- Added a ton of PHPStan type annotations as well as type aliases on Monolog\Logger for Record, Level and LevelName that you can import (#1557)
- Added ability to customize date format when using JsonFormatter (#1561)
- Fixed FilterHandler not calling reset on its internal handler when reset() is called on it (#1531)
- Fixed SyslogUdpHandler not setting the timezone correctly on DateTimeImmutable instances (#1540)
- Fixed StreamHandler thread safety - chunk size set to 2GB now to avoid interlacing when doing concurrent writes (#1553)