We went from Jenkins 1.651.1 to 2.7.2 and our Jenkins master kept on 
crashing with:
java.lang.OutOfMemoryError: PermGen space

Where were not specifying -XX:MaxPermSize in our JENKINS_JAVA_OPTIONS 
before, so I added it, and kept on increasing the value after every crash.
We are now at 512m:

JENKINS_JAVA_OPTIONS="-Djava.awt.headless=true -Xms3584m -Xmx3584m 
-XX:MaxPermSize=512m 
-Dhudson.model.ParametersAction.keepUndefinedParameters=true"

Using the Jenkins Monitoring plugin, we see that the Loaded Classes Count 
keeps growing without stopping:

<https://lh3.googleusercontent.com/-KnFb1isIibc/V8G_bAUCMzI/AAAAAAAADYk/b0XjUEGvWVM8mumIpJrTB0WEkerXBqyVwCLcB/s1600/jenkins.png>
How do you debug this? 
Something must be loading classes continuously.


Any ideas how we can debug this?

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