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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.
JENKINS-48365
Bug fix
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Make the system property
hudson.consoleTailKB actually work.
JENKINS-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.
JENKINS-48505
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Prevent setup wizard from hanging when the two provided passwords differ, instead show a validation error.
JENKINS-48080
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Prevent concurrent installation of Maven on the same node to prevent problems.
JENKINS-34138
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Prevent potential
NullPointerException when migrating the default "All View" name for a "My Views" user property.
JENKINS-48157
Enhancement
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Cache permission names, allowing Jenkins to recover faster after "stop-the-world" Java GC pauses.
JENKINS-48349
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Improve user lookup performance, for example from Git changelog calculation.
JENKINS-47429