Closes: #13643

When there are many synchronous requests waiting on a
`_PerHostRatelimiter`, each request will be started recursively just
after the previous request has completed. Under the right conditions,
this leads to stack exhaustion.

A common way for requests to become synchronous is when the remote
client disconnects early, because the homeserver is overloaded and slow
to respond.

Avoid stack exhaustion under these conditions by deferring subsequent
requests until the next reactor tick.

Fixes #14480.

Signed-off-by: Sean Quah <seanq@matrix.org>

* Re-enable some linting

* Newsfile

* Remove comment

Fixes #14814

Faster remote room joins (worker mode): do not populate external hosts-in-room cache when sending events as this requires blocking for full state. (#14749)

Signed-off-by: Olivier Wilkinson (reivilibre) <oliverw@matrix.org>
Co-authored-by: Sean Quah <seanq@matrix.org>

Add index to improve performance of the `/timestamp_to_event` endpoint used for jumping to a specific date in the timeline of a room. (#14799)

Back-out some changes from 7e582a25
(#14786) which skipped necessary logic to calculate device lists properly.

Fixes: #8780

* Add `tag` to `listeners` documentation

* newsfile

Two parts to this:

 * Bundle the whole of the replacement with any edited events. This is backwards-compatible so I haven't put it behind a flag.
 * Optionally, inhibit server-side replacement of edited events. This has scope to break things, so it is currently disabled by default.

* Add missing worker settings to shared configuration

* newsfile

* update docs after review

* more update for doc

* This -> These

Co-authored-by: David Robertson <david.m.robertson1@gmail.com>

* Remove undocumented device from pushrules

* Add changelog

* Update changelog.d/14727.misc

* Rename 14727.misc to 14727.bugfix

Co-authored-by: David Robertson <davidr@element.io>

* Update link to towncrier in contribution guide

* newsfile

* Fix upgrade notes for installing ICU

As noticed in https://github.com/matrix-org/synapse/pull/14712/files#r1058433297

* Changelog

It doesn't seem valid that HTML entities should appear in
the title field of oEmbed responses, but a popular WordPress
plug-in seems to do it.

There should not be harm in unescaping these.

This has two related changes:

* It enables fast-path processing for an empty filter (`[]`) which was
  previously only used for wildcard not-filters (`["*"]`).
* It special cases a `/sync` filter with no-rooms to skip all room
  processing, previously we would partially skip processing, but would
  generally still calculate intermediate values for each room which were
  then unused.

Future changes might consider further optimizations:

* Skip calculating per-room account data when all rooms are filtered (currently
  this is thrown away).
* Make similar improvements to other endpoints which support filters.

* Fixes #12277 :Disable sending confirmation email when 3pid is disabled

* Fix test_add_email_if_disabled test case to reflect changes to enable_3pid_changes flag

* Add changelog file

* Rename newsfragment.

Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>

* Bump peaceiris/actions-gh-pages from 3.9.0 to 3.9.1

Bumps [peaceiris/actions-gh-pages](https://github.com/peaceiris/actions-gh-pages) from 3.9.0 to 3.9.1.
- [Release notes](https://github.com/peaceiris/actions-gh-pages/releases)
- [Changelog](https://github.com/peaceiris/actions-gh-pages/blob/main/CHANGELOG.md)
- [Commits](https://github.com/peaceiris/actions-gh-pages/compare/de7ea6f8efb354206b205ef54722213d99067935...64b46b4226a4a12da2239ba3ea5aa73e3163c75b

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* Bump importlib-metadata from 4.2.0 to 6.0.0

Bumps [importlib-metadata](https://github.com/python/importlib_metadata) from 4.2.0 to 6.0.0.
- [Release notes](https://github.com/python/importlib_metadata/releases)
- [Changelog](https://github.com/python/importlib_metadata/blob/main/CHANGES.rst)
- [Commits](https://github.com/python/importlib_metadata/compare/v4.2.0...v6.0.0

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* Bump ruff from 0.0.206 to 0.0.215

Bumps [ruff](https://github.com/charliermarsh/ruff) from 0.0.206 to 0.0.215.
- [Release notes](https://github.com/charliermarsh/ruff/releases)
- [Changelog](https://github.com/charliermarsh/ruff/blob/main/BREAKING_CHANGES.md)
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* Bump types-setuptools from 65.6.0.2 to 65.6.0.3

Bumps [types-setuptools](https://github.com/python/typeshed) from 65.6.0.2 to 65.6.0.3.
- [Release notes](https://github.com/python/typeshed/releases)
- [Commits](https://github.com/python/typeshed/commits

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* Bump pyopenssl from 22.1.0 to 23.0.0

Bumps [pyopenssl](https://github.com/pyca/pyopenssl) from 22.1.0 to 23.0.0.
- [Release notes](https://github.com/pyca/pyopenssl/releases)
- [Changelog](https://github.com/pyca/pyopenssl/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/pyca/pyopenssl/compare/22.1.0...23.0.0

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* Bump types-pillow from 9.3.0.4 to 9.4.0.0

Bumps [types-pillow](https://github.com/python/typeshed) from 9.3.0.4 to 9.4.0.0.
- [Release notes](https://github.com/python/typeshed/releases)
- [Commits](https://github.com/python/typeshed/commits

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