release notes

[ci]

Signed-off-by: Nicu Reut <nicu.reut@digitalasset.com>

Author: nicu-da

docs/src/release_notes.rst

@@ -97,6 +97,11 @@
     - Add a new config field to ``SvOnboardingConfig`` named ``unclaimedDevelopmentFundCouponsThreshold`` defining the
       threshold above which ``UnclaimedDevelopmentFundCoupon`` s are merged. The default value is set to 10.
 
+  - Deployments
+
+    - The default logger has been switched to use an asynchronous appender, for all the nodes, for better performance.
+      The behavior can be switched back to synchronous logging by setting the environment variable `LOG_IMMEDIATE_FLUSH=true`.
+
 .. release-notes:: 0.5.6
 
   - Sequencer