Bug fix
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Update Groovy to 2.4.8 to address memory leak issue. Do not use this version if you are running Pipeline builds unless you also update Pipeline: Groovy to 2.28 or higher.
JENKINS-33358, JENKINS-42189
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Windows service restart did not retain build queue.
JENKINS-32820
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Exceptions during Jenkins cleanup step should not block restart.
JENKINS-42164
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Remoting 3.5: Remoting clients now accept lowercase (HTTP 2) headers sent by reverse proxies.
JENKINS-40710
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Remoting 3.5: Stability improvements.
JENKINS-41513, JENKINS-41852
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Developer: Snapshot builds of plugins that had dependencies on other snapshot builds were not having their version numbers compared correctly.
JENKINS-41899
Enhancement
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Upgrade Remoting to version 3.5.
full changelog
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Remoting 3.5: Add option to specify the Remoting protocol to use on the client.
JENKINS-41730