2025-11-10 Release of logback version 1.5.21
• Invocations of turbo filters in isDebugEnabled, isInfoEnabled()... remain as they were, untouched. However, any installed instances of TurboFilter are now invoked also from within the log(LoggingEvent) method of Logger with the contents of the LoggingEvent, typically via the fluent API. This fixes issues/871.
• Removed reentry-guard in most subclasses of UnsynchronizedAppenderBase where it was not needed.
• Initialization procedure has been simplified by removing the step instantiating a SerializedModelConfigurator. However, it is still possible to set up SerializedModelConfigurator as a custom configurator.
• JsonEncoder is now friendlier to derivation by sub-classes as requested in issues/979.
• Fixed XMLLayout thread safety issue reported in LOGBACK-427.
• Removed superfluous buffering in Zip, GZ and XZ compression code.
• A bit-wise identical binary of this version can be reproduced by building from source code at commit fed6f37 associated with the tag v_1.5.21. Release built using Java "21" 2023-10-17 LTS build 21.0.1.+12-LTS-29 under Linux Debian 11.6.