Synapse 1.99.0 is the first Synapse release under an AGPLv3.0 licence (with CLA to enable Element to sell AGPL

exceptions). You can read more about this here:

 - https://matrix.org/blog/2023/11/06/future-of-synapse-dendrite/
 - https://element.io/blog/element-to-adopt-agplv3/
 - https://element.io/blog/synapse-now-lives-at-github-com-element-hq-synapse/

No significant changes since 1.99.0rc1.

- Add [config options](https://element-hq.github.io/synapse/v1.99/usage/configuration/config_documentation.html#server_notices) to set the avatar and the topic of the server notices room, as well as the avatar of the server notices user. ([\#16679](https://github.com/matrix-org/synapse/issues/16679))
- Add config option [`email.notif_delay_before_mail`](https://element-hq.github.io/synapse/v1.99/usage/configuration/config_documentation.html#email) to tweak the delay before an email is sent following a notification. ([\#16696](https://github.com/matrix-org/synapse/issues/16696))
- Add new configuration option [`sentry.environment`](https://element-hq.github.io/synapse/v1.99/usage/configuration/config_documentation.html#sentry) for improved system monitoring. Contributed by @zeeshanrafiqrana. ([\#16738](https://github.com/matrix-org/synapse/issues/16738))
- Filter out rooms from the room directory being served to other homeservers when those rooms block that homeserver by their Access Control Lists. ([\#16759](https://github.com/element-hq/synapse/issues/16759))

- Fix a long-standing bug where the signing keys generated by Synapse were world-readable. Contributed by Fabian Klemp. ([\#16740](https://github.com/matrix-org/synapse/issues/16740))
- Fix email verification redirection. Contributed by Fadhlan Ridhwanallah. ([\#16761](https://github.com/element-hq/synapse/issues/16761))
- Fixed a bug that prevented users from being queried by display name if it contains non-ASCII characters. ([\#16767](https://github.com/element-hq/synapse/issues/16767))
- Allow reactivate user without password with Admin API in some edge cases. ([\#16770](https://github.com/element-hq/synapse/issues/16770))
- Adds the `recursion_depth` parameter to the response of the /relations endpoint if MSC3981 recursion is being performed. ([\#16775](https://github.com/element-hq/synapse/issues/16775))

- Added version picker for Synapse documentation. Contributed by @Dmytro27Ind. ([\#16533](https://github.com/matrix-org/synapse/issues/16533))
- Clarify that `password_config.enabled: "only_for_reauth"` does not allow new logins to be created using password auth. ([\#16737](https://github.com/matrix-org/synapse/issues/16737))
- Remove value from header in configuration documentation for `refresh_token_lifetime`. ([\#16763](https://github.com/element-hq/synapse/issues/16763))
- Add another custom statistics collection server to the documentation. Contributed by @loelkes. ([\#16769](https://github.com/element-hq/synapse/issues/16769))

- Remove run-once workflow after adding the version picker to the documentation. ([\#9453](https://github.com/element-hq/synapse/issues/9453))
- Update the implementation of [MSC2965](https://github.com/matrix-org/matrix-spec-proposals/pull/2965) (OIDC Provider discovery). ([\#16726](https://github.com/matrix-org/synapse/issues/16726))
- Move the rust stubs inline for better IDE integration. ([\#16757](https://github.com/element-hq/synapse/issues/16757))
- Fix sample config doc CI. ([\#16758](https://github.com/element-hq/synapse/issues/16758))
- Simplify event internal metadata class. ([\#16762](https://github.com/element-hq/synapse/issues/16762), [\#16780](https://github.com/element-hq/synapse/issues/16780))
- Sign the published docker image using [cosign](https://docs.sigstore.dev/). ([\#16774](https://github.com/element-hq/synapse/issues/16774))
- Port `EventInternalMetadata` class to Rust. ([\#16782](https://github.com/element-hq/synapse/issues/16782))

* Bump actions/setup-go from 4 to 5. ([\#16749](https://github.com/matrix-org/synapse/issues/16749))
* Bump actions/setup-python from 4 to 5. ([\#16748](https://github.com/matrix-org/synapse/issues/16748))
* Bump immutabledict from 3.0.0 to 4.0.0. ([\#16743](https://github.com/matrix-org/synapse/issues/16743))
* Bump isort from 5.12.0 to 5.13.0. ([\#16745](https://github.com/matrix-org/synapse/issues/16745))
* Bump isort from 5.13.0 to 5.13.1. ([\#16752](https://github.com/matrix-org/synapse/issues/16752))
* Bump pydantic from 2.5.1 to 2.5.2. ([\#16747](https://github.com/matrix-org/synapse/issues/16747))
* Bump ruff from 0.1.6 to 0.1.7. ([\#16746](https://github.com/matrix-org/synapse/issues/16746))
* Bump types-setuptools from 68.2.0.2 to 69.0.0.0. ([\#16744](https://github.com/matrix-org/synapse/issues/16744))
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