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Security
Bug fix
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A thread pool used to wait for external processes to complete could leak class loaders.
JENKINS-57725
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Make sure detached plugins (plugins whose functionality used to be part of Jenkins itself) are installed upon Jenkins startup when needed as implied dependencies of other plugins which were already present.
This simplifies compatibility for specialized installation scenarios not using the update center, such as when Jenkins is run from a Docker image prepackaged with some plugins.
JENKINS-57528
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Update WinP from 1.27 to 1.28 to fix problems with a missing DLL and flickering console window in the Windows graceful process shutdown logic.
JENKINS-57477, full changelog
Enhancement
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Replace some exception stack traces related to agent channels with simpler messages.
JENKINS-57993