diff --git a/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/deploy/DefaultApplicationDeployer.java b/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/deploy/DefaultApplicationDeployer.java
index 047a093c55..4220ba5fec 100644
--- a/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/deploy/DefaultApplicationDeployer.java
+++ b/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/deploy/DefaultApplicationDeployer.java
@@ -363,18 +363,33 @@ public class DefaultApplicationDeployer extends AbstractDeployer<ApplicationMode
     private void initMetricsReporter() {
         DefaultMetricsCollector collector =
             applicationModel.getBeanFactory().getBean(DefaultMetricsCollector.class);
-        MetricsConfig metricsConfig = configManager.getMetrics().orElse(null);
+        Optional<MetricsConfig> configOptional = configManager.getMetrics();
+
         // TODO compatible with old usage of metrics, remove protocol check after new metrics is ready for use.
-        if (metricsConfig != null && PROTOCOL_PROMETHEUS.equals(metricsConfig.getProtocol())) {
-            collector.setCollectEnabled(true);
-            collector.collectApplication(applicationModel);
-            collector.setThreadpoolCollectEnabled(Optional.ofNullable(metricsConfig.getEnableThreadpoolMetrics()).orElse(true));
-            String protocol = metricsConfig.getProtocol();
-            MetricsReporterFactory metricsReporterFactory = getExtensionLoader(MetricsReporterFactory.class).getAdaptiveExtension();
-            MetricsReporter metricsReporter = metricsReporterFactory.createMetricsReporter(metricsConfig.toUrl());
-            metricsReporter.init();
-            applicationModel.getBeanFactory().registerBean(metricsReporter);
+        boolean importMetricsPrometheus;  // Use package references instead of config checks
+        try {
+            Class.forName("io.micrometer.prometheus.PrometheusConfig");
+            importMetricsPrometheus = true;
+        } catch (ClassNotFoundException e) {
+            importMetricsPrometheus = false;
         }
+
+        if (!importMetricsPrometheus) {
+            //use old metrics
+            return;
+        }
+
+        MetricsConfig metricsConfig = configOptional.orElse(new MetricsConfig(applicationModel));
+        if (StringUtils.isBlank(metricsConfig.getProtocol())) {
+            metricsConfig.setProtocol(PROTOCOL_PROMETHEUS);
+        }
+        collector.setCollectEnabled(true);
+        collector.collectApplication(applicationModel);
+        collector.setThreadpoolCollectEnabled(Optional.ofNullable(metricsConfig.getEnableThreadpoolMetrics()).orElse(true));
+        MetricsReporterFactory metricsReporterFactory = getExtensionLoader(MetricsReporterFactory.class).getAdaptiveExtension();
+        MetricsReporter metricsReporter = metricsReporterFactory.createMetricsReporter(metricsConfig.toUrl());
+        metricsReporter.init();
+        applicationModel.getBeanFactory().registerBean(metricsReporter);
     }
 
 
@@ -1122,7 +1137,7 @@ public class DefaultApplicationDeployer extends AbstractDeployer<ApplicationMode
 
     private void startMetricsCollector() {
         DefaultMetricsCollector collector = applicationModel.getBeanFactory().getBean(DefaultMetricsCollector.class);
-        if(Objects.nonNull(collector) && collector.isThreadpoolCollectEnabled()) {
+        if (Objects.nonNull(collector) && collector.isThreadpoolCollectEnabled()) {
             collector.registryDefaultSample();
         }
     }
diff --git a/dubbo-metrics/dubbo-metrics-default/src/main/java/org/apache/dubbo/metrics/collector/AggregateMetricsCollector.java b/dubbo-metrics/dubbo-metrics-default/src/main/java/org/apache/dubbo/metrics/collector/AggregateMetricsCollector.java
index 513420a9b1..0207a06941 100644
--- a/dubbo-metrics/dubbo-metrics-default/src/main/java/org/apache/dubbo/metrics/collector/AggregateMetricsCollector.java
+++ b/dubbo-metrics/dubbo-metrics-default/src/main/java/org/apache/dubbo/metrics/collector/AggregateMetricsCollector.java
@@ -66,7 +66,7 @@ public class AggregateMetricsCollector implements MetricsCollector, MetricsListe
         this.applicationModel = applicationModel;
         ConfigManager configManager = applicationModel.getApplicationConfigManager();
         MetricsConfig config = configManager.getMetrics().orElse(null);
-        if (config != null && config.getAggregation() != null && Boolean.TRUE.equals(config.getAggregation().getEnabled())) {
+        if (config != null && config.getAggregation() != null && (config.getAggregation().getEnabled() == null || Boolean.TRUE.equals(config.getAggregation().getEnabled()))) {
             // only registered when aggregation is enabled.
             registerListener();
 
@@ -94,7 +94,7 @@ public class AggregateMetricsCollector implements MetricsCollector, MetricsListe
 
 
     private void onRequestEvent(MethodEvent event) {
-        MethodMetric metric =  event.getMethodMetric();
+        MethodMetric metric = event.getMethodMetric();
 
         String type = event.getType();