Jenkins 2.491: WARNING 'Jenkins.agentProtocols no longer configurable' despite removing it from JCasC

Issue

I'm getting a warning on every start of Jenkins about this (since upgrade to 2.486)

jenkins-master [id=21] WARNING jenkins.model.Jenkins#setAgentProtocols jenkins-master 2:00 java.lang.IllegalStateException: Jenkins.agentProtocols no longer configurable

From what I understand, support for configuring agentProtocols was deprecated starting from Jenkins 2.486. That is when I removed it from configuration.

All plugins are up to date.

Question

Where could Jenkins still be getting this agentProtocols from, if it's nowhere in casc or config.xml files?

Solution

The jenkins-operator creates a (config map with a) Groovy script.

https://github.com/jenkinsci/kubernetes-operator/blob/d919a2a11cf1b6417daaa414ad315cf3cc985fcc/pkg/configuration/base/resources/base_configuration_configmap.go#L80

They call the deprecated setAgentProtocols method which triggers the warning.