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Major bug fix

Fix localized versions to no longer report can't parse argument number: changelog.url (regression in 2.214). JENKINS-60822
Jenkins 2.212+ failed to load certain injected fields such as used by the Bitbucket Server Integration plugin. JENKINS-60816

Major enhancement

Add experimental WebSocket support. JEP-222, blog post
Internal: frontend toolchain upgraded to use webpack. Enabled babel to transpile certain JS modules. JENKINS-60734

Enhancement

Upgrade Jetty from 9.4.22.v20191022 to 9.4.25.v20191220. Jetty 9.4.23 release notes, Jetty 9.4.24 release notes, Jetty 9.4.25 release notes
Upgrade to Remoting 4.0. Remoting 4.0 release notes
Developer: Update access-modifier to allow plugins to use suppressions pull 4441

Bug fix

Prevent inaccurate warnings about missing classes on Java 11 triggered by JavaMelody when Monitoring Plugin is installed. JENKINS-60725
Fix java version check for AdoptOpenJDK 11. JENKINS-60678