feat: support config event and monitor address list.

Author: fishtailfu

polaris-plugins/polaris-plugins-observability/event-pushgateway/src/main/java/com/tencent/polaris/plugins/event/pushgateway/PushGatewayEventReporter.java

@@ -170,6 +170,9 @@ private URI getEventUri() {
     }
 
     private URI getEventUriByNode(Node node) {
+        if (LOG.isDebugEnabled()) {
+            LOG.debug("[PushGatewayEventReporter] choose node: {}", node.getHostPort());
+        }
         if (node != null) {
             // First try to get URI from cache.
             URI cachedUri = eventUriMap.get(node);

polaris-plugins/polaris-plugins-observability/stat-prometheus/src/main/java/com/tencent/polaris/plugins/stat/prometheus/plugin/PrometheusReporter.java

@@ -312,6 +312,9 @@ private void startSchedulePushTask() {
 
     private void doPush() {
         String address = serviceAddressRepository.getServiceAddress();
+        if (LOGGER.isDebugEnabled()) {
+            LOGGER.debug("[PrometheusReporter] send push request to :" + address);
+        }
         try {
             CommonHandler.putDataFromContainerInOrder(sampleMapping, container.getInsCollector(),
                     container.getInsCollector().getCurrentRevision(),

polaris-plugins/polaris-plugins-observability/stat-prometheus/src/test/java/com/tencent/polaris/plugins/stat/prometheus/plugin/PrometheusReporterTest.java

@@ -63,7 +63,7 @@ public void setUp() {
         PrometheusHandlerConfig config = new PrometheusHandlerConfig();
         config.setType("push");
         config.setPushInterval(pushInterval);
-        config.setAddress(PUSH_DEFAULT_ADDRESS);
+        config.setAddress(Collections.singletonList(PUSH_DEFAULT_ADDRESS));
         MockPushGateway pgw = new MockPushGateway(PUSH_DEFAULT_ADDRESS);
         handler = new PrometheusReporter();
         handler.setEnable(true);