Add REST API endpoint for administrative monitors

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

@@ -39,6 +39,8 @@
 import org.kohsuke.stapler.StaplerProxy;
 import org.kohsuke.stapler.StaplerRequest2;
 import org.kohsuke.stapler.StaplerResponse2;
+import org.kohsuke.stapler.export.Exported;
+import org.kohsuke.stapler.export.ExportedBean;
 import org.kohsuke.stapler.interceptor.RequirePOST;
 
 /**
@@ -89,6 +91,7 @@
  * @see Jenkins#administrativeMonitors
  */
 @LegacyInstancesAreScopedToHudson
+@ExportedBean
 public abstract class AdministrativeMonitor extends AbstractModelObject implements ExtensionPoint, StaplerProxy {
     /**
      * Human-readable ID of this monitor, which needs to be unique within the system.
@@ -97,6 +100,7 @@ public abstract class AdministrativeMonitor extends AbstractModelObject implemen
      * This ID is used to remember persisted setting for this monitor,
      * so the ID should remain consistent beyond the Hudson JVM lifespan.
      */
+    @Exported
     public final String id;
 
     protected AdministrativeMonitor(String id) {
@@ -146,6 +150,7 @@ public void disable(boolean value) throws IOException {
      * This flag implements the ability for the admin to say "no thank you" to the monitor that
      * he wants to ignore.
      */
+    @Exported
     public boolean isEnabled() {
         return !Jenkins.get().getDisabledAdministrativeMonitors().contains(id);
     }
@@ -158,6 +163,7 @@ public boolean isEnabled() {
      * This method is called from the HTML rendering thread,
      * so it should run efficiently.
      */
+    @Exported
     public abstract boolean isActivated();
 
     /**
@@ -167,6 +173,7 @@ public boolean isEnabled() {
      *
      * @since 2.267
      */
+    @Exported
     public boolean isSecurity() {
         return false;
     }

core/src/main/java/jenkins/management/AdministrativeMonitorsApi.java

@@ -1,18 +1,26 @@
 package jenkins.management;
 
 import hudson.Extension;
+import hudson.ExtensionList;
+import hudson.model.AdministrativeMonitor;
+import hudson.model.Api;
 import hudson.model.PageDecorator;
 import hudson.model.RootAction;
 import jakarta.servlet.ServletException;
 import java.io.IOException;
+import java.util.Collection;
+import javax.servlet.ServletException;
 import jenkins.model.Jenkins;
 import org.kohsuke.accmod.Restricted;
 import org.kohsuke.accmod.restrictions.NoExternalUse;
 import org.kohsuke.stapler.StaplerRequest2;
 import org.kohsuke.stapler.StaplerResponse2;
+import org.kohsuke.stapler.export.Exported;
+import org.kohsuke.stapler.export.ExportedBean;
 import org.kohsuke.stapler.verb.GET;
 
 @Extension
+@ExportedBean
 @Restricted(NoExternalUse.class)
 public class AdministrativeMonitorsApi implements RootAction {
     @GET
@@ -39,12 +47,29 @@ public String getDisplayName() {
 
     @Override
     public String getUrlName() {
-        return "administrativeMonitorsApi";
+        return "administrative-monitors";
     }
 
     private AdministrativeMonitorsDecorator getDecorator() {
         return Jenkins.get()
                 .getExtensionList(PageDecorator.class)
                 .get(AdministrativeMonitorsDecorator.class);
     }
+
+    @Exported
+    public Collection<AdministrativeMonitor> getActiveAdministrativeMonitors() {
+        return ExtensionList.lookupSingleton(AdministrativeMonitorsDecorator.class).getAllActiveAdministrativeMonitors();
+    }
+
+    @Exported
+    public Collection<AdministrativeMonitor> getAdministrativeMonitors() {
+        return ExtensionList.lookup(AdministrativeMonitor.class);
+    }
+
+    public Api getApi() {
+        // Implement a permission check so failure to authenticate doesn't look like everything's OK when accessing /api.
+        // This check needs to match AdministrativeMonitorsDecorator#getMonitorsToDisplay.
+        Jenkins.get().checkPermission(Jenkins.SYSTEM_READ);
+        return new Api(this);
+    }
 }

core/src/main/java/jenkins/management/AdministrativeMonitorsDecorator.java

@@ -116,7 +116,7 @@ public List<AdministrativeMonitor> getSecurityAdministrativeMonitors() {
                 .collect(Collectors.toList());
     }
 
-    private Collection<AdministrativeMonitor> getAllActiveAdministrativeMonitors() {
+    protected Collection<AdministrativeMonitor> getAllActiveAdministrativeMonitors() {
         Collection<AdministrativeMonitor> active = new ArrayList<>();
         for (AdministrativeMonitor am : Jenkins.get().getActiveAdministrativeMonitors()) {
             if (am instanceof ReverseProxySetupMonitor) {

core/src/main/resources/jenkins/management/AdministrativeMonitorsDecorator/footer.jelly

@@ -38,7 +38,7 @@ THE SOFTWARE.
                 <a id="visible-am-button"
                    class="am-button"
                    href="#"
-                   data-href="${rootURL}/administrativeMonitorsApi/nonSecurityPopupContent"
+                   data-href="${rootURL}/administrative-monitors/nonSecurityPopupContent"
                    title="${%tooltip(activeNonSecurityAMCount)}">
                     <l:icon src="symbol-notifications" class="icon-md"/>
                     <div class="am-monitor__indicator-mobile"/>
@@ -55,7 +55,7 @@ THE SOFTWARE.
                 <a id="visible-sec-am-button"
                    class="am-button security-am"
                    href="#"
-                   data-href="${rootURL}/administrativeMonitorsApi/securityPopupContent"
+                   data-href="${rootURL}/administrative-monitors/securityPopupContent"
                    title="${%tooltipSec(activeSecurityAMCount)}">
                     <l:icon src="symbol-shield-warning" class="icon-md"/>
                     <div class="am-monitor__indicator-mobile"/>