Update to Windows Service Wrapper 2.0.3 and Windows Agent Installer 1.8 to prevent conversion of environment variables to lowercase in the agent executable, regression in Jenkins 2.50.
JENKINS-42744, WinSW Changelog, Windows Agent Installer changelog
Enhancement
GC Performance: Avoid using FileInputStream and FileOutputStream in the core codebase.
JDK-8080225, JENKINS-42934
Internal API: Add support of a new full screen mode in layout.jelly.
JENKINS-34670
Bug fix
Packaging: Do not invoke recursive chown in JENKINS_HOME during the RPM post-install step unless owned by a different user.
JENKINS-23273