Enhancement
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Add support for the ed25519 key algorithm in Jenkins CLI.
JENKINS-45318
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Do not show the Launch agent from browser button (Java Web Start) if Jenkins is running on Java 11.
JENKINS-52282
Bug fix
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Do not hide newer releases of plugins from secondary update sites.
JENKINS-45235
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Check
hudson.PluginManager.checkUpdateAttempts system property instead of hudson.PluginManager.CHECK_UPDATE_ATTEMPTS.
JENKINS-54731, JENKINS-54459