done` CI job.
diff --git a/changelog.d/12163.misc b/changelog.d/12163.misc
deleted file mode 100644
index 13de0895f..000000000
--- a/changelog.d/12163.misc
+++ /dev/null
@@ -1 +0,0 @@
-Reduce number of DB queries made during processing of `/sync`.
diff --git a/changelog.d/12173.misc b/changelog.d/12173.misc
deleted file mode 100644
index 9f333e718..000000000
--- a/changelog.d/12173.misc
+++ /dev/null
@@ -1 +0,0 @@
-Avoid trying to calculate the state at outlier events.
diff --git a/changelog.d/12175.bugfix b/changelog.d/12175.bugfix
deleted file mode 100644
index 881cb9b76..000000000
--- a/changelog.d/12175.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix a bug where non-standard information was returned from the `/hierarchy` API. Introduced in Synapse v1.41.0.
diff --git a/changelog.d/12179.doc b/changelog.d/12179.doc
deleted file mode 100644
index 55d8caa45..000000000
--- a/changelog.d/12179.doc
+++ /dev/null
@@ -1 +0,0 @@
-Updates to the Room DAG concepts development document.
diff --git a/changelog.d/12180.misc b/changelog.d/12180.misc
deleted file mode 100644
index 7a347352f..000000000
--- a/changelog.d/12180.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add `delay_cancellation` utility function, which behaves like `stop_cancellation` but waits until the original `Deferred` resolves before raising a `CancelledError`.
diff --git a/changelog.d/12182.misc b/changelog.d/12182.misc
deleted file mode 100644
index 7e9ad2c75..000000000
--- a/changelog.d/12182.misc
+++ /dev/null
@@ -1 +0,0 @@
-Retry HTTP replication failures, this should prevent 502's when restarting stateful workers (main, event persisters, stream writers). Contributed by Nick @ Beeper.
diff --git a/changelog.d/12183.misc b/changelog.d/12183.misc
deleted file mode 100644
index dd441bb64..000000000
--- a/changelog.d/12183.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add cancellation support to `@cached` and `@cachedList` decorators.
diff --git a/changelog.d/12187.misc b/changelog.d/12187.misc
deleted file mode 100644
index c53e68faa..000000000
--- a/changelog.d/12187.misc
+++ /dev/null
@@ -1 +0,0 @@
-Remove unused variables.
diff --git a/changelog.d/12188.misc b/changelog.d/12188.misc
deleted file mode 100644
index 403158481..000000000
--- a/changelog.d/12188.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add combined test for HTTP pusher and push rule. Contributed by Nick @ Beeper.
diff --git a/changelog.d/12189.bugfix b/changelog.d/12189.bugfix
deleted file mode 100644
index df9b0dc41..000000000
--- a/changelog.d/12189.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix a long-standing bug when redacting events with relations.
diff --git a/changelog.d/12192.misc b/changelog.d/12192.misc
deleted file mode 100644
index bdfe8dad9..000000000
--- a/changelog.d/12192.misc
+++ /dev/null
@@ -1 +0,0 @@
-Rename `HomeServer.get_tcp_replication` to `get_replication_command_handler`.
diff --git a/changelog.d/12196.doc b/changelog.d/12196.doc
deleted file mode 100644
index 269f06aa3..000000000
--- a/changelog.d/12196.doc
+++ /dev/null
@@ -1 +0,0 @@
-Document that the `typing`, `to_device`, `account_data`, `receipts`, and `presence` stream writer can only be used on a single worker.
\ No newline at end of file
diff --git a/changelog.d/12197.misc b/changelog.d/12197.misc
deleted file mode 100644
index 7d0e9b6bb..000000000
--- a/changelog.d/12197.misc
+++ /dev/null
@@ -1 +0,0 @@
-Remove some dead code.
diff --git a/changelog.d/12200.removal b/changelog.d/12200.removal
deleted file mode 100644
index 312c7ae32..000000000
--- a/changelog.d/12200.removal
+++ /dev/null
@@ -1 +0,0 @@
-The groups/communities feature in Synapse has been deprecated.
diff --git a/changelog.d/12202.misc b/changelog.d/12202.misc
deleted file mode 100644
index 9f333e718..000000000
--- a/changelog.d/12202.misc
+++ /dev/null
@@ -1 +0,0 @@
-Avoid trying to calculate the state at outlier events.
diff --git a/changelog.d/12203.misc b/changelog.d/12203.misc
deleted file mode 100644
index 892dc5bfb..000000000
--- a/changelog.d/12203.misc
+++ /dev/null
@@ -1 +0,0 @@
-Fix a misleading comment in the function `check_event_for_spam`.
diff --git a/changelog.d/12204.doc b/changelog.d/12204.doc
deleted file mode 100644
index c4b2805bb..000000000
--- a/changelog.d/12204.doc
+++ /dev/null
@@ -1 +0,0 @@
-Document that contributors can sign off privately by email.
diff --git a/changelog.d/12206.misc b/changelog.d/12206.misc
deleted file mode 100644
index df59bb56c..000000000
--- a/changelog.d/12206.misc
+++ /dev/null
@@ -1 +0,0 @@
-Remove unnecessary `pass` statements.
diff --git a/changelog.d/12207.misc b/changelog.d/12207.misc
deleted file mode 100644
index b67a701db..000000000
--- a/changelog.d/12207.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add type hints to tests files.
diff --git a/changelog.d/12208.misc b/changelog.d/12208.misc
deleted file mode 100644
index c5b635679..000000000
--- a/changelog.d/12208.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add type hints to tests files.
\ No newline at end of file
diff --git a/changelog.d/12210.misc b/changelog.d/12210.misc
deleted file mode 100644
index 3f6a8747c..000000000
--- a/changelog.d/12210.misc
+++ /dev/null
@@ -1 +0,0 @@
-Update the SSO username picker template to comply with SIWA guidelines.
diff --git a/changelog.d/12211.misc b/changelog.d/12211.misc
deleted file mode 100644
index d11634a1e..000000000
--- a/changelog.d/12211.misc
+++ /dev/null
@@ -1 +0,0 @@
-Improve code documentation for the typing stream over replication.
\ No newline at end of file
diff --git a/changelog.d/12212.feature b/changelog.d/12212.feature
deleted file mode 100644
index fe337ff99..000000000
--- a/changelog.d/12212.feature
+++ /dev/null
@@ -1 +0,0 @@
-Add a new Jinja2 template filter to extract the local part of an email address.
diff --git a/changelog.d/12215.bugfix b/changelog.d/12215.bugfix
deleted file mode 100644
index 593b12556..000000000
--- a/changelog.d/12215.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix a bug introduced in 1.54.0 that broke background updates on sqlite homeservers while search was disabled.
diff --git a/debian/changelog b/debian/changelog
index 02136a0d6..09ef24ebb 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+matrix-synapse-py3 (1.55.0~rc1) stable; urgency=medium
+
+  * New synapse release 1.55.0~rc1.
+
+ -- Synapse Packaging team <packages@matrix.org>  Tue, 15 Mar 2022 10:59:31 +0000
+
 matrix-synapse-py3 (1.54.0) stable; urgency=medium
 
   * New synapse release 1.54.0.
diff --git a/synapse/__init__.py b/synapse/__init__.py
index 4b0056597..870707f47 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -68,7 +68,7 @@ try:
 except ImportError:
     pass
 
-__version__ = "1.54.0"
+__version__ = "1.55.0rc1"
 
 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