diff --git a/nifi-nar-bundles/nifi-prometheus-bundle/nifi-prometheus-reporting-task/src/main/java/org/apache/nifi/reporting/prometheus/api/PrometheusMetricsUtil.java b/nifi-nar-bundles/nifi-prometheus-bundle/nifi-prometheus-reporting-task/src/main/java/org/apache/nifi/reporting/prometheus/api/PrometheusMetricsUtil.java
index 91a54a0..33222c7 100644
--- a/nifi-nar-bundles/nifi-prometheus-bundle/nifi-prometheus-reporting-task/src/main/java/org/apache/nifi/reporting/prometheus/api/PrometheusMetricsUtil.java
+++ b/nifi-nar-bundles/nifi-prometheus-bundle/nifi-prometheus-reporting-task/src/main/java/org/apache/nifi/reporting/prometheus/api/PrometheusMetricsUtil.java
@@ -329,16 +329,18 @@
         final String componentId = status.getId();
         final String componentName = status.getName();
 
-        // Clear all collectors to deal with removed/renamed components
-        try {
-            for (final Field field : PrometheusMetricsUtil.class.getDeclaredFields()) {
-                if (Modifier.isStatic(field.getModifiers()) && (field.get(null) instanceof SimpleCollector)) {
-                    SimpleCollector sc = (SimpleCollector)(field.get(null));
-                    sc.clear();
+        // Clear all collectors to deal with removed/renamed components -- for root PG only
+        if("RootProcessGroup".equals(componentType)) {
+            try {
+                for (final Field field : PrometheusMetricsUtil.class.getDeclaredFields()) {
+                    if (Modifier.isStatic(field.getModifiers()) && (field.get(null) instanceof SimpleCollector)) {
+                        SimpleCollector<?> sc = (SimpleCollector<?>) (field.get(null));
+                        sc.clear();
+                    }
                 }
+            } catch (IllegalAccessException e) {
+                // ignore
             }
-        } catch (IllegalAccessException e) {
-            // ignore
         }
 
         AMOUNT_FLOWFILES_SENT.labels(instanceId, componentType, componentName, componentId, parentPGId).set(status.getFlowFilesSent());
@@ -372,7 +374,7 @@
 
         // Report metrics for child process groups if specified
         if (METRICS_STRATEGY_PG.getValue().equals(metricsStrategy) || METRICS_STRATEGY_COMPONENTS.getValue().equals(metricsStrategy)) {
-            status.getProcessGroupStatus().forEach((childGroupStatus) -> createNifiMetrics(childGroupStatus, instanceId, parentPGId, "ProcessGroup", metricsStrategy));
+            status.getProcessGroupStatus().forEach((childGroupStatus) -> createNifiMetrics(childGroupStatus, instanceId, componentId, "ProcessGroup", metricsStrategy));
         }
 
         if (METRICS_STRATEGY_COMPONENTS.getValue().equals(metricsStrategy)) {
diff --git a/nifi-nar-bundles/nifi-prometheus-bundle/nifi-prometheus-reporting-task/src/test/java/org/apache/nifi/reporting/prometheus/TestPrometheusReportingTask.java b/nifi-nar-bundles/nifi-prometheus-bundle/nifi-prometheus-reporting-task/src/test/java/org/apache/nifi/reporting/prometheus/TestPrometheusReportingTask.java
index b39d757..0943e0b 100644
--- a/nifi-nar-bundles/nifi-prometheus-bundle/nifi-prometheus-reporting-task/src/test/java/org/apache/nifi/reporting/prometheus/TestPrometheusReportingTask.java
+++ b/nifi-nar-bundles/nifi-prometheus-bundle/nifi-prometheus-reporting-task/src/test/java/org/apache/nifi/reporting/prometheus/TestPrometheusReportingTask.java
@@ -19,6 +19,8 @@
 import java.io.IOException;
 import java.net.HttpURLConnection;
 import java.net.URL;
+import java.util.ArrayList;
+import java.util.Collection;
 import java.util.Collections;
 
 import org.apache.http.HttpEntity;
@@ -93,6 +95,28 @@
         outputPortStatus.setActiveThreadCount(1);
 
         rootGroupStatus.setOutputPortStatus(Collections.singletonList(outputPortStatus));
+        // Create a nested group status
+        ProcessGroupStatus groupStatus2 = new ProcessGroupStatus();
+        groupStatus2.setFlowFilesReceived(5);
+        groupStatus2.setBytesReceived(10000);
+        groupStatus2.setFlowFilesSent(10);
+        groupStatus2.setBytesSent(20000);
+        groupStatus2.setQueuedCount(100);
+        groupStatus2.setQueuedContentSize(1024L);
+        groupStatus2.setActiveThreadCount(2);
+        groupStatus2.setBytesRead(12345L);
+        groupStatus2.setBytesWritten(11111L);
+        groupStatus2.setFlowFilesTransferred(5);
+        groupStatus2.setBytesTransferred(10000);
+        groupStatus2.setOutputContentSize(1000L);
+        groupStatus2.setInputContentSize(1000L);
+        groupStatus2.setOutputCount(100);
+        groupStatus2.setInputCount(1000);
+        groupStatus2.setId("3378");
+        groupStatus2.setName("nestedPG");
+        Collection<ProcessGroupStatus> nestedGroupStatuses = new ArrayList<>();
+        nestedGroupStatuses.add(groupStatus2);
+        rootGroupStatus.setProcessGroupStatus(nestedGroupStatuses);
     }
 
     @Test
@@ -107,6 +131,8 @@
                 "nifi_amount_flowfiles_received{instance=\"localhost\",component_type=\"RootProcessGroup\",component_name=\"root\",component_id=\"1234\",parent_id=\"\",} 5.0"));
         Assert.assertTrue(content.contains(
                 "nifi_amount_threads_active{instance=\"localhost\",component_type=\"RootProcessGroup\",component_name=\"root\",component_id=\"1234\",parent_id=\"\",} 5.0"));
+        Assert.assertTrue(content.contains(
+                "nifi_amount_threads_active{instance=\"localhost\",component_type=\"ProcessGroup\",component_name=\"nestedPG\",component_id=\"3378\",parent_id=\"1234\",} 2.0"));
 
         // Rename the component
         rootGroupStatus.setName("rootroot");