Upgrading to Jenkins 2.89.1 does not install the Command Launcher plugin (see below) as it should. If you're using the Launch agent via execution of command on the master launch method for agents, or cloud provider plugins, make sure to manually install the plugin after upgrading, and restart Jenkins afterwards.
Looking to upgrade?
Check the Upgrade Guide for assistance
Changes since 2.89
Major bug fix
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Recover from legacy user configuration folders with
$ characters that are not part of hex escape sequences. (regression in 2.89)
JENKINS-47909
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Fix Download from java.sun.com installation method for JDK for downloads requiring an Oracle login after change to the Oracle site.
JENKINS-47448
Enhancement
Bug fix
Notable changes since 2.73.3
Major enhancement
Major bug fix
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Prevent core or plugin code from mistakenly attempting to serialize jobs, builds, and users except in their intended top-level XML file positions, preventing a class of serious deserialization-related errors.
JENKINS-45892
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Developer: Fix
TimeDuration time unit handling and its incorrect usage. TimeDuration uses milliseconds as the default unit. It was supposed to parse sec or secs suffix to interpret the number as seconds, but that never worked.
JENKINS-44052
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Stapler 1.252: Prevent file handle leak in
LargeText#GzipAwareSession.
JENKINS-45903
Bug fix
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Stapler 1.252: Restore ability to attach views to interfaces. (regression in 2.46)
JENKINS-43715
Enhancement
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Stapler 1.253: Servlet 3.1 support, improved Blue Ocean performance and changes of interest to plugin developers.
JENKINS-37062, Stapler changelog
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Disable obsolete JNLP, JNLP2, and CLI protocols on new Jenkins installations during Setup Wizard.
JENKINS-45841, announcement blog post
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Restart agent communication related threads on both controller and agents when encountering an unhandled exception, if possible, to improve stability.
JENKINS-38711
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Default the built-in Jenkins Update Center URL to
https://updates.jenkins.io instead of obsolete HTTP endpoint. This requires a JRE compatible with Let's Encrypt, e.g. Oracle JRE 8u101.
pull 2996
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Moved Jenkins agent runtime to
agent.jar file name, and deprecate (but still support) use of legacy slave.jar. Introduce the AGENTJAR_URL environment variable as replacement for SLAVEJAR_URL.
JENKINS-35451
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Improve error reporting when failing to archive artifacts.
pull 2976
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Enable
cc.xml to export jobs in folders recursively when accessed with a query parameter named recursive.
JENKINS-36282
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Add new administrative monitor warning users about disabled CSRF protection.
JENKINS-47372
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Commons Codec library upgraded from 1.8 to 1.9.
pull 3033
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Agents JVM must be 1.8+ and a clear message is shown in connection logs if it is not.
JENKINS-44851
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Add sidebar link to create new view.
JENKINS-6290