diff --git a/docker/images/pinot/etc/jmx_prometheus_javaagent/configs/controller.yml b/docker/images/pinot/etc/jmx_prometheus_javaagent/configs/controller.yml
index 908dd95f659b..2281a9ea41e0 100644
--- a/docker/images/pinot/etc/jmx_prometheus_javaagent/configs/controller.yml
+++ b/docker/images/pinot/etc/jmx_prometheus_javaagent/configs/controller.yml
@@ -17,7 +17,7 @@ rules:
     tableType: "$6"
     partition: "$7"
 # Gauges that accept the controller taskType
-- pattern: "\"org\\.apache\\.pinot\\.common\\.metrics\"<type=\"ControllerMetrics\", name=\"pinot\\.controller\\.(numMinionTasksInProgress|numMinionSubtasksRunning|numMinionSubtasksWaiting|numMinionSubtasksError|percentMinionSubtasksInQueue|percentMinionSubtasksInError)\\.(\\w+)\"><>(\\w+)"
+- pattern: "\"org\\.apache\\.pinot\\.common\\.metrics\"<type=\"ControllerMetrics\", name=\"pinot\\.controller\\.(numMinionTasksInProgress|numMinionSubtasksRunning|numMinionSubtasksWaiting|numMinionSubtasksError|numMinionSubtasksUnknown|percentMinionSubtasksInQueue|percentMinionSubtasksInError)\\.(\\w+)\"><>(\\w+)"
   name: "pinot_controller_$1_$3"
   cache: true
   labels:
diff --git a/pinot-common/src/main/java/org/apache/pinot/common/metrics/ControllerGauge.java b/pinot-common/src/main/java/org/apache/pinot/common/metrics/ControllerGauge.java
index cdb99f0f904d..a978219343ec 100644
--- a/pinot-common/src/main/java/org/apache/pinot/common/metrics/ControllerGauge.java
+++ b/pinot-common/src/main/java/org/apache/pinot/common/metrics/ControllerGauge.java
@@ -68,6 +68,7 @@ public enum ControllerGauge implements AbstractMetrics.Gauge {
   NUM_MINION_SUBTASKS_WAITING("NumMinionSubtasksWaiting", true),
   NUM_MINION_SUBTASKS_RUNNING("NumMinionSubtasksRunning", true),
   NUM_MINION_SUBTASKS_ERROR("NumMinionSubtasksError", true),
+  NUM_MINION_SUBTASKS_UNKNOWN("NumMinionSubtasksUnknown", true),
   PERCENT_MINION_SUBTASKS_IN_QUEUE("PercentMinionSubtasksInQueue", true),
   PERCENT_MINION_SUBTASKS_IN_ERROR("PercentMinionSubtasksInError", true),
   TIER_BACKEND_TABLE_COUNT("TierBackendTableCount", true),
diff --git a/pinot-common/src/test/java/org/apache/pinot/common/metrics/prometheus/ControllerPrometheusMetricsTest.java b/pinot-common/src/test/java/org/apache/pinot/common/metrics/prometheus/ControllerPrometheusMetricsTest.java
index 21645d201cbb..1f458a444829 100644
--- a/pinot-common/src/test/java/org/apache/pinot/common/metrics/prometheus/ControllerPrometheusMetricsTest.java
+++ b/pinot-common/src/test/java/org/apache/pinot/common/metrics/prometheus/ControllerPrometheusMetricsTest.java
@@ -40,6 +40,7 @@ public abstract class ControllerPrometheusMetricsTest extends PinotPrometheusMet
   private static final List<ControllerGauge> GLOBAL_GAUGES_ACCEPTING_TASKTYPE =
       List.of(ControllerGauge.NUM_MINION_TASKS_IN_PROGRESS, ControllerGauge.NUM_MINION_SUBTASKS_RUNNING,
           ControllerGauge.NUM_MINION_SUBTASKS_WAITING, ControllerGauge.NUM_MINION_SUBTASKS_ERROR,
+          ControllerGauge.NUM_MINION_SUBTASKS_UNKNOWN,
           ControllerGauge.PERCENT_MINION_SUBTASKS_IN_QUEUE, ControllerGauge.PERCENT_MINION_SUBTASKS_IN_ERROR);
 
   //local gauges that accept partition
diff --git a/pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/minion/TaskMetricsEmitter.java b/pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/minion/TaskMetricsEmitter.java
index 48876dcb30c1..ace369448596 100644
--- a/pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/minion/TaskMetricsEmitter.java
+++ b/pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/minion/TaskMetricsEmitter.java
@@ -114,6 +114,8 @@ protected final void runTask(Properties periodicTaskProperties) {
             taskTypeAccumulatedCount.getWaiting());
         _controllerMetrics.setValueOfGlobalGauge(ControllerGauge.NUM_MINION_SUBTASKS_ERROR, taskType,
             taskTypeAccumulatedCount.getError());
+        _controllerMetrics.setValueOfGlobalGauge(ControllerGauge.NUM_MINION_SUBTASKS_UNKNOWN, taskType,
+            taskTypeAccumulatedCount.getUnknown());
         int total = taskTypeAccumulatedCount.getTotal();
         int percent = total != 0
             ? (taskTypeAccumulatedCount.getWaiting() + taskTypeAccumulatedCount.getRunning()) * 100 / total : 0;
@@ -129,6 +131,8 @@ protected final void runTask(Properties periodicTaskProperties) {
               ControllerGauge.NUM_MINION_SUBTASKS_WAITING, taskCount.getWaiting());
           _controllerMetrics.setOrUpdateTableGauge(tableNameWithType, taskType,
               ControllerGauge.NUM_MINION_SUBTASKS_ERROR, taskCount.getError());
+          _controllerMetrics.setOrUpdateTableGauge(tableNameWithType, taskType,
+              ControllerGauge.NUM_MINION_SUBTASKS_UNKNOWN, taskCount.getUnknown());
           int tableTotal = taskCount.getTotal();
           int tablePercent = tableTotal != 0 ? (taskCount.getWaiting() + taskCount.getRunning()) * 100 / tableTotal : 0;
           _controllerMetrics.setOrUpdateTableGauge(tableNameWithType, taskType,
@@ -163,6 +167,7 @@ protected final void runTask(Properties periodicTaskProperties) {
       _controllerMetrics.removeGlobalGauge(taskType, ControllerGauge.NUM_MINION_SUBTASKS_RUNNING);
       _controllerMetrics.removeGlobalGauge(taskType, ControllerGauge.NUM_MINION_SUBTASKS_WAITING);
       _controllerMetrics.removeGlobalGauge(taskType, ControllerGauge.NUM_MINION_SUBTASKS_ERROR);
+      _controllerMetrics.removeGlobalGauge(taskType, ControllerGauge.NUM_MINION_SUBTASKS_UNKNOWN);
       _controllerMetrics.removeGlobalGauge(taskType, ControllerGauge.PERCENT_MINION_SUBTASKS_IN_QUEUE);
       _controllerMetrics.removeGlobalGauge(taskType, ControllerGauge.PERCENT_MINION_SUBTASKS_IN_ERROR);
       // remove table task type level gauges
@@ -192,6 +197,7 @@ private void removeTableTaskTypeMetrics(Set<String> tableNameWithTypeSet, String
       _controllerMetrics.removeTableGauge(tableNameWithType, taskType, ControllerGauge.NUM_MINION_SUBTASKS_RUNNING);
       _controllerMetrics.removeTableGauge(tableNameWithType, taskType, ControllerGauge.NUM_MINION_SUBTASKS_WAITING);
       _controllerMetrics.removeTableGauge(tableNameWithType, taskType, ControllerGauge.NUM_MINION_SUBTASKS_ERROR);
+      _controllerMetrics.removeTableGauge(tableNameWithType, taskType, ControllerGauge.NUM_MINION_SUBTASKS_UNKNOWN);
       _controllerMetrics.removeTableGauge(tableNameWithType, taskType,
           ControllerGauge.PERCENT_MINION_SUBTASKS_IN_QUEUE);
       _controllerMetrics.removeTableGauge(tableNameWithType, taskType,
diff --git a/pinot-controller/src/test/java/org/apache/pinot/controller/helix/core/minion/TaskMetricsEmitterTest.java b/pinot-controller/src/test/java/org/apache/pinot/controller/helix/core/minion/TaskMetricsEmitterTest.java
index 6fcb708c7177..bd88f2731cef 100644
--- a/pinot-controller/src/test/java/org/apache/pinot/controller/helix/core/minion/TaskMetricsEmitterTest.java
+++ b/pinot-controller/src/test/java/org/apache/pinot/controller/helix/core/minion/TaskMetricsEmitterTest.java
@@ -84,7 +84,7 @@ public void taskType1ButNoInProgressTask() {
     Mockito.when(_pinotHelixTaskResourceManager.getTasksInProgress(taskType)).thenReturn(ImmutableSet.of());
     _taskMetricsEmitter.runTask(null);
 
-    Assert.assertEquals(metricsRegistry.allMetrics().size(), 7);
+    Assert.assertEquals(metricsRegistry.allMetrics().size(), 8);
     Assert.assertTrue(metricsRegistry.allMetrics().containsKey(
         new YammerMetricName(ControllerMetrics.class, "pinot.controller.onlineMinionInstances")));
     Assert.assertEquals(((YammerSettableGauge<?>) metricsRegistry.allMetrics().get(
@@ -144,7 +144,7 @@ public void taskType1WithTwoTablesEmitMetricTwice() {
   private void runAndAssertForTaskType1WithTwoTables() {
     PinotMetricsRegistry metricsRegistry = _controllerMetrics.getMetricsRegistry();
     _taskMetricsEmitter.runTask(null);
-    Assert.assertEquals(metricsRegistry.allMetrics().size(), 17);
+    Assert.assertEquals(metricsRegistry.allMetrics().size(), 20);
 
     Assert.assertTrue(metricsRegistry.allMetrics().containsKey(
         new YammerMetricName(ControllerMetrics.class, "pinot.controller.onlineMinionInstances")));
@@ -231,7 +231,7 @@ private void oneTaskTypeWithOneTable(String taskType, String taskName1, String t
 
     PinotMetricsRegistry metricsRegistry = _controllerMetrics.getMetricsRegistry();
     _taskMetricsEmitter.runTask(null);
-    Assert.assertEquals(metricsRegistry.allMetrics().size(), 12);
+    Assert.assertEquals(metricsRegistry.allMetrics().size(), 14);
 
     Assert.assertTrue(metricsRegistry.allMetrics().containsKey(
         new YammerMetricName(ControllerMetrics.class, "pinot.controller.onlineMinionInstances")));