Resolution
You can run the following from the Script Console ($JENKINS_URL/script
):
import hudson.model.* recurseChildren(Hudson.instance.items) def recurseChildren(items) { items.each { item -> if (item.class.canonicalName != 'com.cloudbees.hudson.plugins.folder.Folder') { props = item.getProperty(ParametersDefinitionProperty.class) if (props != null) { props.getParameterDefinitions().removeAll { 'MY_BUILD_PARAM' == it.name } } } else { recurseChildren(((com.cloudbees.hudson.plugins.folder.Folder) item).getItems()) } } }
Replace MY_BUILD_PARAM
with the build parameter you want to bulk delete.