Synapse 1.45.0rc2 (2021-10-14)

This release candidate fixes a user directory bug present in 1.45.0rc1.

Known Issues

• A suspected performance regression which was first reported after the release of v1.44.0 remains unresolved.

  We have not been able to identify a probable cause. Affected users report that setting up a federation sender worker appears to alleviate symptoms of the regression.

Bugfixes

• Fix a long-standing bug when using multiple event persister workers where events were not correctly sent down /sync due to a race. (#11045)
• Fix a bug introduced in Synapse 1.45.0rc1 where the user directory would stop updating if it processed an event from a
  user not in the users table. (#11053)
• Fix a bug introduced in Synapse v1.44.0 when logging errors during oEmbed processing. (#11061)

Internal Changes

• Add an 'approximate difference' method to StateFilter. (#10825)
• Fix inconsistent behavior of get_last_client_by_ip when reporting data that has not been stored in the database yet. (#10970)
• Fix a bug introduced in Synapse 1.21.0 that causes opentracing and Prometheus metrics for replication requests to be measured incorrectly. (#10996)
• Ensure that cache config tests do not share state. (#11036)