Major enhancement
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Major update of the Alpine-based Jenkins Docker image.
Jenkins Docker image for Alpine now uses Alpine 3.12 and AdoptOpenJDK 8u262.
LTS upgrade guide
Major bug fix
Bug fix
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Fix Cmd + Enter not running the script in the Script Console on a Mac (regression in 2.248).
JENKINS-63342
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Fix backspace key sometimes did not delete text from the Script Console on a Mac (regression in 2.248).
JENKINS-63342
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Fix regular expression validator UI location (regression in 2.244).
JENKINS-63308
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Make alert colors consistent with 'Manage Jenkins' alert colors.
JENKINS-63330
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Developer: Make unavailable plugin background themeable.
JENKINS-63331
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Internal: Remove some text messages from Jenkins core which had already been moved to the LDAP and PAM Authentication plugins.
Be sure to upgrade to LDAP 1.22 or newer and PAM Authentication 1.5 or newer.
pull 4866
Enhancement
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Add Japanese translations for user configuration screen.
pull 4904
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Prevent concurrent build deletion.
JENKINS-61687
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Developer: Expose fingerprint range set serialization methods for plugins.
pull 4888
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Internal: Remove deprecated and unused
ProcessTreeKiller class.
pull 4874
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Internal: Exclude JUnit and Hamcrest libraries from the jenkins.war bundle.
JENKINS-63269