diff --git a/docs/monitoring.md b/docs/monitoring.md
index 5679ef548a5..39ab314ea57 100644
--- a/docs/monitoring.md
+++ b/docs/monitoring.md
@@ -235,6 +235,7 @@ These metrics are exposed by Celeborn worker.
     | CommitFilesFailCount                   | The count of commit files request failed in current worker.                                                     |
     | SlotsAllocated                         | Slots allocated in last hour.                                                                                   |
     | ActiveSlotsCount                       | The number of slots currently being used in a worker.                                                           |
+    | AvailableSlotsCount                    | The number of slots currently available in a worker.                                                            |
     | ReserveSlotsTime                       | ReserveSlots means acquire a disk buffer and record partition location.                                         |
     | ActiveConnectionCount                  | The count of active network connection.                                                                         |
     | NettyMemory                            | The total amount of off-heap memory used by celeborn worker.                                                    |
diff --git a/worker/src/main/scala/org/apache/celeborn/service/deploy/worker/Worker.scala b/worker/src/main/scala/org/apache/celeborn/service/deploy/worker/Worker.scala
index 1c5bc201803..61e8067f565 100644
--- a/worker/src/main/scala/org/apache/celeborn/service/deploy/worker/Worker.scala
+++ b/worker/src/main/scala/org/apache/celeborn/service/deploy/worker/Worker.scala
@@ -465,6 +465,9 @@ private[celeborn] class Worker(
   workerSource.addGauge(WorkerSource.ACTIVE_SLOTS_COUNT) { () =>
     workerInfo.usedSlots()
   }
+  workerSource.addGauge(WorkerSource.AVAILABLE_SLOTS_COUNT) { () =>
+    workerInfo.totalAvailableSlots()
+  }
   workerSource.addGauge(WorkerSource.IS_DECOMMISSIONING_WORKER) { () =>
     if (shutdown.get() && (workerStatusManager.currentWorkerStatus.getState == State.InDecommission ||
         workerStatusManager.currentWorkerStatus.getState == State.InDecommissionThenIdle)) {
diff --git a/worker/src/main/scala/org/apache/celeborn/service/deploy/worker/WorkerSource.scala b/worker/src/main/scala/org/apache/celeborn/service/deploy/worker/WorkerSource.scala
index f9385805146..b70d8860ee7 100644
--- a/worker/src/main/scala/org/apache/celeborn/service/deploy/worker/WorkerSource.scala
+++ b/worker/src/main/scala/org/apache/celeborn/service/deploy/worker/WorkerSource.scala
@@ -238,6 +238,7 @@ object WorkerSource {
   // slots
   val SLOTS_ALLOCATED = "SlotsAllocated"
   val ACTIVE_SLOTS_COUNT = "ActiveSlotsCount"
+  val AVAILABLE_SLOTS_COUNT = "AvailableSlotsCount"
   val RESERVE_SLOTS_TIME = "ReserveSlotsTime"
 
   // connection