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Basic documentation for the release cycle. (#11954)

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Add information on the Synapse release cycle.

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# Development
- [Contributing Guide](development/contributing_guide.md)
- [Code Style](code_style.md)
- [Release Cycle](development/releases.md)
- [Git Usage](development/git.md)
- [Testing]()
- [OpenTracing](opentracing.md)

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# Synapse Release Cycle
Releases of Synapse follow a two week release cycle with new releases usually
occurring on Tuesdays:
* Day 0: Synapse `N - 1` is released.
* Day 7: Synapse `N` release candidate 1 is released.
* Days 7 - 13: Synapse `N` release candidates 2+ are released, if bugs are found.
* Day 14: Synapse `N` is released.
Note that this schedule might be modified depending on the availability of the
Synapse team, e.g. releases may be skipped to avoid holidays.
Release announcements can be found in the
[release category of the Matrix blog](https://matrix.org/blog/category/releases).
## Bugfix releases
If a bug is found after release that is deemed severe enough (by a combination
of the impacted users and the impact on those users) then a bugfix release may
be issued. This may be at any point in the release cycle.
## Security releases
Security will sometimes be backported to the previous version and released
immediately before the next release candidate. An example of this might be:
* Day 0: Synapse N - 1 is released.
* Day 7: Synapse (N - 1).1 is released as Synapse N - 1 + the security fix.
* Day 7: Synapse N release candidate 1 is released (including the security fix).
Depending on the impact and complexity of security fixes, multiple fixes might
be held to be released together.
In some cases, a pre-disclosure of a security release will be issued as a notice
to Synapse operators that there is an upcoming security release. These can be
found in the [security category of the Matrix blog](https://matrix.org/blog/category/security).