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Features
--------

-   Enforce the specified API for report\_event ([\#3316](https://github.com/matrix-org/synapse/issues/3316))
-   Include CPU time from database threads in request/block metrics.
([\#3496](https://github.com/matrix-org/synapse/issues/3496), [\#3501](https://github.com/matrix-org/synapse/issues/3501))
-   Add CPU metrics for \_fetch\_event\_list ([\#3497](https://github.com/matrix-org/synapse/issues/3497))
-   optimisation for /sync ([\#3505](https://github.com/matrix-org/synapse/issues/3505),
[\#3521](https://github.com/matrix-org/synapse/issues/3521))
-   Optimisation to make handling incoming federation requests more efficient.
([\#3541](https://github.com/matrix-org/synapse/issues/3541))

Bugfixes
--------

-   Use more portable syntax in our use of the attrs package, widening the supported versions
([\#3498](https://github.com/matrix-org/synapse/issues/3498))
-   Fix queued federation requests being processed in the wrong order
([\#3533](https://github.com/matrix-org/synapse/issues/3533))
-   Ensure that erasure requests are correctly honoured for publicly accessible rooms when accessed over federation.
([\#3546](https://github.com/matrix-org/synapse/issues/3546))
-   Disable a noisy warning about logcontexts ([\#3561](https://github.com/matrix-org/synapse/issues/3561))

Misc
----

-   [\#3351](https://github.com/matrix-org/synapse/issues/3351), [\#3463](https://github.com/matrix-org/synapse/issues/3463),
[\#3464](https://github.com/matrix-org/synapse/issues/3464), [\#3499](https://github.com/matrix-org/synapse/issues/3499),
[\#3530](https://github.com/matrix-org/synapse/issues/3530), [\#3534](https://github.com/matrix-org/synapse/issues/3534),
[\#3535](https://github.com/matrix-org/synapse/issues/3535), [\#3540](https://github.com/matrix-org/synapse/issues/3540),
[\#3544](https://github.com/matrix-org/synapse/issues/3544)