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+---
+date: '2022-10-17'
+title: Synapse 1.69 released
+categories:
+- Releases
+author: Brendan Abolivier
+---
+
+Hey everyone, it's time for a new Synapse release! [Synapse
+1.69](https://github.com/matrix-org/synapse/releases/tag/v1.69.0) is out, fresh
+out of the oven. But before we take a look at it, here's a quick announcement:
+
+> We have recently disclosed a moderate severity security vulnerability, which
+> was fixed in [Synapse
+> 1.62](https://matrix.org/blog/2022/07/06/synapse-1-62-released/) (released on
+> July 5th 2022). This issue affects all homeservers running a version of
+> Synapse older than 1.62 with open federation. If this is the case for your
+> deployment, please update to a more recent version of Synapse at your earliest
+> convenience.
+>
+> See advisory
+> [GHSA-jhjh-776m-4765](https://github.com/matrix-org/synapse/security/advisories/GHSA-jhjh-776m-4765)
+> and [CVE-2022-31152](https://www.cve.org/CVERecord?id=CVE-2022-31152) for more
+> information.
+
+Now let's see what's new in Synapse 1.69!
+
+## Caching in modules
+
+Synapse modules allow third-party developers to extend Synapse's feature range
+to include very custom features.
+
+Synapse 1.69 includes tools modules can use to interact with Synapse's caching
+system, which includes features such as synchronising caches across multiple
+Synapse workers.
+
+Starting with this version, modules can import the `@cache()` decorator from
+`synapse.module_api`, to decorate functions which results must be cached. Cached
+functions need to be registered with
+[`ModuleApi.register_cached_function`](https://github.com/matrix-org/synapse/blob/v1.69.0/synapse/module_api/__init__.py#L839-L853)
+at the module's initialisation. Invalidating a cached function's result for a
+given set of arguments can be done using [`ModuleApi.invalidate_cache`](https://github.com/matrix-org/synapse/blob/v1.69.0rc1/synapse/module_api/__init__.py#L855-L872).
+
+## Upcoming removal of deprecated Prometheus metric names
+
+Back in [Synapse
+1.2](https://matrix.org/blog/2019/07/25/synapse-1-2-0-released), we deprecated a
+number of Prometheus metrics, to replace them with more aptly named equivalents
+that fit existing naming conventions better.
+
+With Synapse 1.69, we're announcing the plan for the removal for these
+deprecated metrics. Synapse 1.71 (due to be released on November 8) will turn
+these metrics off by default (though it will still be possible to enable them
+back). Synapse 1.73 (due to be released on November 22) will remove them
+altogether.
+
+Server administrators using metrics dashboards that rely on the deprecated
+metrics are encouraged to update their dashboards with the new metric names. See
+the [upgrade
+notes](https://matrix-org.github.io/synapse/v1.69/upgrade.html#deprecation-of-legacy-prometheus-metric-names) for more information.
+
+## Everything else
+
+Synapse 1.69 also deprecates the `generate_short_term_login_token` module API
+method in favour of the asynchronous `create_login_token` one. The deprecated
+method will be removed in Synapse 1.71. See the [upgrade
+notes](https://matrix-org.github.io/synapse/v1.69/upgrade.html#deprecation-of-the-generate_short_term_login_token-module-api-method)
+for more information.
+
+Additionally, Synapse 1.69 introduces a forwards- and backwards-incompatible
+change to the replication of read receipts. This means that read receipts
+replicated by workers running Synapse 1.68 will not be able to be processed by
+workers running Synapse 1.69 and vice-versa. Once all workers are made to run
+Synapse 1.69 (or 1.68), replication of read receipts will resume as normal. See
+the [upgrade
+notes](https://matrix-org.github.io/synapse/v1.69/upgrade.html#changes-to-the-receipts-replication-streams) for more information.
+
+See the [full
+changelog](https://github.com/matrix-org/synapse/releases/tag/v1.66.0) for a
+complete list of changes in this release. Also please have a look at the
+[upgrade
+notes](https://matrix-org.github.io/synapse/v1.69/upgrade#upgrading-to-v1690)
+for this version.
+
+Synapse is a Free and Open Source Software project, and we'd like to extend our
+thanks to everyone who contributed to this release, including (in no particular
+order) [lukasdenk](https://github.com/lukasdenk), [Dirk
+Klimpel](https://github.com/dklimpel), [Ashish
+Kumar](https://github.com/ashfame), [Famedly](https://www.famedly.com/) and
+[Beeper](https://www.beeper.com/), as well as anyone helping us make Synapse
+better by sharing their feedback and reporting issues.
+