I'm using a script similar to https://github.com/jenkinsci/configuration-as-code-groovy-plugin/blob/master/demos/gerrit-trigger.yml to configure Gerrit servers in Jenkins.

Apparently, this script no longer works with Gerrit Trigger plugin >= 2.31.0.

Running the following in the Jenkins script console prints "null":

import com.sonyericsson.hudson.plugins.gerrit.trigger.PluginImpl
println(Jenkins.instance.pluginManager.getPlugin(PluginImpl.class))

After downgrading to 2.30.5, I'm getting a non-null result and the script mentioned above works.