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Major bug fix
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Make sure detached plugins (plugins whose functionality used to be part of Jenkins itself) are installed when upgrading Jenkins past the version at which the plugin was detached.
issue 48365
Bug fix
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Make the system property
hudson.consoleTailKB actually work.
issue 48593, Jenkins features controlled by system properties
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Fix a performance regression in Jenkins 2.86 due to lock contention in
ExtensionList.
issue 48505
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Prevent setup wizard from hanging when the two provided passwords differ, instead show a validation error.
issue 48080
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Prevent concurrent installation of Maven on the same node to prevent problems.
issue 34138
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Prevent potential
NullPointerException when migrating the default "All View" name for a "My Views" user property.
issue 48157
Enhancement
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Cache permission names, allowing Jenkins to recover faster after "stop-the-world" Java GC pauses.
issue 48349
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Improve user lookup performance, for example from Git changelog calculation.
issue 47429