Add route to status API /debugging/config/dump in the UI (#13266)

Author: kezhenxu94

apm-webapp/src/main/java/org/apache/skywalking/oap/server/webapp/ApplicationStartUp.java

@@ -68,6 +68,9 @@ public static void main(String[] args) throws Exception {
             .builder()
             .port(port, SessionProtocol.HTTP)
             .service("/graphql", new OapProxyService(oapServices))
+            .service("/debugging/config/dump", new OapProxyService(oapServices))
+            .service("/status/config/ttl", new OapProxyService(oapServices))
+            .service("/status/cluster/nodes", new OapProxyService(oapServices))
             .service("/internal/l7check", HealthCheckService.of())
             .service("/zipkin/config.json", zipkin)
             .serviceUnder("/zipkin/api", zipkin)

apm-webapp/src/main/java/org/apache/skywalking/oap/server/webapp/OapProxyService.java

@@ -76,4 +76,9 @@ private static WebClient newLoadBalancingClient(EndpointGroup oapGroup) {
     protected HttpResponse doPost(ServiceRequestContext ctx, HttpRequest req) throws Exception {
         return loadBalancingClient.execute(req);
     }
+
+    @Override
+    protected HttpResponse doGet(ServiceRequestContext ctx, HttpRequest req) throws Exception {
+        return loadBalancingClient.execute(req);
+    }
 }

docs/en/changes/changes.md

@@ -29,6 +29,7 @@
 * Fix: correct the same labels for metrics.
 * Refactor: use the Fetch API to instead of Axios.
 * Support cold stage data for metrics, trace and log.
+* Add route to status API `/debugging/config/dump` in the UI.
 
 #### Documentation