Added Symbol annotations for ParametersDefinitionProperty and BuildDiscarderPropert (#2358)

core/src/main/java/hudson/model/ParametersDefinitionProperty.java

@@ -44,6 +44,7 @@ import jenkins.model.ParameterizedJobMixIn;
 import jenkins.util.TimeDuration;
 import net.sf.json.JSONArray;
 import net.sf.json.JSONObject;
+import org.jenkinsci.Symbol;
 import org.kohsuke.accmod.Restricted;
 import org.kohsuke.accmod.restrictions.NoExternalUse;
 import org.kohsuke.stapler.DataBoundConstructor;
@@ -218,6 +219,7 @@ public class ParametersDefinitionProperty extends OptionalJobProperty<Job<?, ?>>
     }
 
     @Extension
+    @Symbol("parameters")
     public static class DescriptorImpl extends OptionalJobPropertyDescriptor {
         @Override
         public boolean isApplicable(Class<? extends Job> jobType) {

core/src/main/java/jenkins/model/BuildDiscarderProperty.java

@@ -29,6 +29,7 @@ import hudson.model.Descriptor;
 import hudson.model.DescriptorVisibilityFilter;
 import hudson.model.Items;
 import hudson.model.Job;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.DataBoundConstructor;
 
 /**
@@ -49,6 +50,7 @@ public class BuildDiscarderProperty extends OptionalJobProperty<Job<?,?>> {
     }
 
     @Extension
+    @Symbol("buildDiscarder")
     public static class DescriptorImpl extends OptionalJobPropertyDescriptor {
 
         @Override