Major enhancement
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The agent-to-controller security subsystem is now always enabled. The admin-customizable allowlists for callables and file paths have been removed. The ability to access some files on the controller from agents has been removed. Some plugins are incompatible with this change and may need to be updated.
pull 5885, JENKINS-67173, the issue tracker
Enhancement
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Add missing SVG for parameterized job icon.
pull 5905
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Add "Report an issue" link to plugins in the plugin manager.
JENKINS-65113
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Upgrade Groovy from 2.4.12 to 2.4.21.
pull 5939, Groovy 2.4.13 changelog, Groovy 2.4.14 changelog, Groovy 2.4.15 changelog, Groovy 2.4.16 changelog, Groovy 2.4.17 changelog, Groovy 2.4.18 changelog, Groovy 2.4.19 changelog, Groovy 2.4.20 changelog, Groovy 2.4.21 changelog, Groovy language site
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Developer: Stapler now returns an informative error message when a request is made for an invalid adjunct.
pull 6066
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Developer: Deprecate
SlaveToMasterFileCallable.
JENKINS-67173
Major bug fix
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- Restore support for symbolic links in the Jenkins home directory (regression in 2.325).
JENKINS-67372